bash_completion: determine root executable in case of alias

This solves an issue for users that have "alias hg='hg --some_opts'" where they
would see wrong entries in the completion output (such as color codes).

contrib/bash_completion

@@ -1,590 +1,597 b''
 # bash completion for the Mercurial distributed SCM -*- sh -*-
 
 # Docs:
 #
 # If you source this file from your .bashrc, bash should be able to
 # complete a command line that uses hg with all the available commands
 # and options and sometimes even arguments.
 #
 # Mercurial allows you to define additional commands through extensions.
 # Bash should be able to automatically figure out the name of these new
 # commands and their options.  See below for how to define _hg_opt_foo
 # and _hg_cmd_foo functions to fine-tune the completion for option and
 # non-option arguments, respectively.
 #
 #
 # Notes about completion for specific commands:
 #
 # - the completion function for the email command from the patchbomb
 #   extension will try to call _hg_emails to get a list of e-mail
 #   addresses.  It's up to the user to define this function.  For
 #   example, put the addresses of the lists that you usually patchbomb
 #   in ~/.patchbomb-to and the addresses that you usually use to send
 #   the patchbombs in ~/.patchbomb-from and use something like this:
 #
 #      _hg_emails()
 #      {
 #          if [ -r ~/.patchbomb-$1 ]; then
 #              cat ~/.patchbomb-$1
 #          fi
 #      }
 #
 #
 # Writing completion functions for additional commands:
 #
 # If it exists, the function _hg_cmd_foo will be called without
 # arguments to generate the completion candidates for the hg command
 # "foo".  If the command receives some arguments that aren't options
 # even though they start with a "-", you can define a function called
 # _hg_opt_foo to generate the completion candidates.  If _hg_opt_foo
 # doesn't return 0, regular completion for options is attempted.
 #
 # In addition to the regular completion variables provided by bash,
 # the following variables are also set:
 # - $hg - the hg program being used (e.g. /usr/bin/hg)
 # - $cmd - the name of the hg command being completed
 # - $cmd_index - the index of $cmd in $COMP_WORDS
 # - $cur - the current argument being completed
 # - $prev - the argument before $cur
 # - $global_args - "|"-separated list of global options that accept
 #                  an argument (e.g. '--cwd|-R|--repository')
 # - $canonical - 1 if we canonicalized $cmd before calling the function
 #                0 otherwise
 #
 
 shopt -s extglob
 
 _hg_cmd()
 {
     HGPLAIN=1 "$hg" "$@" 2>/dev/null
 }
 
 _hg_commands()
 {
     local commands
     commands="$(HGPLAINEXCEPT=alias _hg_cmd debugcomplete "$cur")" || commands=""
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$commands' -- "$cur"))
 }
 
 _hg_paths()
 {
     local paths="$(_hg_cmd paths -q)"
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$paths' -- "$cur"))
 }
 
 _hg_repos()
 {
     local i
     for i in $(compgen -d -- "$cur"); do
         test ! -d "$i"/.hg || COMPREPLY=(${COMPREPLY[@]:-} "$i")
     done
 }
 
 _hg_debugpathcomplete()
 {
     local files="$(_hg_cmd debugpathcomplete $1 "$cur")"
     local IFS=$'\n'
     compopt -o filenames 2>/dev/null
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
 }
 
 _hg_status()
 {
     local files="$(_hg_cmd status -n$1 "glob:$cur**")"
     local IFS=$'\n'
     compopt -o filenames 2>/dev/null
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
 }
 
 _hg_bookmarks()
 {
     local bookmarks="$(_hg_cmd bookmarks -q)"
     local IFS=$'\n'
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$bookmarks' -- "$cur"))
 }
 
 _hg_labels()
 {
     local labels="$(_hg_cmd debuglabelcomplete "$cur")"
     local IFS=$'\n'
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$labels' -- "$cur"))
 }
 
 # this is "kind of" ugly...
 _hg_count_non_option()
 {
     local i count=0
     local filters="$1"
 
     for ((i=1; $i<=$COMP_CWORD; i++)); do
         if [[ "${COMP_WORDS[i]}" != -* ]]; then
             if [[ ${COMP_WORDS[i-1]} == @($filters|$global_args) ]]; then
                 continue
             fi
             count=$(($count + 1))
         fi
     done
 
     echo $(($count - 1))
 }
 
 _hg()
 {
-    local cur prev cmd cmd_index opts i
+    local cur prev cmd cmd_index opts i aliashg
     # global options that receive an argument
     local global_args='--cwd|-R|--repository'
     local hg="$1"
     local canonical=0
 
+    aliashg=$(alias $hg 2>/dev/null)
+    if [[ -n "$aliashg" ]]; then
+      aliashg=${aliashg#"alias $hg='"}
+      aliashg=${aliashg%"'"}
+      hg=$aliashg
+    fi
+
     COMPREPLY=()
     cur="$2"
     prev="$3"
 
     # searching for the command
     # (first non-option argument that doesn't follow a global option that
     #  receives an argument)
     for ((i=1; $i<=$COMP_CWORD; i++)); do
         if [[ ${COMP_WORDS[i]} != -* ]]; then
             if [[ ${COMP_WORDS[i-1]} != @($global_args) ]]; then
                 cmd="${COMP_WORDS[i]}"
                 cmd_index=$i
                 break
             fi
         fi
     done
 
     if [[ "$cur" == -* ]]; then
         if [ "$(type -t "_hg_opt_$cmd")" = function ] && "_hg_opt_$cmd"; then
             return
         fi
 
         opts=$(_hg_cmd debugcomplete --options "$cmd")
 
         COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$opts' -- "$cur"))
         return
     fi
 
     # global options
     case "$prev" in
         -R|--repository)
             _hg_paths
             _hg_repos
             return
         ;;
         --cwd)
             # Stick with default bash completion
             return
         ;;
     esac
 
     if [ -z "$cmd" ] || [ $COMP_CWORD -eq $i ]; then
         _hg_commands
         return
     fi
 
     # try to generate completion candidates for whatever command the user typed
     local help
     if _hg_command_specific; then
         return
     fi
 
     # canonicalize the command name and try again
     help=$(_hg_cmd help "$cmd")
     if [ $? -ne 0 ]; then
         # Probably either the command doesn't exist or it's ambiguous
         return
     fi
     cmd=${help#hg }
     cmd=${cmd%%[$' \n']*}
     canonical=1
     _hg_command_specific
 }
 
 _hg_command_specific()
 {
     if [ "$(type -t "_hg_cmd_$cmd")" = function ]; then
         "_hg_cmd_$cmd"
         return 0
     fi
 
     if [ "$cmd" != status ] && [ "$prev" = -r ] || [ "$prev" == --rev ]; then
         if [ $canonical = 1 ]; then
             _hg_labels
             return 0
         elif [[ status != "$cmd"* ]]; then
             _hg_labels
             return 0
         else
             return 1
         fi
     fi
 
     local aliascmd=$(_hg_cmd showconfig alias.$cmd | awk '{print $1}')
     [ -n "$aliascmd" ] && cmd=$aliascmd
 
     case "$cmd" in
         help)
             _hg_commands
         ;;
         export)
             if _hg_ext_mq_patchlist qapplied && [ "${COMPREPLY[*]}" ]; then
                 return 0
             fi
             _hg_labels
         ;;
         manifest|update|up|checkout|co)
             _hg_labels
         ;;
         pull|push|outgoing|incoming)
             _hg_paths
             _hg_repos
         ;;
         paths)
             _hg_paths
         ;;
         add)
             _hg_status "u"
         ;;
         merge)
             _hg_labels
         ;;
         commit|ci|record)
             _hg_status "mar"
         ;;
         remove|rm)
             _hg_debugpathcomplete -n
         ;;
         forget)
             _hg_debugpathcomplete -fa
         ;;
         diff)
             _hg_status "mar"
         ;;
         revert)
             _hg_debugpathcomplete
         ;;
         clone)
             local count=$(_hg_count_non_option)
             if [ $count = 1 ]; then
                 _hg_paths
             fi
             _hg_repos
         ;;
         debugindex|debugindexdot)
             COMPREPLY=(${COMPREPLY[@]:-} $(compgen -f -X "!*.i" -- "$cur"))
         ;;
         debugdata)
             COMPREPLY=(${COMPREPLY[@]:-} $(compgen -f -X "!*.d" -- "$cur"))
         ;;
         *)
             return 1
         ;;
     esac
 
     return 0
 }
 
 complete -o bashdefault -o default -F _hg hg \
     || complete -o default -F _hg hg
 
 
 # Completion for commands provided by extensions
 
 # bookmarks
 _hg_cmd_bookmarks()
 {
     if [[ "$prev" = @(-d|--delete|-m|--rename) ]]; then
         _hg_bookmarks
         return
     fi
 }
 
 # mq
 _hg_ext_mq_patchlist()
 {
     local patches
     patches=$(_hg_cmd $1)
     if [ $? -eq 0 ] && [ "$patches" ]; then
         COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$patches' -- "$cur"))
         return 0
     fi
     return 1
 }
 
 _hg_ext_mq_queues()
 {
     local root=$(_hg_cmd root)
     local n
     for n in $(cd "$root"/.hg && compgen -d -- "$cur"); do
         # I think we're usually not interested in the regular "patches" queue
         # so just filter it.
         if [ "$n" != patches ] && [ -e "$root/.hg/$n/series" ]; then
             COMPREPLY=(${COMPREPLY[@]:-} "$n")
         fi
     done
 }
 
 _hg_cmd_qpop()
 {
     if [[ "$prev" = @(-n|--name) ]]; then
         _hg_ext_mq_queues
         return
     fi
     _hg_ext_mq_patchlist qapplied
 }
 
 _hg_cmd_qpush()
 {
     if [[ "$prev" = @(-n|--name) ]]; then
         _hg_ext_mq_queues
         return
     fi
     _hg_ext_mq_patchlist qunapplied
 }
 
 _hg_cmd_qgoto()
 {
     if [[ "$prev" = @(-n|--name) ]]; then
         _hg_ext_mq_queues
         return
     fi
     _hg_ext_mq_patchlist qseries
 }
 
 _hg_cmd_qdelete()
 {
     local qcmd=qunapplied
     if [[ "$prev" = @(-r|--rev) ]]; then
         qcmd=qapplied
     fi
     _hg_ext_mq_patchlist $qcmd
 }
 
 _hg_cmd_qfinish()
 {
     if [[ "$prev" = @(-a|--applied) ]]; then
         return
     fi
     _hg_ext_mq_patchlist qapplied
 }
 
 _hg_cmd_qsave()
 {
     if [[ "$prev" = @(-n|--name) ]]; then
         _hg_ext_mq_queues
         return
     fi
 }
 
 _hg_cmd_rebase() {
    if [[ "$prev" = @(-s|--source|-d|--dest|-b|--base|-r|--rev) ]]; then
        _hg_labels
        return
    fi
 }
 
 _hg_cmd_strip()
 {
     _hg_labels
 }
 
 _hg_cmd_qcommit()
 {
     local root=$(_hg_cmd root)
     # this is run in a sub-shell, so we can't use _hg_status
     local files=$(cd "$root/.hg/patches" && _hg_cmd status -nmar)
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
 }
 
 _hg_cmd_qfold()
 {
     _hg_ext_mq_patchlist qunapplied
 }
 
 _hg_cmd_qrename()
 {
     _hg_ext_mq_patchlist qseries
 }
 
 _hg_cmd_qheader()
 {
     _hg_ext_mq_patchlist qseries
 }
 
 _hg_cmd_qclone()
 {
     local count=$(_hg_count_non_option)
     if [ $count = 1 ]; then
         _hg_paths
     fi
     _hg_repos
 }
 
 _hg_ext_mq_guards()
 {
     _hg_cmd qselect --series | sed -e 's/^.//'
 }
 
 _hg_cmd_qselect()
 {
     local guards=$(_hg_ext_mq_guards)
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$guards' -- "$cur"))
 }
 
 _hg_cmd_qguard()
 {
     local prefix=''
 
     if [[ "$cur" == +* ]]; then
         prefix=+
     elif [[ "$cur" == -* ]]; then
         prefix=-
     fi
     local ncur=${cur#[-+]}
 
     if ! [ "$prefix" ]; then
         _hg_ext_mq_patchlist qseries
         return
     fi
 
     local guards=$(_hg_ext_mq_guards)
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -P $prefix -W '$guards' -- "$ncur"))
 }
 
 _hg_opt_qguard()
 {
     local i
     for ((i=cmd_index+1; i<=COMP_CWORD; i++)); do
         if [[ ${COMP_WORDS[i]} != -* ]]; then
             if [[ ${COMP_WORDS[i-1]} != @($global_args) ]]; then
                 _hg_cmd_qguard
                 return 0
             fi
         elif [ "${COMP_WORDS[i]}" = -- ]; then
             _hg_cmd_qguard
             return 0
         fi
     done
     return 1
 }
 
 _hg_cmd_qqueue()
 {
     local q
     local queues
     local opts="--list --create --rename --delete --purge"
 
     queues=$( _hg_cmd qqueue --quiet )
 
     COMPREPLY=( $( compgen -W "${opts} ${queues}" "${cur}" ) )
 }
 
 
 # hbisect
 _hg_cmd_bisect()
 {
     local i subcmd
 
     # find the sub-command
     for ((i=cmd_index+1; i<=COMP_CWORD; i++)); do
         if [[ ${COMP_WORDS[i]} != -* ]]; then
             if [[ ${COMP_WORDS[i-1]} != @($global_args) ]]; then
                 subcmd="${COMP_WORDS[i]}"
                 break
             fi
         fi
     done
 
     if [ -z "$subcmd" ] || [ $COMP_CWORD -eq $i ] || [ "$subcmd" = help ]; then
         COMPREPLY=(${COMPREPLY[@]:-}
                    $(compgen -W 'bad good help init next reset' -- "$cur"))
         return
     fi
 
     case "$subcmd" in
         good|bad)
             _hg_labels
             ;;
     esac
 
     return
 }
 
 
 # patchbomb
 _hg_cmd_email()
 {
     case "$prev" in
         -c|--cc|-t|--to|-f|--from|--bcc)
             # we need an e-mail address. let the user provide a function
             # to get them
             if [ "$(type -t _hg_emails)" = function ]; then
                 local arg=to
                 if [[ "$prev" == @(-f|--from) ]]; then
                     arg=from
                 fi
                 local addresses=$(_hg_emails $arg)
                 COMPREPLY=(${COMPREPLY[@]:-}
                            $(compgen -W '$addresses' -- "$cur"))
             fi
             return
             ;;
         -m|--mbox)
             # fallback to standard filename completion
             return
             ;;
         -s|--subject)
             # free form string
             return
             ;;
     esac
 
     _hg_labels
     return
 }
 
 
 # gpg
 _hg_cmd_sign()
 {
     _hg_labels
 }
 
 
 # transplant
 _hg_cmd_transplant()
 {
     case "$prev" in
         -s|--source)
             _hg_paths
             _hg_repos
             return
             ;;
         --filter)
             # standard filename completion
             return
             ;;
     esac
 
     # all other transplant options values and command parameters are revisions
     _hg_labels
     return
 }
 
 # shelve
 _hg_shelves()
 {
     local shelves="$(_hg_cmd unshelve -l .)"
     local IFS=$'\n'
     COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$shelves' -- "$cur"))
 }
 
 _hg_cmd_shelve()
 {
     _hg_status "mard"
 }
 
 _hg_cmd_unshelve()
 {
     _hg_shelves
 }