shell-completion: systemd-analyze verify, systemctl link

Some zsh completion helpers were not installed, so completion
was broken.

Add systemd-analyze verify. Make systemctl link complete only
unit names.

(cherry picked from commit 2c12a402cb)

Conflicts:
	TODO

[backport: undo verify and busname changes]

Makefile.am

@@ -362,6 +362,8 @@ dist_zshcompletion_DATA = \
 	shell-completion/zsh/_systemd-analyze \
 	shell-completion/zsh/_systemd-run \
 	shell-completion/zsh/_sd_hosts_or_user_at_host \
+	shell-completion/zsh/_sd_outputmodes \
+	shell-completion/zsh/_sd_unit_files \
 	shell-completion/zsh/_systemd-delta \
 	shell-completion/zsh/_systemd
 

shell-completion/zsh/_sd_unit_files

@@ -0,0 +1,9 @@
+#autoload
+
+_sd_unit_files() {
+    local files expl
+    files=( '*:files:->files' )
+
+    _description files expl 'unit file'
+    _files "$expl[@]" -g '*.(automount|busname|device|mount|path|service|snapshot|socket|swap|target|timer)'
+}

shell-completion/zsh/_systemctl.in

@@ -259,7 +259,9 @@ for fun in set-environment unset-environment ; do
   }
 done
 
-(( $+functions[_systemctl_link] )) || _systemctl_link() { _files }
+(( $+functions[_systemctl_link] )) || _systemctl_link() {
+   _sd_unit_files
+}
 
 # no systemctl completion for:
 #    [STANDALONE]='daemon-reexec daemon-reload default

shell-completion/zsh/_systemd-analyze

@@ -38,7 +38,12 @@ _systemd_analyze_command(){
 
 _arguments \
     {-h,--help}'[Show help text.]' \
-    '--user[Shows performance data of user sessions instead of the system manager.]' \
+    '--system[Operate on system systemd instance.]' \
+    '--user[Operate on user systemd instance.]' \
+    '--no-pager[Do not user pager.]' \
+    '--no-man[Do not check man pages.]' \
     '--order[When generating graph for dot, show only order]' \
     '--require[When generating graph for dot, show only requirement]' \
+    {-H+,--host=}'[Operate on remote host]:userathost:_sd_hosts_or_user_at_host' \
+    {-M+,--machine=}'[Operate on local container]:machine' \
     '*::systemd-analyze commands:_systemd_analyze_command'