mirror of
https://github.com/fish-shell/fish-shell
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d727e32934
This had an undocumented internal feature that would pass the tty width along. Instead, just have it read $COLUMNS, which we always define anyway.
85 lines
3.2 KiB
Fish
85 lines
3.2 KiB
Fish
function __fish_print_help --description "Print help message for the specified fish function or builtin" --argument item
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if test "$item" = '.'
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set item source
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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 "$__fish_data_dir/man/man1/$item.1" -o -e "$__fish_data_dir/man/man1/$item.1.gz"
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return
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end
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# Render help output, save output into the variable 'help'
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set -l help
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set -l cols $COLUMNS
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set -l rLL
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if test -n "$cols"
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set cols (math $cols - 4) # leave a bit of space on the right
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set rLL -rLL=$cols[1]n
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end
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set -lx GROFF_TMAC_PATH $__fish_data_dir/groff
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set -l mfish
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if test -e $GROFF_TMAC_PATH/fish.tmac
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set mfish -mfish
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end
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if test -e "$__fish_data_dir/man/man1/$item.1"
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set help (nroff -c -man $mfish -t $rLL "$__fish_data_dir/man/man1/$item.1" 2>/dev/null)
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else if test -e "$__fish_data_dir/man/man1/$item.1.gz"
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set help (gunzip -c "$__fish_data_dir/man/man1/$item.1.gz" 2>/dev/null | nroff -c -man $mfish -t $rLL 2>/dev/null)
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end
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# The original implementation trimmed off the top 5 lines and bottom 3 lines
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# from the nroff output. Perhaps that's reliable, but the magic numbers make
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# me extremely nervous. Instead, let's just strip out any lines that start
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# in the first column. "normal" manpages put all section headers in the first
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# column, but fish manpages only leave NAME like that, which we want to trim
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# away anyway.
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#
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# While we're at it, let's compress sequences of blank lines down to a single
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# blank line, to duplicate the default behavior of `man`, or more accurately,
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# the `-s` flag to `less` that `man` passes.
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set -l state blank
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for line in $help
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# categorize the line
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set -l line_type
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switch $line
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case ' *' \t\*
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# starts with whitespace, check if it has non-whitespace
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printf "%s\n" $line | read -l word __
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if test -n $word
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set line_type normal
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else
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# lines with just spaces probably shouldn't happen
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# but let's consider them to be blank
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set line_type blank
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end
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case ''
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set line_type blank
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case '*'
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# not leading space, and not empty, so must contain a non-space
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# in the first column. That makes it a header/footer.
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set line_type meta
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end
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switch $state
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case normal
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switch $line_type
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case normal
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printf "%s\n" $line
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case blank
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set state blank
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case meta
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# skip it
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end
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case blank
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switch $line_type
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case normal
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echo # print the blank line
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printf "%s\n" $line
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set state normal
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case blank meta
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# skip it
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end
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end
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end | ul # post-process with `ul`, to interpret the old-style grotty escapes
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echo # print a trailing blank line
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end
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