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/usr/share/fish/completions/tex.fish is in fish-common 2.4.0-1.

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The actual contents of the file can be viewed below.

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complete -c tex -o help --description "Display help and exit"
complete -c tex -o version --description "Display version and exit"
complete -c tex -x -a "(
__fish_complete_suffix (commandline -ct) .tex '(La)TeX file'
)"

complete -c tex -o     file-line-error -d "Show errors in style file:line"
complete -c tex -o  no-file-line-error -d "Show errors not in style file:line"
complete -c tex -o  halt-on-error      -d "Stop processing at the first error"
complete -c tex -o  interaction=batchmode   -d "Set interaction mode"
complete -c tex -o  interaction=nonstopmode -d "Set interaction mode"
complete -c tex -o  interaction=scrollmode -d "Set interaction mode"
complete -c tex -o  interaction=errorstopmode -d "Set interaction mode"
complete -c tex -o  output-directory=  -x -a "(__fish_complete_directories (commandline -ct))" -d "Output directory"
complete -c tex -o     shell-escape    -d "Enable \write18{SHELL COMMAND}"
complete -c tex -o  no-shell-escape    -d "Disable \write18{SHELL COMMAND}"
complete -c tex -o  src-specials       -d "Insert source specials into the DVI file"