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#!/bin/zsh
#
# Figure out where to get the best help, and get it.
#
# Install this function by placing it in your FPATH and then
# adding to your .zshrc the lines:
# unalias run-help
# autoload -Uz run-help
#
emulate -RL zsh
local HELPDIR="${HELPDIR:-/usr/share/zsh/$ZSH_VERSION/help}"
[[ $1 == "." ]] && 1="dot"
[[ $1 == ":" ]] && 1="colon"
# Check whether Util/helpfiles has been used to generate zsh help
if [[ $# == 0 || $1 == "-l" ]]
then
if [[ -d $HELPDIR ]]
then
echo "Here is a list of topics for which special help is available:"
echo ""
print -rc $HELPDIR/*(:t)
else
echo "There is no list of special help topics available at this time."
fi
return 0
elif [[ -n "${HELPDIR:-}" && -r $HELPDIR/$1 && $1 != compctl ]]
then
${=PAGER:-more} $HELPDIR/$1
return $?
fi
# No zsh help; use "whence" to figure out where else we might look
local what places noalias newline='
'
integer i=0 didman=0
places=( "${(@f)$(builtin whence -va $1)}" )
if [[ $places = *"not found"* && $1 != ${(Q)1} ]]; then
# Different when unquoted, so try stripping quotes.
places=( "${(@f)$(builtin whence -va ${(Q)1})}" )
if (( ${#places} )); then
set -- "${(Q)@}"
fi
# Quotation is significant to aliases, so suppress lookup.
noalias=1
fi
{
while ((i++ < $#places))
do
what=$places[$i]
[[ -n $noalias && $what = *" is an alias "* ]] && continue
builtin print -r $what
case $what in
(*( is an alias for (noglob|nocorrect))*)
[[ ${what[(w)7]:t} != ${what[(w)1]} ]] &&
run_help_orig_cmd=${what[(w)1]} run-help ${what[(w)7]:t}
;;
(*( is an alias)*)
[[ ${what[(w)6]:t} != ${what[(w)1]} ]] &&
run_help_orig_cmd=${what[(w)1]} run-help ${what[(w)6]:t}
;;
(*( is a * function))
case ${what[(w)1]} in
(comp*) man zshcompsys;;
(zf*) man zshftpsys;;
(run-help) man zshcontrib;;
(*) builtin functions ${what[(w)1]} | ${=PAGER:-more};;
esac;;
(*( is a * builtin))
case ${what[(w)1]} in
(compctl) man zshcompctl;;
(comp*) man zshcompwid;;
(bindkey|vared|zle) man zshzle;;
(*setopt) man zshoptions;;
(cap|getcap|setcap) ;&
(clone) ;&
(ln|mkdir|mv|rm|rmdir|sync) ;&
(sched) ;&
(echotc|echoti|sched|stat|zprof|zpty|zsocket|zstyle|ztcp) man zshmodules;;
(zftp) man zshftpsys;;
(*) man zshbuiltins;;
esac
;;
(*( is hashed to *))
man ${what[(w)-1]:t}
;;
(*( is a reserved word))
man zshmisc
;;
(*)
if ((! didman++))
then
if whence "run-help-$1:t" >/dev/null
then
local cmd_args
builtin getln cmd_args
builtin print -z "$cmd_args"
cmd_args=( ${(z)cmd_args} )
# Discard environment assignments, etc.
while [[ $cmd_args[1] != ${run_help_orig_cmd:-$1} ]]
do
shift cmd_args || return 1
done
eval "run-help-$1:t ${(q@)cmd_args[2,-1]}"
else
POSIXLY_CORRECT=1 man $@:t
fi
fi
;;
esac
if ((i < $#places && ! didman))
then
builtin print -nP "%SPress any key for more help or q to quit%s"
builtin read -k what
[[ $what != $newline ]] && echo
[[ $what == [qQ] ]] && break
fi
done
} always {
unset run_help_orig_cmd
}
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