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# file: /usr/share/zsh/site-functions/_pacman
# use the following in your zsh config:
#   compdef pacman pacman.static=pacman

typeset -A opt_args

# options for passing to _arguments: main pacman commands
_pacman_opts_commands=(
        '-A[Add a package to the system]'
        '-Q[Query the package database]'
        '-R[Remove a package from the system]'
        '-S[Synchronize packages]'
        '-U[Upgrade a package]'
        '-V[Display version and exit]'
        '-h[Display usage]'
)

# options for passing to _arguments: options common to all commands
_pacman_opts_common=(
        '-b[Alternate database location]:database_location:_files -/'
        '-h[Display syntax for the given operation]'
        '-r[Set alternate installation root]:installation root:_files -/'
        '-v[Be more verbose]'
        '--config[An alternate configuration file]:config file:_files'
        '--noconfirm[Do not ask for confirmation]'
)

# options for passing to _arguments: options for --add, and --update commands
_pacman_opts_pkgfile=(
        '-d[Skip dependency checks]'
        '-f[Overwrite conflicting files]'
        '*:package file:_files -g "*.pkg.tar.gz(.)"'
)

# options for passing to _arguments: subactions for --query command
_pacman_opts_query_actions=(
        '-e[List orphaned packages]:*:orphans:->query_orphans'
        '-g[View all members of a package group]:*:package groups:->query_group'
        '-o[Query the package that owns a file]:file:_files'
        '-p[Package file to query]:*:package file:->query_file'
        '-s[Search package names and descriptions]:*:search text:->query_search'
)

# options for passing to _arguments: options for --query and subcommands
_pacman_opts_query_modifiers=(
        '-i[View package information]'
        '-l[List package contents]'
)

# options for passing to _arguments: options for --remove command
_pacman_opts_remove=(
        '-c[Remove all dependent packages]'
        '-d[Skip dependency checks]'
        '-k[Only remove database entry, do not remove files]'
        '-n[Remove protected configuration files]'
        '-s[Remove dependencies not required by other packages]'
        '*:installed package:_pacman_completions_installed_packages'
)

# options for passing to _arguments: options for --sync command
_pacman_opts_sync_actions=(
        '*-c[Remove old packages from cache]:*:clean:->sync_clean'
        '-g[View all members of a package group]:*:package groups:->sync_group'
        '-s[Search package names and descriptions]:*:search text:->sync_search'
)

# options for passing to _arguments: options for --sync command
_pacman_opts_sync_modifiers=(
        '-d[Skip dependency checks]'
        '-f[Overwrite conflicting files]'
        '-i[View package information]'
        '-l[List all packages in a repository]'
        '-p[Print download URIs for each package to be installed]'
        '-u[Upgrade all out-of-date packages]'
        '-w[Download packages only]'
        '-y[Download fresh package databases]'
        '*--ignore[Ignore a package upgrade]:package:_pacman_completions_installed_packages'
        '*--ignoregroup[Ignore a group upgrade]:package group:_pacman_completions_all_groups'
)

# handles --action subcommand
_pacman_action_add() {
        _arguments -s : \
                "$_pacman_opts_common[@]" \
                "$_pacman_opts_pkgfile[@]"
}

# handles --help subcommand
_pacman_action_help() {
        _arguments -s : \
                "$_pacman_opts_commands[@]"
}

# handles cases where no subcommand has yet been given
_pacman_action_none() {
        _arguments -s : \
                "$_pacman_opts_commands[@]"
}

# handles --query subcommand
_pacman_action_query() {
        local context state line
        typeset -A opt_args
        
#       _arguments -s : \
#               "$_pacman_opts_common[@]" \
#               "$_pacman_opts_query_actions[@]" \
#               "$_pacman_opts_query_modifiers[@]"
                
        case $state in
                query_file)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:package file:_files -g "*.pkg.tar.gz"'
                                ;;
                query_group)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:groups:_pacman_completions_installed_groups'
                                ;;
                query_orphans)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]"
                                ;;
                query_owner)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:file:_files'
                                ;;
                query_search)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:search text: '
                                ;;
                *)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_actions[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:package:_pacman_completions_installed_packages'
                                ;;
        esac
}

# handles --remove subcommand
_pacman_action_remove() {
        _arguments -s : \
                "$_pacman_opts_common[@]" \
                "$_pacman_opts_remove[@]"
}

# handles --sync subcommand
_pacman_action_sync() {
        local context state line
        typeset -A opt_args
        
#       _arguments -s : \
#               "$_pacman_opts_common[@]" \
#               "$_pacman_opts_sync_actions[@]" #\
#               #"$_pacman_opts_sync_modifiers[@]"
                
        case $state in
                sync_clean)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_sync_modifiers[@]" \
                                '*-c[Remove old packages from cache]' \
                                ;;
                sync_group)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_sync_modifiers[@]" \
                                '*:package group:_pacman_completions_all_groups'
                                ;;
                sync_search)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_sync_modifiers[@]" \
                                '*:search text: '
                                ;;
                *)
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_sync_modifiers[@]" \
                                '*:package:_pacman_completions_all_packages'
                                ;;
                esac
}

# handles --upgrade subcommand
_pacman_action_upgrade() {
        _arguments -s : \
                "$_pacman_opts_common[@]" \
                "$_pacman_opts_pkgfile[@]"
}

# handles --version subcommand
_pacman_action_version() {
        # no further arguments
        return 0
}

# provides completions for package groups
_pacman_completions_all_groups() {
        local -a cmd groups
        _pacman_get_command
        groups=( $(_call_program groups $cmd[@] -Sg | grep -e \^$PREFIX) )
        compadd "$@" -a groups
}

# provides completions for packages available from repositories
_pacman_completions_all_packages() {
        local -a cmd packages repositories

        repositories=( $(_call_program repositories cat /etc/pacman.conf | grep "^\[" | sed "s,\(\[\|\]\),,g" | grep -v "^options" | sort -u) )
        # these can be specified as either 'package' or 'repository/package'
        if [[ "$PREFIX" == "" ]] ; then
                packages=( $(_call_program packages ls /var/lib/pacman/sync/${^repositories} | grep -v "^/" | sed "s,\-[^-]*\-[^-]*$,," | sort -u) )
        else
                packages=( $(_call_program packages ls /var/lib/pacman/sync/${^repositories} | grep -v "^/" | grep -e \^$PREFIX | sed "s,\-[^-]*\-[^-]*$,," | sort -u) )
        fi
        compadd "$@" -a packages
}

# provides completions for package groups
_pacman_completions_installed_groups() {
        local -a cmd groups
        _pacman_get_command
        groups=( $(_call_program installed_groups $cmd[@] -Qg | cut -d' ' -f1 | grep -e \^$PREFIX | sort -u) )
        compadd "$@" -a groups
}

# provides completions for installed packages
_pacman_completions_installed_packages() {
        local -a cmd packages
        packages=( $(_call_program installed_packages ls /var/lib/pacman/local | grep "^$PREFIX" | sed "s,\-[^-]*\-[^-]*$,,") )
        compadd "$@" -a packages
}

# provides completions for repository names
_pacman_completions_repositories() {
        local -a cmd repositories
        repositories=( $(_call_program repositories cat /etc/pacman.conf | grep "^\[" | sed "s,\(\[\|\]\),,g" | grep -v "^options" | grep "^$PREFIX" | sort -u) )
        compadd "$@" -a repositories
}

# builds command for invoking pacman in a _call_program command - extracts
# relevant options already specified (config file, etc)
# $cmd must be declared by calling function
_pacman_get_command() {
        # this is mostly nicked from _perforce
        cmd=( "pacman" )
        integer i
        for (( i = 2; i < CURRENT - 1; i++ )); do
                if [[ ${words[i]} = "--config" || ${words[i]} = "--root" ]]; then
                        cmd+=( ${words[i,i+1]} )
                fi
        done
}

# main dispatcher
_pacman() {
        case $words[2] in
                -A*)  _pacman_action_add      ;;
                -Qg) # ipkg groups
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:groups:_pacman_completions_installed_groups'
                                ;;
                -Qo) # file *.pkg.tar.gz
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:package file:_files'
                                ;;
                -Qp) # file *.pkg.tar.gz
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_query_modifiers[@]" \
                                '*:package file:_files -g "*.pkg.tar.gz"'
                                ;;
                -Q*)  _pacman_action_query    ;;
                -R*)  _pacman_action_remove   ;;
                -Sl) # repos
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_sync_modifiers[@]" \
                                '*:package repo:_pacman_completions_repositories' \
                                ;;
                -Sg) # pkg groups
                        _arguments -s : \
                                "$_pacman_opts_common[@]" \
                                "$_pacman_opts_sync_modifiers[@]" \
                                '*:package group:_pacman_completions_all_groups'
                                ;;
                -S*)  _pacman_action_sync     ;;
                -U*)  _pacman_action_upgrade  ;;
                -V*)  _pacman_action_version  ;;
                -h*)  _pacman_action_help     ;;
                -  )  _pacman_action_none     ;;
                *  )  return 1                ;;
        esac
}

# run the main dispatcher
_pacman "$@"