Re: PATCH: Improve Mosh completion

[Oliver Kiddle <okiddle@xxxxxxxxxxx>]

On 10 Nov, Andrei Shevchuk wrote:
> This adds ~/.ssh/config based completion support (_ssh_hosts and
> _ssh_users functions and userhost state handling taken without 
> modifications from ssh completion file), existing code was just wrapped 
> into _mosh function without modifications (except userhost state 
> handling mentioned above).

Daniel and I commented here and on github at the time that it'd be
nicer to factor _ssh_hosts out than to duplicate it. In fact _git also
makes use of _ssh_hosts. So this is a fresh patch based on the original.
It also made no sense to check $opt_args[-l] for mosh as mosh doesn't
have a -l option.

I'm not so sure about _ssh_users. I've expanded it inline in _mosh
here. I've never been entirely happy with the way _combination works
for one thing. For ssh, it is mostly sensible to configure usernames in
.ssh/config anyway so usernames are only relevant when using more than
one on a remote machine. The users-hosts style also disables completion of
hosts from .ssh/config.

Given an ssh configuration of:
  ControlPath /tmp/ssh-%r@%h:%p
It'd be useful to complete established connections conveniently,
especially for scp. So, I can try:
  zstyle -e ':completion:*:(scp|ssh):*:my-accounts' users-hosts \
      'reply=( /tmp/ssh-*@*:*(=N) ); reply=( ${${${reply:t}#*-}%:*} )'
That still breaks up username and hostname completion, requiring two
tabs but also blocks normal completion of hosts from .ssh/config

Oliver


diff --git a/Completion/Unix/Command/_git b/Completion/Unix/Command/_git
index 30ca80835..dccbcc67f 100644
--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -6897,10 +6897,6 @@ __git_tree_files () {
 
 (( $+functions[__git_remote_repositories] )) ||
 __git_remote_repositories () {
-  local service
-
-  service= _ssh
-
   if compset -P '*:'; then
     _remote_files -/ -- ssh
   else
diff --git a/Completion/Unix/Command/_mosh b/Completion/Unix/Command/_mosh
index 431fdbf9e..aa97587bb 100644
--- a/Completion/Unix/Command/_mosh
+++ b/Completion/Unix/Command/_mosh
@@ -1,6 +1,6 @@
 #compdef mosh
 
-local curcontext="$curcontext" state line
+local curcontext="$curcontext" state line expl ret=1
 local -a _comp_priv_prefix
 
 _arguments -C \
@@ -15,12 +15,20 @@ _arguments -C \
   '--server[specify command to run server helper]:remote file:_files' \
   '--client[specify command to run client helper]:_command_names -e' \
   '1:remote host name:->userhost' \
-  '*:::args:_normal' && return
+  '*:::args:_normal' && ret=0
 
 case $state in
   userhost)
-    _hosts || _user_at_host && return
+    if compset -P '*@'; then
+      _wanted hosts expl 'remote host name' _ssh_hosts && ret=0
+    elif compset -S '@*'; then
+      _wanted users expl 'login name' _combination -s '[:@]' my-accounts users-hosts users -S '' && ret=0
+    else
+      _alternative \
+	'hosts:remote host name:_ssh_hosts' \
+	'users:login name:_combination -s "[:@]" my-accounts users-hosts users -qS@' && ret=0
+    fi
   ;;
 esac
 
-return 1
+return ret
diff --git a/Completion/Unix/Command/_ssh b/Completion/Unix/Command/_ssh
index 8a122a5b3..20a5536ee 100644
--- a/Completion/Unix/Command/_ssh
+++ b/Completion/Unix/Command/_ssh
@@ -647,46 +647,4 @@ _ssh_users () {
   _combination -s '[:@]' my-accounts users-hosts users "$@"
 }
 
-_ssh_hosts () {
-  local -a config_hosts
-  local config
-  integer ind
-
-  # If users-hosts matches, we shouldn't complete anything else.
-  if [[ "$IPREFIX" == *@ ]]; then
-    _combination -s '[:@]' my-accounts users-hosts "users=${IPREFIX/@}" hosts "$@" && return
-  else
-    _combination -s '[:@]' my-accounts users-hosts \
-      ${opt_args[-l]:+"users=${opt_args[-l]:q}"} hosts "$@" && return
-  fi
-  if (( ind = ${words[(I)-F]} )); then
-    config=${~words[ind+1]} 2>/dev/null
-  else
-    config="$HOME/.ssh/config"
-  fi
-  if [[ -r $config ]]; then
-    local key line host
-    local -a lines=("${(@f)$(<"$config")}") 2>/dev/null
-    while (($#lines)); do
-      IFS=$'=\t ' read -r key line <<<"${lines[1]}"
-      case "$key" in
-      ((#i)include)
-        lines[1]=("${(@f)$(cd $HOME/.ssh; cat ${(z)~line})}") 2>/dev/null;;
-      ((#i)host(|name))
-        for host in ${(z)line}; do
-          case $host in
-          (*[*?]*) ;;
-          (*) config_hosts+=("$host") ;;
-          esac
-        done ;&
-      (*) shift lines;;
-      esac
-    done
-    if (( ${#config_hosts} )); then
-      _wanted hosts expl 'remote host name' \
-        compadd -M 'm:{a-zA-Z}={A-Za-z} r:|.=* r:|=*' "$@" $config_hosts
-    fi
-  fi
-}
-
 _ssh "$@"
diff --git a/Completion/Unix/Type/_ssh_hosts b/Completion/Unix/Type/_ssh_hosts
new file mode 100644
index 000000000..e20142cfd
--- /dev/null
+++ b/Completion/Unix/Type/_ssh_hosts
@@ -0,0 +1,41 @@
+#autoload
+
+local -a config_hosts
+local config
+integer ind
+
+# If users-hosts matches, we shouldn't complete anything else.
+if [[ "$IPREFIX" == *@ ]]; then
+  _combination -s '[:@]' my-accounts users-hosts "users=${IPREFIX/@}" hosts "$@" && return
+else
+  _combination -s '[:@]' my-accounts users-hosts \
+    ${opt_args[-l]:+"users=${opt_args[-l]:q}"} hosts "$@" && return
+fi
+if (( ind = ${words[(I)-F]} )); then
+  config=${~words[ind+1]} 2>/dev/null
+else
+  config="$HOME/.ssh/config"
+fi
+if [[ -r $config ]]; then
+  local key line host
+  local -a lines=("${(@f)$(<"$config")}") 2>/dev/null
+  while (($#lines)); do
+    IFS=$'=\t ' read -r key line <<<"${lines[1]}"
+    case "$key" in
+    ((#i)include)
+      lines[1]=("${(@f)$(cd $HOME/.ssh; cat ${(z)~line})}") 2>/dev/null;;
+    ((#i)host(|name))
+      for host in ${(z)line}; do
+	case $host in
+	(*[*?]*) ;;
+	(*) config_hosts+=("$host") ;;
+	esac
+      done ;&
+    (*) shift lines;;
+    esac
+  done
+  if (( ${#config_hosts} )); then
+    _wanted hosts expl 'remote host name' \
+      compadd -M 'm:{a-zA-Z}={A-Za-z} r:|.=* r:|=*' "$@" $config_hosts
+  fi
+fi