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<a name="Default-hooks"></a>
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Next: <a href="General-Index.html#General-Index" accesskey="n" rel="next">General Index</a>, Previous: <a href="Special-Topics.html#Special-Topics" accesskey="p" rel="prev">Special Topics</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="General-Index.html#General-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Default-hooks-1"></a>
<h2 class="appendix">Appendix A Default hooks</h2>

<p>This section contains the entire source code of the standard hook file,
that is built in to the monotone executable, and read before any user
hooks files (unless <samp>--no-builtin-rcfiles</samp> is passed).  It contains the
default values for all hooks. See <a href="Lua-Reference.html#rcfiles">rcfiles</a>.
</p>
<pre class="verbatim">-- Copyright (C) 2003 Graydon Hoare &lt;graydon@pobox.com&gt;
--
-- This program is made available under the GNU GPL version 2.0 or
-- greater. See the accompanying file COPYING for details.
--
-- This program is distributed WITHOUT ANY WARRANTY; without even the
-- implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
-- PURPOSE.

-- this is the standard set of lua hooks for monotone;
-- user-provided files can override it or add to it.

-- Since Lua 5.2, unpack and loadstrings are deprecated and are either moved
-- to table.unpack() or replaced by load(). If lua was compiled without
-- LUA_COMPAT_UNPACK and/or LUA_COMPAT_LOADSTRING, these two are not
-- available and we add a similar compatibility layer, ourselves.
unpack = unpack or table.unpack
loadstring = loadstring or load

function temp_file(namehint, filemodehint)
   local tdir
   tdir = os.getenv(&quot;TMPDIR&quot;)
   if tdir == nil then tdir = os.getenv(&quot;TMP&quot;) end
   if tdir == nil then tdir = os.getenv(&quot;TEMP&quot;) end
   if tdir == nil then tdir = &quot;/tmp&quot; end
   local filename
   if namehint == nil then
      filename = string.format(&quot;%s/mtn.XXXXXX&quot;, tdir)
   else
      filename = string.format(&quot;%s/mtn.%s.XXXXXX&quot;, tdir, namehint)
   end
   local filemode
   if filemodehint == nil then
      filemode = &quot;r+&quot;
   else
      filemode = filemodehint
   end
   local name = mkstemp(filename)
   local file = io.open(name, filemode)
   return file, name
end

function execute(path, ...)
   local pid
   local ret = -1
   pid = spawn(path, ...)
   if (pid ~= -1) then ret, pid = wait(pid) end
   return ret
end

function execute_redirected(stdin, stdout, stderr, path, ...)
   local pid
   local ret = -1
   io.flush();
   pid = spawn_redirected(stdin, stdout, stderr, path, ...)
   if (pid ~= -1) then ret, pid = wait(pid) end
   return ret
end

-- Wrapper around execute to let user confirm in the case where a subprocess
-- returns immediately
-- This is needed to work around some brokenness with some merge tools
-- (e.g. on OS X)
function execute_confirm(path, ...)
   ret = execute(path, ...)

   if (ret ~= 0)
   then
      print(gettext(&quot;Press enter&quot;))
   else
      print(gettext(&quot;Press enter when the subprocess has completed&quot;))
   end
   io.read()
   return ret
end

-- attributes are persistent metadata about files (such as execute
-- bit, ACLs, various special flags) which we want to have set and
-- re-set any time the files are modified. the attributes themselves
-- are stored in the roster associated with the revision. each (f,k,v)
-- attribute triple turns into a call to attr_functions[k](f,v) in lua.

if (attr_init_functions == nil) then
   attr_init_functions = {}
end

attr_init_functions[&quot;mtn:execute&quot;] =
   function(filename)
      if (is_executable(filename)) then
        return &quot;true&quot;
      else
        return nil
      end
   end

attr_init_functions[&quot;mtn:manual_merge&quot;] =
   function(filename)
      if (binary_file(filename)) then
        return &quot;true&quot; -- binary files must be merged manually
      else
        return nil
      end
   end

if (attr_functions == nil) then
   attr_functions = {}
end

attr_functions[&quot;mtn:execute&quot;] =
   function(filename, value)
      if (value == &quot;true&quot;) then
         set_executable(filename)
      else
         clear_executable(filename)
      end
   end

function dir_matches(name, dir)
   -- helper for ignore_file, matching files within dir, or dir itself.
   -- eg for dir of 'CVS', matches CVS/, CVS/*, */CVS/ and */CVS/*
   if (string.find(name, &quot;^&quot; .. dir .. &quot;/&quot;)) then return true end
   if (string.find(name, &quot;^&quot; .. dir .. &quot;$&quot;)) then return true end
   if (string.find(name, &quot;/&quot; .. dir .. &quot;/&quot;)) then return true end
   if (string.find(name, &quot;/&quot; .. dir .. &quot;$&quot;)) then return true end
   return false
end

function portable_readline(f)
    line = f:read()
    if line ~= nil then
        line = string.gsub(line, &quot;\r$&quot;,&quot;&quot;) -- strip possible \r left from windows editing
    end
    return line
end

function ignore_file(name)
   -- project specific
   if (ignored_files == nil) then
      ignored_files = {}
      local ignfile = io.open(&quot;.mtn-ignore&quot;, &quot;r&quot;)
      if (ignfile ~= nil) then
         local line = portable_readline(ignfile)
         while (line ~= nil) do
            if line ~= &quot;&quot; then
                table.insert(ignored_files, line)
            end
            line = portable_readline(ignfile)
         end
         io.close(ignfile)
      end
   end

   local warn_reported_file = false
   for i, line in pairs(ignored_files)
   do
      if (line ~= nil) then
         local pcallstatus, result = pcall(function()
        return regex.search(line, name)
     end)
         if pcallstatus == true then
            -- no error from the regex.search call
            if result == true then return true end
         else
            -- regex.search had a problem, warn the user their
            -- .mtn-ignore file syntax is wrong
        if not warn_reported_file then
           io.stderr:write(&quot;mtn: warning: while matching file '&quot;
                       .. name .. &quot;':\n&quot;)
           warn_reported_file = true
        end
        local prefix = &quot;.mtn-ignore:&quot; .. i .. &quot;: warning: &quot;
            io.stderr:write(prefix
                            .. string.gsub(result, &quot;\n&quot;, &quot;\n&quot; .. prefix)
                               .. &quot;\n\t- skipping this regex for &quot;
                               .. &quot;all remaining files.\n&quot;)
            ignored_files[i] = nil
         end
      end
   end

   local file_pats = {
      -- c/c++
      &quot;%.a$&quot;, &quot;%.so$&quot;, &quot;%.o$&quot;, &quot;%.la$&quot;, &quot;%.lo$&quot;, &quot;^core$&quot;,
      &quot;/core$&quot;, &quot;/core%.%d+$&quot;,
      -- java
      &quot;%.class$&quot;,
      -- python
      &quot;%.pyc$&quot;, &quot;%.pyo$&quot;,
      -- gettext
      &quot;%.g?mo$&quot;,
      -- intltool
      &quot;%.intltool%-merge%-cache$&quot;,
      -- TeX
      &quot;%.aux$&quot;,
      -- backup files
      &quot;%.bak$&quot;, &quot;%.orig$&quot;, &quot;%.rej$&quot;, &quot;%~$&quot;,
      -- vim creates .foo.swp files
      &quot;%.[^/]*%.swp$&quot;,
      -- emacs creates #foo# files
      &quot;%#[^/]*%#$&quot;,
      -- other VCSes (where metadata is stored in named files):
      &quot;%.scc$&quot;,
      -- desktop/directory configuration metadata
      &quot;^%.DS_Store$&quot;, &quot;/%.DS_Store$&quot;, &quot;^desktop%.ini$&quot;, &quot;/desktop%.ini$&quot;
   }

   local dir_pats = {
      -- autotools detritus:
      &quot;autom4te%.cache&quot;, &quot;%.deps&quot;, &quot;%.libs&quot;,
      -- Cons/SCons detritus:
      &quot;%.consign&quot;, &quot;%.sconsign&quot;,
      -- other VCSes (where metadata is stored in named dirs):
      &quot;CVS&quot;, &quot;%.svn&quot;, &quot;SCCS&quot;, &quot;_darcs&quot;, &quot;%.cdv&quot;, &quot;%.git&quot;, &quot;%.bzr&quot;, &quot;%.hg&quot;
   }

   for _, pat in ipairs(file_pats) do
      if string.find(name, pat) then return true end
   end
   for _, pat in ipairs(dir_pats) do
      if dir_matches(name, pat) then return true end
   end

   return false;
end

-- return true means &quot;binary&quot;, false means &quot;text&quot;,
-- nil means &quot;unknown, try to guess&quot;
function binary_file(name)
   -- some known binaries, return true
   local bin_pats = {
      &quot;%.gif$&quot;, &quot;%.jpe?g$&quot;, &quot;%.png$&quot;, &quot;%.bz2$&quot;, &quot;%.gz$&quot;, &quot;%.zip$&quot;,
      &quot;%.class$&quot;, &quot;%.jar$&quot;, &quot;%.war$&quot;, &quot;%.ear$&quot;
   }

   -- some known text, return false
   local txt_pats = {
      &quot;%.cc?$&quot;, &quot;%.cxx$&quot;, &quot;%.hh?$&quot;, &quot;%.hxx$&quot;, &quot;%.cpp$&quot;, &quot;%.hpp$&quot;,
      &quot;%.lua$&quot;, &quot;%.texi$&quot;, &quot;%.sql$&quot;, &quot;%.java$&quot;
   }

   local lowname=string.lower(name)
   for _, pat in ipairs(bin_pats) do
      if string.find(lowname, pat) then return true end
   end
   for _, pat in ipairs(txt_pats) do
      if string.find(lowname, pat) then return false end
   end

   -- unknown - read file and use the guess-binary
   -- monotone built-in function
   return guess_binary_file_contents(name)
end

-- given a file name, return a regular expression which will match
-- lines that name top-level constructs in that file, or &quot;&quot;, to disable
-- matching.
function get_encloser_pattern(name)
   -- texinfo has special sectioning commands
   if (string.find(name, &quot;%.texi$&quot;)) then
      -- sectioning commands in texinfo: @node, @chapter, @top,
      -- @((sub)?sub)?section, @unnumbered(((sub)?sub)?sec)?,
      -- @appendix(((sub)?sub)?sec)?, @(|major|chap|sub(sub)?)heading
      return (&quot;^@(&quot;
              .. &quot;node|chapter|top&quot;
              .. &quot;|((sub)?sub)?section&quot;
              .. &quot;|(unnumbered|appendix)(((sub)?sub)?sec)?&quot;
              .. &quot;|(major|chap|sub(sub)?)?heading&quot;
              .. &quot;)&quot;)
   end
   -- LaTeX has special sectioning commands.  This rule is applied to ordinary
   -- .tex files too, since there's no reliable way to distinguish those from
   -- latex files anyway, and there's no good pattern we could use for
   -- arbitrary plain TeX anyway.
   if (string.find(name, &quot;%.tex$&quot;)
       or string.find(name, &quot;%.ltx$&quot;)
       or string.find(name, &quot;%.latex$&quot;)) then
      return (&quot;\\\\(&quot;
              .. &quot;part|chapter|paragraph|subparagraph&quot;
              .. &quot;|((sub)?sub)?section&quot;
              .. &quot;)&quot;)
   end
   -- There's no good way to find section headings in raw text, and trying
   -- just gives distracting output, so don't even try.
   if (string.find(name, &quot;%.txt$&quot;)
       or string.upper(name) == &quot;README&quot;) then
      return &quot;&quot;
   end
   -- This default is correct surprisingly often -- in pretty much any text
   -- written with code-like indentation.
   return &quot;^[[:alnum:]$_]&quot;
end

function edit_comment(user_log_message)
   local exe = nil

   -- top priority is VISUAL, then EDITOR, then a series of hardcoded
   -- defaults, if available.

   local visual = os.getenv(&quot;VISUAL&quot;)
   local editor = os.getenv(&quot;EDITOR&quot;)
   if (visual ~= nil) then exe = visual
   elseif (editor ~= nil) then exe = editor
   elseif (program_exists_in_path(&quot;editor&quot;)) then exe = &quot;editor&quot;
   elseif (program_exists_in_path(&quot;vi&quot;)) then exe = &quot;vi&quot;
   elseif (string.sub(get_ostype(), 1, 6) ~= &quot;CYGWIN&quot; and
       program_exists_in_path(&quot;notepad.exe&quot;)) then exe = &quot;notepad&quot;
   else
      io.write(gettext(&quot;Could not find editor to enter commit message\n&quot;
               .. &quot;Try setting the environment variable EDITOR\n&quot;))
      return nil
   end

   local tmp, tname = temp_file()
   if (tmp == nil) then return nil end
   tmp:write(user_log_message)
   if user_log_message == &quot;&quot; or string.sub(user_log_message, -1) ~= &quot;\n&quot; then
      tmp:write(&quot;\n&quot;)
   end
   io.close(tmp)

   -- By historical convention, VISUAL and EDITOR can contain arguments
   -- (and, in fact, arbitrarily complicated shell constructs).  Since Lua
   -- has no word-splitting functionality, we invoke the shell to deal with
   -- anything more complicated than a single word with no metacharacters.
   -- This, unfortunately, means we have to quote the file argument.

   if (not string.find(exe, &quot;[^%w_.+-]&quot;)) then
      -- safe to call spawn directly
      if (execute(exe, tname) ~= 0) then
         io.write(string.format(gettext(&quot;Error running editor '%s' &quot;..
                                        &quot;to enter log message\n&quot;),
                                exe))
         os.remove(tname)
         return nil
      end
   else
      -- must use shell
      local shell = os.getenv(&quot;SHELL&quot;)
      if (shell == nil) then shell = &quot;sh&quot; end
      if (not program_exists_in_path(shell)) then
         io.write(string.format(gettext(&quot;Editor command '%s' needs a shell, &quot;..
                                        &quot;but '%s' is not to be found&quot;),
                                exe, shell))
         os.remove(tname)
         return nil
      end

      -- Single-quoted strings in both Bourne shell and csh can contain
      -- anything but a single quote.
      local safe_tname = &quot; '&quot; .. string.gsub(tname, &quot;'&quot;, &quot;'\\''&quot;) .. &quot;'&quot;

      if (execute(shell, &quot;-c&quot;, editor .. safe_tname) ~= 0) then
         io.write(string.format(gettext(&quot;Error running editor '%s' &quot;..
                                        &quot;to enter log message\n&quot;),
                                exe))
         os.remove(tname)
         return nil
      end
   end

   tmp = io.open(tname, &quot;r&quot;)
   if (tmp == nil) then os.remove(tname); return nil end
   local res = tmp:read(&quot;*a&quot;)
   io.close(tmp)
   os.remove(tname)
   return res
end


function get_local_key_name(key_identity)
   return key_identity.given_name
end


function persist_phrase_ok()
   return true
end


function use_inodeprints()
   return false
end

function get_date_format_spec(wanted)
   -- Return the strftime(3) specification to be used to print dates
   -- in human-readable format after conversion to the local timezone.
   -- The default uses the preferred date and time representation for
   -- the current locale, e.g. the output looks like this: &quot;09/08/2009
   -- 06:49:26 PM&quot; for en_US and &quot;date_time_long&quot;, or &quot;08.09.2009&quot;
   -- for de_DE and &quot;date_short&quot;
   --
   -- A sampling of other possible formats you might want:
   --   default for your locale: &quot;%c&quot; (may include a confusing timezone label)
   --   12 hour format: &quot;%d %b %Y, %I:%M:%S %p&quot;
   --   like ctime(3):  &quot;%a %b %d %H:%M:%S %Y&quot;
   --   email style:    &quot;%a, %d %b %Y %H:%M:%S&quot;
   --   ISO 8601:       &quot;%Y-%m-%d %H:%M:%S&quot; or &quot;%Y-%m-%dT%H:%M:%S&quot;
   --
   --   ISO 8601, no timezone conversion: &quot;&quot;
   --.
   if (wanted == &quot;date_long&quot; or wanted == &quot;date_short&quot;) then
       return &quot;%x&quot;
   end
   if (wanted == &quot;time_long&quot; or wanted == &quot;time_short&quot;) then
       return &quot;%X&quot;
   end
   return &quot;%x %X&quot;
end

-- trust evaluation hooks

function intersection(a,b)
   local s={}
   local t={}
   for k,v in pairs(a) do s[v.name] = 1 end
   for k,v in pairs(b) do if s[v] ~= nil then table.insert(t,v) end end
   return t
end

function get_revision_cert_trust(signers, id, name, val)
   return true
end

-- This is only used by migration from old manifest-style ancestry
function get_manifest_cert_trust(signers, id, name, val)
   return true
end

-- http://snippets.luacode.org/?p=snippets/String_to_Hex_String_68
function hex_dump(str,spacer)
   return (string.gsub(str,&quot;(.)&quot;,
      function (c)
         return string.format(&quot;%02x%s&quot;,string.byte(c), spacer or &quot;&quot;)
      end)
   )
end

function accept_testresult_change_hex(old_results, new_results)
   local reqfile = io.open(&quot;_MTN/wanted-testresults&quot;, &quot;r&quot;)
   if (reqfile == nil) then return true end
   local line = reqfile:read()
   local required = {}
   while (line ~= nil)
   do
      required[line] = true
      line = reqfile:read()
   end
   io.close(reqfile)
   for test, res in pairs(required)
   do
      if old_results[test] == true and new_results[test] ~= true
      then
         return false
      end
   end
   return true
end

function accept_testresult_change(old_results, new_results)
   -- Hex encode each of the key hashes to match those in 'wanted-testresults'
   local old_results_hex = {}
   for k, v in pairs(old_results) do
	old_results_hex[hex_dump(k)] = v
   end

   local new_results_hex = {}
   for k, v in pairs(new_results) do
      new_results_hex[hex_dump(k)] = v
   end

   return accept_testresult_change_hex(old_results_hex, new_results_hex)
end

-- merger support

-- Fields in the mergers structure:
-- cmd       : a function that performs the merge operation using the chosen
--             program, best try.
-- available : a function that checks that the needed program is installed and
--             in $PATH
-- wanted    : a function that checks if the user doesn't want to use this
--             method, and returns false if so.  This should normally return
--             true, but in some cases, especially when the merger is really
--             an editor, the user might have a preference in EDITOR and we
--             need to respect that.
--             NOTE: wanted is only used when the user has NOT defined the
--             `merger' variable or the MTN_MERGE environment variable.
mergers = {}

-- This merger is designed to fail if there are any conflicts without trying to resolve them
mergers.fail = {
   cmd = function (tbl) return false end,
   available = function () return true end,
   wanted = function () return true end
}

mergers.meld = {
   cmd = function (tbl)
      io.write(string.format(
        &quot;\nWARNING: 'meld' was chosen to perform an external 3-way merge.\n&quot;..
        &quot;You must merge all changes to the *CENTER* file.\n\n&quot;
      ))
      local path = &quot;meld&quot;
      local ret = execute(path, tbl.lfile, tbl.afile, tbl.rfile)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), path))
         return false
      end
      return tbl.afile
   end ,
   available = function () return program_exists_in_path(&quot;meld&quot;) end,
   wanted = function () return true end
}

mergers.diffuse = {
   cmd = function (tbl)
      io.write(string.format(
        &quot;\nWARNING: 'diffuse' was chosen to perform an external 3-way merge.\n&quot;..
        &quot;You must merge all changes to the *CENTER* file.\n\n&quot;
      ))
      local path = &quot;diffuse&quot;
      local ret = execute(path, tbl.lfile, tbl.afile, tbl.rfile)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), path))
         return false
      end
      return tbl.afile
   end ,
   available = function () return program_exists_in_path(&quot;diffuse&quot;) end,
   wanted = function () return true end
}

mergers.tortoise = {
   cmd = function (tbl)
      local path = &quot;tortoisemerge&quot;
      local ret = execute(path,
                          string.format(&quot;/base:%s&quot;, tbl.afile),
                          string.format(&quot;/theirs:%s&quot;, tbl.lfile),
                          string.format(&quot;/mine:%s&quot;, tbl.rfile),
                          string.format(&quot;/merged:%s&quot;, tbl.outfile))
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), path))
         return false
      end
      return tbl.outfile
   end ,
   available = function() return program_exists_in_path (&quot;tortoisemerge&quot;) end,
   wanted = function () return true end
}

mergers.vim = {
   cmd = function (tbl)
      function execute_diff3(mine, yours, out)
     local diff3_args = {
        &quot;diff3&quot;,
        &quot;--merge&quot;,
        &quot;--easy-only&quot;,
     }
     table.insert(diff3_args, string.gsub(mine, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)
     table.insert(diff3_args, string.gsub(tbl.afile, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)
     table.insert(diff3_args, string.gsub(yours, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)

     return execute_redirected(&quot;&quot;, string.gsub(out, &quot;\\&quot;, &quot;/&quot;), &quot;&quot;, unpack(diff3_args))
      end

      io.write (string.format(&quot;\nWARNING: 'vim' was chosen to perform &quot;..
                  &quot;an external 3-way merge.\n&quot;..
                  &quot;You must merge all changes to the &quot;..
                  &quot;*LEFT* file.\n&quot;))

      local vim
      if os.getenv (&quot;DISPLAY&quot;) ~= nil and program_exists_in_path (&quot;gvim&quot;) then
     vim = &quot;gvim&quot;
      else
     vim = &quot;vim&quot;
      end

      local lfile_merged = tbl.lfile .. &quot;.merged&quot;
      local rfile_merged = tbl.rfile .. &quot;.merged&quot;

      -- first merge lfile using diff3
      local ret = execute_diff3(tbl.lfile, tbl.rfile, lfile_merged)
      if ret == 2 then
         io.write(string.format(gettext(&quot;Error running diff3 for merger '%s'\n&quot;), vim))
         os.remove(lfile_merged)
     return false
      end

      -- now merge rfile using diff3
      ret = execute_diff3(tbl.rfile, tbl.lfile, rfile_merged)
      if ret == 2 then
         io.write(string.format(gettext(&quot;Error running diff3 for merger '%s'\n&quot;), vim))
         os.remove(lfile_merged)
         os.remove(rfile_merged)
     return false
      end

      os.rename(lfile_merged, tbl.lfile)
      os.rename(rfile_merged, tbl.rfile)

      local ret = execute(vim, &quot;-f&quot;, &quot;-d&quot;, &quot;-c&quot;, string.format(&quot;silent file %s&quot;, tbl.outfile),
                          tbl.lfile, tbl.rfile)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), vim))
         return false
      end
      return tbl.outfile
   end ,
   available =
      function ()
     return program_exists_in_path(&quot;diff3&quot;) and
            (program_exists_in_path(&quot;vim&quot;) or
        program_exists_in_path(&quot;gvim&quot;))
      end ,
   wanted =
      function ()
     local editor = os.getenv(&quot;EDITOR&quot;)
     if editor and
        not (string.find(editor, &quot;vim&quot;) or
         string.find(editor, &quot;gvim&quot;)) then
        return false
     end
     return true
      end
}

mergers.rcsmerge = {
   cmd = function (tbl)
      -- XXX: This is tough - should we check if conflict markers stay or not?
      -- If so, we should certainly give the user some way to still force
      -- the merge to proceed since they can appear in the files (and I saw
      -- that). --pasky
      local merge = os.getenv(&quot;MTN_RCSMERGE&quot;)
      if execute(merge, tbl.lfile, tbl.afile, tbl.rfile) == 0 then
         copy_text_file(tbl.lfile, tbl.outfile);
         return tbl.outfile
      end
      local ret = execute(&quot;vim&quot;, &quot;-f&quot;, &quot;-c&quot;, string.format(&quot;file %s&quot;, tbl.outfile
),
                          tbl.lfile)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), &quot;vim&quot;))
         return false
      end
      return tbl.outfile
   end,
   available =
      function ()
     local merge = os.getenv(&quot;MTN_RCSMERGE&quot;)
     return merge and
        program_exists_in_path(merge) and program_exists_in_path(&quot;vim&quot;)
      end ,
   wanted = function () return os.getenv(&quot;MTN_RCSMERGE&quot;) ~= nil end
}

--  GNU diffutils based merging
mergers.diffutils = {
    --  merge procedure execution
    cmd = function (tbl)
        --  parse options
        local option = {}
        option.partial = false
        option.diff3opts = &quot;&quot;
        option.sdiffopts = &quot;&quot;
        local options = os.getenv(&quot;MTN_MERGE_DIFFUTILS&quot;)
        if options ~= nil then
            for spec in string.gmatch(options, &quot;%s*(%w[^,]*)%s*,?&quot;) do
                local name, value = string.match(spec, &quot;^(%w+)=([^,]*)&quot;)
                if name == nil then
                    name = spec
                    value = true
                end
                if type(option[name]) == &quot;nil&quot; then
                    io.write(&quot;mtn: &quot; .. string.format(gettext(&quot;invalid \&quot;diffutils\&quot; merger option \&quot;%s\&quot;&quot;), name) .. &quot;\n&quot;)
                    return false
                end
                option[name] = value
            end
        end

        --  determine the diff3(1) command
        local diff3 = {
            &quot;diff3&quot;,
            &quot;--merge&quot;,
            &quot;--label&quot;, string.format(&quot;%s [left]&quot;,     tbl.left_path ),
            &quot;--label&quot;, string.format(&quot;%s [ancestor]&quot;, tbl.anc_path  ),
            &quot;--label&quot;, string.format(&quot;%s [right]&quot;,    tbl.right_path),
        }
        if option.diff3opts ~= &quot;&quot; then
            for opt in string.gmatch(option.diff3opts, &quot;%s*([^%s]+)%s*&quot;) do
                table.insert(diff3, opt)
            end
        end
        table.insert(diff3, string.gsub(tbl.lfile, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)
        table.insert(diff3, string.gsub(tbl.afile, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)
        table.insert(diff3, string.gsub(tbl.rfile, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)

        --  dispatch according to major operation mode
        if option.partial then
            --  partial batch/non-modal 3-way merge &quot;resolution&quot;:
            --  simply merge content with help of conflict markers
            io.write(&quot;mtn: &quot; .. gettext(&quot;3-way merge via GNU diffutils, resolving conflicts via conflict markers&quot;) .. &quot;\n&quot;)
            local ret = execute_redirected(&quot;&quot;, string.gsub(tbl.outfile, &quot;\\&quot;, &quot;/&quot;), &quot;&quot;, unpack(diff3))
            if ret == 2 then
                io.write(&quot;mtn: &quot; .. gettext(&quot;error running GNU diffutils 3-way difference/merge tool \&quot;diff3\&quot;&quot;) .. &quot;\n&quot;)
                return false
            end
            return tbl.outfile
        else
            --  real interactive/modal 3/2-way merge resolution:
            --  display 3-way merge conflict and perform 2-way merge resolution
            io.write(&quot;mtn: &quot; .. gettext(&quot;3-way merge via GNU diffutils, resolving conflicts via interactive prompt&quot;) .. &quot;\n&quot;)

            --  display 3-way merge conflict (batch)
            io.write(&quot;\n&quot;)
            io.write(&quot;mtn: &quot; .. gettext(&quot;---- CONFLICT SUMMARY ------------------------------------------------&quot;) .. &quot;\n&quot;)
            local ret = execute(unpack(diff3))
            if ret == 2 then
                io.write(&quot;mtn: &quot; .. gettext(&quot;error running GNU diffutils 3-way difference/merge tool \&quot;diff3\&quot;&quot;) .. &quot;\n&quot;)
                return false
            end

            --  perform 2-way merge resolution (interactive)
            io.write(&quot;\n&quot;)
            io.write(&quot;mtn: &quot; .. gettext(&quot;---- CONFLICT RESOLUTION ---------------------------------------------&quot;) .. &quot;\n&quot;)
            local sdiff = {
                &quot;sdiff&quot;,
                &quot;--diff-program=diff&quot;,
                &quot;--suppress-common-lines&quot;,
                &quot;--minimal&quot;,
                &quot;--output=&quot; .. string.gsub(tbl.outfile, &quot;\\&quot;, &quot;/&quot;)
            }
            if option.sdiffopts ~= &quot;&quot; then
                for opt in string.gmatch(option.sdiffopts, &quot;%s*([^%s]+)%s*&quot;) do
                    table.insert(sdiff, opt)
                end
            end
            table.insert(sdiff, string.gsub(tbl.lfile, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)
            table.insert(sdiff, string.gsub(tbl.rfile, &quot;\\&quot;, &quot;/&quot;) .. &quot;&quot;)
            local ret = execute(unpack(sdiff))
            if ret == 2 then
                io.write(&quot;mtn: &quot; .. gettext(&quot;error running GNU diffutils 2-way merging tool \&quot;sdiff\&quot;&quot;) .. &quot;\n&quot;)
                return false
            end
            return tbl.outfile
        end
    end,

    --  merge procedure availability check
    available = function ()
        --  make sure the GNU diffutils tools are available
        return program_exists_in_path(&quot;diff3&quot;) and
               program_exists_in_path(&quot;sdiff&quot;) and
               program_exists_in_path(&quot;diff&quot;);
    end,

    --  merge procedure request check
    wanted = function ()
        --  assume it is requested (if it is available at all)
        return true
    end
}

mergers.emacs = {
   cmd = function (tbl)
      local emacs
      if program_exists_in_path(&quot;xemacs&quot;) then
         emacs = &quot;xemacs&quot;
      else
         emacs = &quot;emacs&quot;
      end
      local elisp = &quot;(ediff-merge-files-with-ancestor \&quot;%s\&quot; \&quot;%s\&quot; \&quot;%s\&quot; nil \&quot;%s\&quot;)&quot;
      -- Converting backslashes is necessary on Win32 MinGW; emacs
      -- lisp string syntax says '\' is an escape.
      local ret = execute(emacs, &quot;--eval&quot;,
                          string.format(elisp,
                          string.gsub (tbl.lfile, &quot;\\&quot;, &quot;/&quot;),
                          string.gsub (tbl.rfile, &quot;\\&quot;, &quot;/&quot;),
                          string.gsub (tbl.afile, &quot;\\&quot;, &quot;/&quot;),
                          string.gsub (tbl.outfile, &quot;\\&quot;, &quot;/&quot;)))
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), emacs))
         return false
      end
      return tbl.outfile
   end,
   available =
      function ()
     return program_exists_in_path(&quot;xemacs&quot;) or
        program_exists_in_path(&quot;emacs&quot;)
      end ,
   wanted =
      function ()
     local editor = os.getenv(&quot;EDITOR&quot;)
     if editor and
        not (string.find(editor, &quot;emacs&quot;) or
         string.find(editor, &quot;gnu&quot;)) then
        return false
     end
     return true
      end
}

mergers.xxdiff = {
   cmd = function (tbl)
      local path = &quot;xxdiff&quot;
      local ret = execute(path,
                        &quot;--title1&quot;, tbl.left_path,
                        &quot;--title2&quot;, tbl.right_path,
                        &quot;--title3&quot;, tbl.merged_path,
                        tbl.lfile, tbl.afile, tbl.rfile,
                        &quot;--merge&quot;,
                        &quot;--merged-filename&quot;, tbl.outfile,
                        &quot;--exit-with-merge-status&quot;)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), path))
         return false
      end
      return tbl.outfile
   end,
   available = function () return program_exists_in_path(&quot;xxdiff&quot;) end,
   wanted = function () return true end
}

mergers.kdiff3 = {
   cmd = function (tbl)
      local path = &quot;kdiff3&quot;
      local ret = execute(path,
                          &quot;--L1&quot;, tbl.anc_path,
                          &quot;--L2&quot;, tbl.left_path,
                          &quot;--L3&quot;, tbl.right_path,
                          tbl.afile, tbl.lfile, tbl.rfile,
                          &quot;--merge&quot;,
                          &quot;--o&quot;, tbl.outfile)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), path))
         return false
      end
      return tbl.outfile
   end,
   available = function () return program_exists_in_path(&quot;kdiff3&quot;) end,
   wanted = function () return true end
}

mergers.opendiff = {
   cmd = function (tbl)
      local path = &quot;opendiff&quot;
      -- As opendiff immediately returns, let user confirm manually
      local ret = execute_confirm(path,
                                  tbl.lfile,tbl.rfile,
                                  &quot;-ancestor&quot;,tbl.afile,
                                  &quot;-merge&quot;,tbl.outfile)
      if (ret ~= 0) then
         io.write(string.format(gettext(&quot;Error running merger '%s'\n&quot;), path))
         return false
      end
      return tbl.outfile
   end,
   available = function () return program_exists_in_path(&quot;opendiff&quot;) end,
   wanted = function () return true end
}

function write_to_temporary_file(data, namehint, filemodehint)
   tmp, filename = temp_file(namehint, filemodehint)
   if (tmp == nil) then
      return nil
   end;
   tmp:write(data)
   io.close(tmp)
   return filename
end

function copy_text_file(srcname, destname)
   src = io.open(srcname, &quot;r&quot;)
   if (src == nil) then return nil end
   dest = io.open(destname, &quot;w&quot;)
   if (dest == nil) then return nil end

   while true do
      local line = src:read()
      if line == nil then break end
      dest:write(line, &quot;\n&quot;)
   end

   io.close(dest)
   io.close(src)
end

function read_contents_of_file(filename, mode)
   tmp = io.open(filename, mode)
   if (tmp == nil) then
      return nil
   end
   local data = tmp:read(&quot;*a&quot;)
   io.close(tmp)
   return data
end

function program_exists_in_path(program)
   return existsonpath(program) == 0
end

function get_preferred_merge3_command (tbl)
   local default_order = {&quot;diffuse&quot;, &quot;kdiff3&quot;, &quot;xxdiff&quot;, &quot;opendiff&quot;,
                          &quot;tortoise&quot;, &quot;emacs&quot;, &quot;vim&quot;, &quot;meld&quot;, &quot;diffutils&quot;}
   local function existmerger(name)
      local m = mergers[name]
      if type(m) == &quot;table&quot; and m.available(tbl) then
         return m.cmd
      end
      return nil
   end
   local function trymerger(name)
      local m = mergers[name]
      if type(m) == &quot;table&quot; and m.available(tbl) and m.wanted(tbl) then
         return m.cmd
      end
      return nil
   end
   -- Check if there's a merger given by the user.
   local mkey = os.getenv(&quot;MTN_MERGE&quot;)
   if not mkey then mkey = merger end
   if not mkey and os.getenv(&quot;MTN_RCSMERGE&quot;) then mkey = &quot;rcsmerge&quot; end
   -- If there was a user-given merger, see if it exists.  If it does, return
   -- the cmd function.  If not, return nil.
   local c
   if mkey then c = existmerger(mkey) end
   if c then return c,mkey end
   if mkey then return nil,mkey end
   -- If there wasn't any user-given merger, take the first that's available
   -- and wanted.
   for _,mkey in ipairs(default_order) do
      c = trymerger(mkey) ; if c then return c,mkey end
   end
end

function merge3 (anc_path, left_path, right_path, merged_path, ancestor, left, right)
   local ret = nil
   local tbl = {}

   tbl.anc_path = anc_path
   tbl.left_path = left_path
   tbl.right_path = right_path

   tbl.merged_path = merged_path
   tbl.afile = nil
   tbl.lfile = nil
   tbl.rfile = nil
   tbl.outfile = nil
   tbl.meld_exists = false
   tbl.lfile = write_to_temporary_file (left, &quot;left&quot;, &quot;r+b&quot;)
   tbl.afile = write_to_temporary_file (ancestor, &quot;ancestor&quot;, &quot;r+b&quot;)
   tbl.rfile = write_to_temporary_file (right, &quot;right&quot;, &quot;r+b&quot;)
   tbl.outfile = write_to_temporary_file (&quot;&quot;, &quot;merged&quot;, &quot;r+b&quot;)

   if tbl.lfile ~= nil and tbl.rfile ~= nil and tbl.afile ~= nil and tbl.outfile ~= nil
   then
      local cmd,mkey = get_preferred_merge3_command (tbl)
      if cmd ~=nil
      then
         io.write (&quot;mtn: &quot; .. string.format(gettext(&quot;executing external 3-way merge via \&quot;%s\&quot; merger\n&quot;), mkey))
         ret = cmd (tbl)
         if not ret then
            ret = nil
         else
            ret = read_contents_of_file (ret, &quot;rb&quot;)
            if string.len (ret) == 0
            then
               ret = nil
            end
         end
      else
     if mkey then
        io.write (string.format(&quot;The possible commands for the &quot;..mkey..&quot; merger aren't available.\n&quot;..
                &quot;You may want to check that $MTN_MERGE or the lua variable `merger' is set\n&quot;..
                &quot;to something available.  If you want to use vim or emacs, you can also\n&quot;..
        &quot;set $EDITOR to something appropriate.\n&quot;))
     else
        io.write (string.format(&quot;No external 3-way merge command found.\n&quot;..
                &quot;You may want to check that $EDITOR is set to an editor that supports 3-way\n&quot;..
                &quot;merge, set this explicitly in your get_preferred_merge3_command hook,\n&quot;..
                &quot;or add a 3-way merge program to your path.\n&quot;))
     end
      end
   end

   os.remove (tbl.lfile)
   os.remove (tbl.rfile)
   os.remove (tbl.afile)
   os.remove (tbl.outfile)

   return ret
end

-- expansion of values used in selector completion

function expand_selector(str)

   -- something which looks like a generic cert pattern
   if string.find(str, &quot;^[^=]*=.*$&quot;)
   then
      return (&quot;c:&quot; .. str)
   end

   -- something which looks like an email address
   if string.find(str, &quot;[%w%-_]+@[%w%-_]+&quot;)
   then
      return (&quot;a:&quot; .. str)
   end

   -- something which looks like a branch name
   if string.find(str, &quot;[%w%-]+%.[%w%-]+&quot;)
   then
      return (&quot;b:&quot; .. str)
   end

   -- a sequence of nothing but hex digits
   if string.find(str, &quot;^%x+$&quot;)
   then
      return (&quot;i:&quot; .. str)
   end

   -- tries to expand as a date
   local dtstr = expand_date(str)
   if  dtstr ~= nil
   then
      return (&quot;d:&quot; .. dtstr)
   end

   return nil
end

-- expansion of a date expression
function expand_date(str)
   -- simple date patterns
   if string.find(str, &quot;^19%d%d%-%d%d&quot;)
      or string.find(str, &quot;^20%d%d%-%d%d&quot;)
   then
      return (str)
   end

   -- &quot;now&quot;
   if str == &quot;now&quot;
   then
      local t = os.time(os.date('!*t'))
      return os.date(&quot;!%Y-%m-%dT%H:%M:%S&quot;, t)
   end

   -- today don't uses the time         # for xgettext's sake, an extra quote
   if str == &quot;today&quot;
   then
      local t = os.time(os.date('!*t'))
      return os.date(&quot;!%Y-%m-%d&quot;, t)
   end

   -- &quot;yesterday&quot;, the source of all hangovers
   if str == &quot;yesterday&quot;
   then
      local t = os.time(os.date('!*t'))
      return os.date(&quot;!%Y-%m-%d&quot;, t - 86400)
   end

   -- &quot;CVS style&quot; relative dates such as &quot;3 weeks ago&quot;
   local trans = {
      minute = 60;
      hour = 3600;
      day = 86400;
      week = 604800;
      month = 2678400;
      year = 31536000
   }
   local pos, len, n, type = string.find(str, &quot;(%d+) ([minutehordaywk]+)s? ago&quot;)
   if trans[type] ~= nil
   then
      local t = os.time(os.date('!*t'))
      if trans[type] &lt;= 3600
      then
        return os.date(&quot;!%Y-%m-%dT%H:%M:%S&quot;, t - (n * trans[type]))
      else
        return os.date(&quot;!%Y-%m-%d&quot;, t - (n * trans[type]))
      end
   end

   return nil
end


external_diff_default_args = &quot;-u&quot;

-- default external diff, works for gnu diff
function external_diff(file_path, data_old, data_new, is_binary, diff_args, rev_old, rev_new)
   local old_file = write_to_temporary_file(data_old, nil, &quot;r+b&quot;);
   local new_file = write_to_temporary_file(data_new, nil, &quot;r+b&quot;);

   if diff_args == nil then diff_args = external_diff_default_args end
   execute(&quot;diff&quot;, diff_args, &quot;--label&quot;, file_path .. &quot;\told&quot;, old_file, &quot;--label&quot;, file_path .. &quot;\tnew&quot;, new_file);

   os.remove (old_file);
   os.remove (new_file);
end

-- netsync permissions hooks (and helper)

function globish_match(glob, str)
      local pcallstatus, result = pcall(function() if (globish.match(glob, str)) then return true else return false end end)
      if pcallstatus == true then
          -- no error
          return result
      else
          -- globish.match had a problem
          return nil
      end
end

function _get_netsync_read_permitted(branch, ident, permfilename, state)
   if not exists(permfilename) or isdir(permfilename) then
      return false
   end
   local permfile = io.open(permfilename, &quot;r&quot;)
   if (permfile == nil) then return false end
   local dat = permfile:read(&quot;*a&quot;)
   io.close(permfile)
   local res = parse_basic_io(dat)
   if res == nil then
      io.stderr:write(&quot;file &quot;..permfilename..&quot; cannot be parsed\n&quot;)
      return false,&quot;continue&quot;
   end
   state[&quot;matches&quot;] = state[&quot;matches&quot;] or false
   state[&quot;cont&quot;] = state[&quot;cont&quot;] or false
   for i, item in pairs(res)
   do
      -- legal names: pattern, allow, deny, continue
      if item.name == &quot;pattern&quot; then
         if state[&quot;matches&quot;] and not state[&quot;cont&quot;] then return false end
         state[&quot;matches&quot;] = false
         state[&quot;cont&quot;] = false
         for j, val in pairs(item.values) do
            if globish_match(val, branch) then state[&quot;matches&quot;] = true end
         end
      elseif item.name == &quot;allow&quot; then if state[&quot;matches&quot;] then
         for j, val in pairs(item.values) do
            if val == &quot;*&quot; then return true end
            if val == &quot;&quot; and ident == nil then return true end
            if ident ~= nil and val == ident.id then return true end
            if ident ~= nil and globish_match(val, ident.name) then return true end
         end
      end elseif item.name == &quot;deny&quot; then if state[&quot;matches&quot;] then
         for j, val in pairs(item.values) do
            if val == &quot;*&quot; then return false end
            if val == &quot;&quot; and ident == nil then return false end
            if ident ~= nil and val == ident.id then return false end
            if ident ~= nil and globish_match(val, ident.name) then return false end
         end
      end elseif item.name == &quot;continue&quot; then if state[&quot;matches&quot;] then
         state[&quot;cont&quot;] = true
         for j, val in pairs(item.values) do
            if val == &quot;false&quot; or val == &quot;no&quot; then
              state[&quot;cont&quot;] = false
            end
         end
      end elseif item.name ~= &quot;comment&quot; then
         io.stderr:write(&quot;unknown symbol in read-permissions: &quot; .. item.name .. &quot;\n&quot;)
         return false
      end
   end
   return false
end

function get_netsync_read_permitted(branch, ident)
   local permfilename = get_confdir() .. &quot;/read-permissions&quot;
   local permdirname = permfilename .. &quot;.d&quot;
   local state = {}
   if _get_netsync_read_permitted(branch, ident, permfilename, state) then
      return true
   end
   if isdir(permdirname) then
      local files = read_directory(permdirname)
      table.sort(files)
      for _,f in ipairs(files) do
        pf = permdirname..&quot;/&quot;..f
        if _get_netsync_read_permitted(branch, ident, pf, state) then
          return true
        end
      end
   end
   return false
end

function _get_netsync_write_permitted(ident, permfilename)
   if not exists(permfilename) or isdir(permfilename) then return false end
   local permfile = io.open(permfilename, &quot;r&quot;)
   if (permfile == nil) then
      return false
   end
   local matches = false
   local line = permfile:read()
   while (not matches and line ~= nil) do
      local _, _, ln = string.find(line, &quot;%s*([^%s]*)%s*&quot;)
      if ln == &quot;*&quot; then matches = true end
      if ln == ident.id then matches = true end
      if globish_match(ln, ident.name) then matches = true end
      line = permfile:read()
   end
   io.close(permfile)
   return matches
end

function get_netsync_write_permitted(ident)
   local permfilename = get_confdir() .. &quot;/write-permissions&quot;
   local permdirname = permfilename .. &quot;.d&quot;
   if _get_netsync_write_permitted(ident, permfilename) then return true end
   if isdir(permdirname) then
      local files = read_directory(permdirname)
      table.sort(files)
      for _,f in ipairs(files) do
        pf = permdirname..&quot;/&quot;..f
        if _get_netsync_write_permitted(ident, pf) then return true end
      end
   end
   return false
end

-- This is a simple function which assumes you're going to be spawning
-- a copy of mtn, so reuses a common bit at the end for converting
-- local args into remote args. You might need to massage the logic a
-- bit if this doesn't fit your assumptions.

function get_netsync_connect_command(uri, args)

        local argv = nil

        if uri[&quot;scheme&quot;] == &quot;ssh&quot;
                and uri[&quot;host&quot;]
                and uri[&quot;path&quot;] then

                argv = { &quot;ssh&quot; }
                if uri[&quot;user&quot;] then
                        table.insert(argv, &quot;-l&quot;)
                        table.insert(argv, uri[&quot;user&quot;])
                end
                if uri[&quot;port&quot;] then
                        table.insert(argv, &quot;-p&quot;)
                        table.insert(argv, uri[&quot;port&quot;])
                end

                -- ssh://host/~/dir/file.mtn or
                -- ssh://host/~user/dir/file.mtn should be home-relative
                if string.find(uri[&quot;path&quot;], &quot;^/~&quot;) then
                        uri[&quot;path&quot;] = string.sub(uri[&quot;path&quot;], 2)
                end

                table.insert(argv, uri[&quot;host&quot;])
        end

        if uri[&quot;scheme&quot;] == &quot;file&quot; and uri[&quot;path&quot;] then
                argv = { }
        end

        if uri[&quot;scheme&quot;] == &quot;ssh+ux&quot;
                and uri[&quot;host&quot;]
                and uri[&quot;path&quot;] then

                argv = { &quot;ssh&quot; }
                if uri[&quot;user&quot;] then
                        table.insert(argv, &quot;-l&quot;)
                        table.insert(argv, uri[&quot;user&quot;])
                end
                if uri[&quot;port&quot;] then
                        table.insert(argv, &quot;-p&quot;)
                        table.insert(argv, uri[&quot;port&quot;])
                end

                -- ssh://host/~/dir/file.mtn or
                -- ssh://host/~user/dir/file.mtn should be home-relative
                if string.find(uri[&quot;path&quot;], &quot;^/~&quot;) then
                        uri[&quot;path&quot;] = string.sub(uri[&quot;path&quot;], 2)
                end

                table.insert(argv, uri[&quot;host&quot;])
                table.insert(argv, get_remote_unix_socket_command(uri[&quot;host&quot;]))
                table.insert(argv, &quot;-&quot;)
                table.insert(argv, &quot;UNIX-CONNECT:&quot; .. uri[&quot;path&quot;])
        else
            if argv then
                    -- start remote monotone process

                    table.insert(argv, get_mtn_command(uri[&quot;host&quot;]))

                    if args[&quot;debug&quot;] then
                            table.insert(argv, &quot;--verbose&quot;)
                    else
                            table.insert(argv, &quot;--quiet&quot;)
                    end

                    table.insert(argv, &quot;--db&quot;)
                    table.insert(argv, uri[&quot;path&quot;])
                    table.insert(argv, &quot;serve&quot;)
                    table.insert(argv, &quot;--stdio&quot;)
                    table.insert(argv, &quot;--no-transport-auth&quot;)

            -- else scheme does not require starting a new remote
            -- process (ie mtn:)
            end
        end
        return argv
end

function use_transport_auth(uri)
        if uri[&quot;scheme&quot;] == &quot;ssh&quot;
        or uri[&quot;scheme&quot;] == &quot;ssh+ux&quot;
        or uri[&quot;scheme&quot;] == &quot;file&quot; then
                return false
        else
                return true
        end
end

function get_mtn_command(host)
        return &quot;mtn&quot;
end

function get_remote_unix_socket_command(host)
    return &quot;socat&quot;
end

function get_default_command_options(command)
    local default_args = {}
    return default_args
end

function get_default_database_alias()
    return &quot;:default.mtn&quot;
end

function get_default_database_locations()
    local paths = {}
    table.insert(paths, get_confdir() .. &quot;/databases&quot;)
    return paths
end

function get_default_database_glob()
    return &quot;*.{mtn,db}&quot;
end

hook_wrapper_dump                = {}
hook_wrapper_dump.depth          = 0
hook_wrapper_dump._string        = function(s) return string.format(&quot;%q&quot;, s) end
hook_wrapper_dump._number        = function(n) return tostring(n) end
hook_wrapper_dump._boolean       = function(b) if (b) then return &quot;true&quot; end return &quot;false&quot; end
hook_wrapper_dump._userdata      = function(u) return &quot;nil --[[userdata]]&quot; end
-- if we really need to return / serialize functions we could do it
-- like cbreak@irc.freenode.net did here: http://lua-users.org/wiki/TablePersistence
hook_wrapper_dump._function      = function(f) return &quot;nil --[[function]]&quot; end
hook_wrapper_dump._nil           = function(n) return &quot;nil&quot; end
hook_wrapper_dump._thread        = function(t) return &quot;nil --[[thread]]&quot; end
hook_wrapper_dump._lightuserdata = function(l) return &quot;nil --[[lightuserdata]]&quot; end

hook_wrapper_dump._table = function(t)
    local buf = ''
    if (hook_wrapper_dump.depth &gt; 0) then
        buf = buf .. '{\n'
    end
    hook_wrapper_dump.depth = hook_wrapper_dump.depth + 1;
    for k,v in pairs(t) do
        buf = buf..string.format('%s[%s] = %s;\n',
              string.rep(&quot;\t&quot;, hook_wrapper_dump.depth - 1),
              hook_wrapper_dump[&quot;_&quot; .. type(k)](k),
              hook_wrapper_dump[&quot;_&quot; .. type(v)](v))
    end
    hook_wrapper_dump.depth = hook_wrapper_dump.depth - 1;
    if (hook_wrapper_dump.depth &gt; 0) then
        buf = buf .. string.rep(&quot;\t&quot;, hook_wrapper_dump.depth - 1) .. '}'
    end
    return buf
end

function hook_wrapper(func_name, ...)
    -- we have to ensure that nil arguments are restored properly for the
    -- function call, see http://lua-users.org/wiki/StoringNilsInTables
    local args = { n=select('#', ...), ... }
    for i=1,args.n do
        local val = assert(loadstring(&quot;return &quot; .. args[i]),
                         &quot;argument &quot;..args[i]..&quot; could not be evaluated&quot;)()
        assert(val ~= nil or args[i] == &quot;nil&quot;,
               &quot;argument &quot;..args[i]..&quot; was evaluated to nil&quot;)
        args[i] = val
    end
    local res = { _G[func_name](unpack(args, 1, args.n)) }
    return hook_wrapper_dump._table(res)
end

do
   -- Hook functions are tables containing any of the following 6 items
   -- with associated functions:
   --
   --   startup			Corresponds to note_mtn_startup()
   --   start			Corresponds to note_netsync_start()
   --   revision_received	Corresponds to note_netsync_revision_received()
   --   revision_sent		Corresponds to note_netsync_revision_sent()
   --   cert_received		Corresponds to note_netsync_cert_received()
   --   cert_sent		Corresponds to note_netsync_cert_sent()
   --   pubkey_received		Corresponds to note_netsync_pubkey_received()
   --   pubkey_sent		Corresponds to note_netsync_pubkey_sent()
   --   end			Corresponds to note_netsync_end()
   --
   -- Those functions take exactly the same arguments as the corresponding
   -- global functions, but return a different kind of value, a tuple
   -- composed of a return code and a value to be returned back to monotone.
   -- The codes are strings:
   -- &quot;continue&quot; and &quot;stop&quot;
   -- When the code &quot;continue&quot; is returned and there's another notifier, the
   -- second value is ignored and the next notifier is called.  Otherwise,
   -- the second value is returned immediately.
   local hook_functions = {}
   local supported_items = {
      &quot;startup&quot;,
      &quot;start&quot;, &quot;revision_received&quot;, &quot;revision_sent&quot;, &quot;cert_received&quot;, &quot;cert_sent&quot;,
      &quot;pubkey_received&quot;, &quot;pubkey_sent&quot;, &quot;end&quot;
   }

   function _hook_functions_helper(f,...)
      local s = &quot;continue&quot;
      local v = nil
      for _,n in pairs(hook_functions) do
         if n[f] then
            s,v = n[f](...)
         end
         if s ~= &quot;continue&quot; then
            break
         end
      end
      return v
   end
   function note_mtn_startup(...)
      return _hook_functions_helper(&quot;startup&quot;,...)
   end
   function note_netsync_start(...)
      return _hook_functions_helper(&quot;start&quot;,...)
   end
   function note_netsync_revision_received(...)
      return _hook_functions_helper(&quot;revision_received&quot;,...)
   end
   function note_netsync_revision_sent(...)
      return _hook_functions_helper(&quot;revision_sent&quot;,...)
   end
   function note_netsync_cert_received(...)
      return _hook_functions_helper(&quot;cert_received&quot;,...)
   end
   function note_netsync_cert_sent(...)
      return _hook_functions_helper(&quot;cert_sent&quot;,...)
   end
   function note_netsync_pubkey_received(...)
      return _hook_functions_helper(&quot;pubkey_received&quot;,...)
   end
   function note_netsync_pubkey_sent(...)
      return _hook_functions_helper(&quot;pubkey_sent&quot;,...)
   end
   function note_netsync_end(...)
      return _hook_functions_helper(&quot;end&quot;,...)
   end

   function add_hook_functions(functions, precedence)
      if type(functions) ~= &quot;table&quot; or type(precedence) ~= &quot;number&quot; then
         return false, &quot;Invalid type&quot;
      end
      if hook_functions[precedence] then
         return false, &quot;Precedence already taken&quot;
      end

      local unknown_items = &quot;&quot;
      local warning = nil
      local is_member =
         function (s,t)
            for k,v in pairs(t) do if s == v then return true end end
            return false
         end

      for n,f in pairs(functions) do
         if type(n) == &quot;string&quot; then
            if not is_member(n, supported_items) then
               if unknown_items ~= &quot;&quot; then
                  unknown_items = unknown_items .. &quot;,&quot;
               end
               unknown_items = unknown_items .. n
            end
            if type(f) ~= &quot;function&quot; then
               return false, &quot;Value for functions item &quot;..n..&quot; isn't a function&quot;
            end
         else
            warning = &quot;Non-string item keys found in functions table&quot;
         end
      end

      if warning == nil and unknown_items ~= &quot;&quot; then
         warning = &quot;Unknown item(s) &quot; .. unknown_items .. &quot; in functions table&quot;
      end

      hook_functions[precedence] = functions
      return true, warning
   end
   function push_hook_functions(functions)
      local n = #hook_functions + 1
      return add_hook_functions(functions, n)
   end

   -- Kept for backward compatibility
   function add_netsync_notifier(notifier, precedence)
      return add_hook_functions(notifier, precedence)
   end
   function push_netsync_notifier(notifier)
      return push_hook_functions(notifier)
   end
end

-- to ensure only mapped authors are allowed through
-- return &quot;&quot; from unmapped_git_author
-- and validate_git_author will fail

function unmapped_git_author(author)
   -- replace &quot;foo@bar&quot; with &quot;foo &lt;foo@bar&gt;&quot;
   name = author:match(&quot;^([^&lt;&gt;]+)@[^&lt;&gt;]+$&quot;)
   if name then
      return name .. &quot; &lt;&quot; .. author .. &quot;&gt;&quot;
   end

   -- replace &quot;&lt;foo@bar&gt;&quot; with &quot;foo &lt;foo@bar&gt;&quot;
   name = author:match(&quot;^&lt;([^&lt;&gt;]+)@[^&lt;&gt;]+&gt;$&quot;)
   if name then
      return name .. &quot; &quot; .. author
   end

   -- replace &quot;foo&quot; with &quot;foo &lt;foo&gt;&quot;
   name = author:match(&quot;^[^&lt;&gt;@]+$&quot;)
   if name then
      return name .. &quot; &lt;&quot; .. name .. &quot;&gt;&quot;
   end

   return author -- unchanged
end

function validate_git_author(author)
   -- ensure author matches the &quot;Name &lt;email&gt;&quot; format git expects
   if author:match(&quot;^[^&lt;]+ &lt;[^&gt;]*&gt;$&quot;) then
      return true
   end

   return false
end

function get_man_page_formatter_command()
   local term_width = guess_terminal_width() - 2
   -- The string returned is run in a process created with 'popen'
   -- (see cmd.cc manpage).
   --
   -- On Unix (and POSIX compliant systems), 'popen' runs 'sh' with
   -- the inherited path.
   --
   -- On MinGW, 'popen' runs 'cmd.exe' with the inherited path. MinGW
   -- does not (currently) provide nroff or equivalent. So we assume
   -- sh, nroff, locale and less are also installed, from Cygwin or
   -- some other toolset.
   --
   -- GROFF_ENCODING is an environment variable that, when set, tells
   -- groff (called by nroff where applicable) to use preconv to convert
   -- the input from the given encoding to something groff understands.
   -- For example, groff doesn NOT understand raw UTF-8 as input, but
   -- it does understand unicode, which preconv will happily provide.
   -- This doesn't help people that don't use groff, unfortunately.
   -- Patches are welcome!
   if string.sub(get_ostype(), 1, 7) == &quot;Windows&quot; then
      return string.format(&quot;sh -c 'GROFF_ENCODING=`locale charmap` nroff -man -rLL=%dn' | less -R&quot;, term_width)
   else
      return string.format(&quot;GROFF_ENCODING=`locale charmap` nroff -man -rLL=%dn | less -R&quot;, term_width)
   end
end

</pre>
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