mirror of
https://github.com/fish-shell/fish-shell
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107 lines
4 KiB
Fish
107 lines
4 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/$item.1.gz"
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return
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end
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# Render help output, save output into the variable 'help'
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set -l help
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set -l format
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set -l cols
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if test -n "$COLUMNS"
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set cols (math $COLUMNS - 4) # leave a bit of space on the right
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end
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# Pick which command we are using to render output or fail if none
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if command -qs nroff
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set format nroff -c -man -t
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if test -e $__fish_data_dir/groff/fish.tmac
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set -a format -M$__fish_data_dir/groff -mfish
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end
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if test -n "$cols"
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set -a format -rLL={$cols}n
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end
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else if command -qs mandoc
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set format mandoc -c
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if test -n "$cols"
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set -a format -O width=$cols
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end
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else
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echo fish: (_ "Cannot format help; no parser found")
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return 1
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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 ($format "$__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 | $format 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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set -l have_name
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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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# Remove man's bolding
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set -l name (string replace -ra '(.)'\b'.' '$1' -- $line)
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# We start after we have the name
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contains -- $name NAME; and set have_name 1; and continue
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# We ignore the SYNOPSIS header
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contains -- $name SYNOPSIS; and continue
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# Everything after COPYRIGHT is useless
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contains -- $name COPYRIGHT; and break
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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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set -q have_name[1]; or continue
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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 meta
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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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end
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case blank
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switch $line_type
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case normal meta
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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 | string replace -ra '^ ' '' | ul # post-process with `ul`, to interpret the old-style grotty escapes
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end
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