contrib/bash_completion

revset: predicate to avoid lookup errors

A query like

head() and (descendants("bad") and not descendants("fix"))

(testing if repo heads are affected by a bug) will abort with a
RepoLookupError if either badrev or fixrev aren't found inside
the repository, which is not very informative.

The new predicate returns an empty set for lookup errors, so

head() and (descendants(present("bad")) and not descendants(present("fix")))

will behave as wanted even if those revisions are not found.

# bash completion for the Mercurial distributed SCM

# 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="$(_hg_cmd debugcomplete "$cur")" || commands=""
    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$commands' -- "$cur"))
}

_hg_paths()
{
    local paths="$(_hg_cmd paths | sed -e 's/ = .*$//')"
    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_status()
{
    local files="$(_hg_cmd status -n$1 .)"
    local IFS=$'\n'
    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$files' -- "$cur"))
}

_hg_tags()
{
    local tags="$(_hg_cmd tags -q)"
    local IFS=$'\n'
    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$tags' -- "$cur"))
}

_hg_branches()
{
    local branches="$(_hg_cmd branches -q)"
    local IFS=$'\n'
    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$branches' -- "$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
    # global options that receive an argument
    local global_args='--cwd|-R|--repository'
    local hg="$1"
    local canonical=0

    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 [ $canonical = 1 ]; then
	    _hg_tags
	    _hg_branches
	    return 0
	elif [[ status != "$cmd"* ]]; then
	    _hg_tags
	    _hg_branches
	    return 0
	else
	    return 1
	fi
    fi

    case "$cmd" in
	help)
	    _hg_commands
	;;
	export)
	    if _hg_ext_mq_patchlist qapplied && [ "${COMPREPLY[*]}" ]; then
		return 0
	    fi
	    _hg_tags
	    _hg_branches
	;;
	manifest|update)
	    _hg_tags
	    _hg_branches
	;;
	pull|push|outgoing|incoming)
	    _hg_paths
	    _hg_repos
	;;
	paths)
	    _hg_paths
	;;
	add)
	    _hg_status "u"
	;;
	merge)
	    _hg_tags
	    _hg_branches
	;;
	commit)
	    _hg_status "mar"
	;;
	remove)
	    _hg_status "d"
	;;
	forget)
	    _hg_status "a"
	;;
	diff)
	    _hg_status "mar"
	;;
	revert)
	    _hg_status "mard"
	;;
	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_bookmarks()
{
    local bookmarks="$(_hg_cmd bookmarks --quiet )"
    local IFS=$'\n'
    COMPREPLY=(${COMPREPLY[@]:-} $(compgen -W '$bookmarks' -- "$cur"))
}

_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_strip()
{
    _hg_tags
    _hg_branches
}

_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 --delete"

    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_tags
	    _hg_branches
	    ;;
    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_tags
    _hg_branches
    return
}


# gpg
_hg_cmd_sign()
{
    _hg_tags
    _hg_branches
}


# 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_tags
    _hg_branches
    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
}