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><A
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>4.3. Graphical interface for Windows</A
></H1
><P
><B
CLASS="COMMAND"
>WinHugs</B
> is a friendly Windows user interface to Hugs.
In addition to the console commands of Hugs (see <A
HREF="using-hugs.html"
>Chapter 2</A
>),
it provides:</P
><P
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><UL
><LI
><P
>colorized prompt and various other items to aid reading.</P
></LI
><LI
><P
>hyperlinks (underlined and in blue); clicking on a hyperlink in an error
message opens an editor at the offending line.</P
></LI
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>a convenient dialog for control of options.</P
></LI
><LI
><P
>menu and button shortcuts for various commands, such as load.</P
></LI
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>browse commands to view the class hierarchy and items in scope.</P
></LI
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>In addition, some escape codes are supported, in particular those which
change the foreground and background color.</P
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><B
>Example 4-1. Getting started with WinHugs</B
></P
><P
>The graphical interface is mostly self-explanatory, but this is a
small introduction to the most commonly used features.</P
><P
>Create a file called <TT
CLASS="FILENAME"
>Main.hs</TT
>, and inside put the text
<PRE
CLASS="PROGRAMLISTING"
>module Main where
main = putStrLn "Hello, WinHugs!</PRE
>
Note that this program contains a syntax error: the closing quote
is missing. Now run <B
CLASS="COMMAND"
>WinHugs</B
>, and click on open
(<SPAN
CLASS="GUIMENU"
>File</SPAN
>-><SPAN
CLASS="GUIMENUITEM"
>Open</SPAN
>)
and browse to the file <TT
CLASS="FILENAME"
>Main.hs</TT
>.
When <B
CLASS="COMMAND"
>WinHugs</B
> loads the file, it reports an error,
along with a link giving its location. Click on this link, and the file
will open in your editor, at the appropriate line.
(If the file doesn't open at the correct line, visit the
options, and under the <SPAN
CLASS="GUILABEL"
>WinHugs</SPAN
> tab set the
<SPAN
CLASS="GUILABEL"
>Editor</SPAN
> value appropriately.)</P
><P
>After you've fixed the error, save the file, switch back to
<B
CLASS="COMMAND"
>WinHugs</B
> and click on the <SPAN
CLASS="GUIBUTTON"
>Run</SPAN
>
button. <B
CLASS="COMMAND"
>WinHugs</B
> will automatically reload your file,
and you can watch it produce a message.</P
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