mirror of
https://github.com/fish-shell/fish-shell
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40 lines
1.2 KiB
Fish
40 lines
1.2 KiB
Fish
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function __fish_print_help --description "Print help message for the specified fish function or builtin" --argument item
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switch $argv[1]
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case '.'
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set item source
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case '*'
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set item $argv[1]
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end
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# Do nothing if the file does not exist
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if not test -e "$__fish_datadir/man/man1/$item.1"
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return
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end
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# These two expressions take care of underlines (Should be italic)
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set -l cmd1 s/_\x08'\(.\)'/(set_color --underline)\\1(set_color normal)/g
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set -l cmd2 s/'\(.\)'\x08_/(set_color --underline)\\1(set_color normal)/g
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# This expression should take care of bold characters. It's not
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# waterproof, since it doesn't check that the same character is
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# used both before and after the backspace, since regular
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# languages don't allow backreferences.
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set -l cmd3 s/.\x08'\(.\)'/(set_color --bold)\\1(set_color normal)/g
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# Combine all expressions in a single variable
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set -l sed_cmd -e $cmd1 -e $cmd2 -e $cmd3
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# Render help output, save output into the variable 'help'
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set -l help (nroff -man "$__fish_datadir/man/man1/$item.1" ^ /dev/null )
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set -l lines (count $help)
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# Print an empty line first
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echo
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# Filter and print help
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printf "%s\n" $help| tail -n (expr $lines - 5) | head -n (expr $lines - 8) | sed $sed_cmd
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end
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