systemd-resolve: initial shell completion

v2:
- use /sys/class/net to list interfaces,
  also copy the same code to systemd-nspawn
v3:
- do not propose "any" twice for --type

Makefile.am

@@ -5207,6 +5207,12 @@ systemd_resolve_LDADD = \
 bin_PROGRAMS += \
 	systemd-resolve
 
+dist_bashcompletion_data += \
+	shell-completion/bash/systemd-resolve
+
+dist_zshcompletion_data += \
+	shell-completion/zsh/_systemd-resolve
+
 tests += \
 	test-dns-domain \
 	test-dnssec

shell-completion/bash/systemd-nspawn

@@ -45,7 +45,10 @@ __get_env() {
 }
 
 __get_interfaces(){
-    cut -f 1 -d ' ' /proc/net/dev | tail -n +3 | tr -s '\n' | tr -d ':' | xargs
+        { cd /sys/class/net && echo *; } | \
+        while read -d' ' -r name; do
+                [[ "$name" != "lo" ]] && echo "$name"
+        done
 }
 
 _systemd_nspawn() {

shell-completion/bash/systemd-resolve

@@ -0,0 +1,64 @@
+# systemd-resolve(1) completion                             -*- shell-script -*-
+#
+# This file is part of systemd.
+#
+# Copyright 2016 Zbigniew Jędrzejewski-Szmek
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# systemd is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
+__contains_word () {
+        local w word=$1; shift
+        for w in "$@"; do
+                [[ $w = "$word" ]] && return
+        done
+}
+
+__get_interfaces(){
+        { cd /sys/class/net && echo *; } | \
+        while read -d' ' -r name; do
+                [[ "$name" != "lo" ]] && echo "$name"
+        done
+}
+
+_systemd-resolve() {
+        local i comps
+        local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]}
+        local -A OPTS=(
+               [STANDALONE]='-h --help --version -4 -6
+                             --service --openpgp --tlsa --statistics --reset-statistics
+                             --service-address=no --service-txt=no
+                             --cname=no --search=no --legend=no'
+                      [ARG]='-i --interface -p --protocol -t --type -c --class'
+        )
+
+        if __contains_word "$prev" ${OPTS[ARG]}; then
+                case $prev in
+                        --interface|-i)
+                                comps=$( __get_interfaces )
+                                ;;
+                        --protocol|-p|--type|-t|--class|-c)
+                                comps=$( systemd-resolve --legend=no "$prev" help; echo help )
+                                ;;
+                esac
+                COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
+                return 0
+        fi
+
+        if [[ "$cur" = -* ]]; then
+                COMPREPLY=( $(compgen -W '${OPTS[*]}' -- "$cur") )
+                return 0
+        fi
+}
+
+complete -F _systemd-resolve systemd-resolve

shell-completion/zsh/_systemd-resolve

@@ -0,0 +1,64 @@
+#compdef systemd-resolve
+
+#
+# This file is part of systemd.
+#
+# Copyright 2016 Zbigniew Jędrzejewski-Szmek
+#
+# systemd is free software; you can redistribute it and/or modify it
+# under the terms of the GNU Lesser General Public License as published by
+# the Free Software Foundation; either version 2.1 of the License, or
+# (at your option) any later version.
+#
+# systemd is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with systemd; If not, see <http://www.gnu.org/licenses/>.
+
+_dns_protocol() {
+    local -a _protocol
+    _protocol=( $(_call_program protocol ${service} --legend=no --protocol help; echo help) )
+    _values 'protocol' "$_protocol[@]"
+}
+
+_dns_type() {
+    local -a _type
+    _type=( $(_call_program type ${service} --legend=no --type help; echo help) )
+    _values 'type' "$_type[@]"
+}
+
+_dns_class() {
+    local -a _class
+    _class=( $(_call_program class ${service} --legend=no --class help; echo help) )
+    _values 'class' "$_class[@]"
+}
+
+_systemd-resolve_none() {
+    _alternative : \
+        'domain:DNS address:' \
+        'address:email address:'
+}
+
+_arguments \
+    {-h,--help}'[Print a short help text and exit]' \
+    '--version[Print a short version string and exit]' \
+    '--legend=no[Do not show headers and footers]' \
+    '-4[Resolve IPv4 addresses]' \
+    '-6[Resolve IPv6 addresses]' \
+    {-i+,--interface=}'[Look on interface]:interface:_net_interfaces' \
+    {-p+,--protocol=}'[Look via protocol]:protocol:_dns_protocol' \
+    {-t+,--type=}'[Query RR with DNS type]:type:_dns_type' \
+    {-c+,--class=}'[Query RR with DNS class]:class:_dns_class' \
+    '--service[Resolve services]' \
+    '--service-address=no[Do not resolve address for services]' \
+    '--service-txt=no[Do not resolve TXT records for services]' \
+    '--openpgp[Query OpenPGP public key]' \
+    '--tlsa[Query TLS public key]' \
+    '--cname=no[Do not follow CNAME redirects]' \
+    '--search=no[Do not use search domains]' \
+    '--statistics[Show resolver statistics]' \
+    '--reset-statistics[Reset resolver statistics]' \
+    '*::default: _systemd-resolve_none'