Stop requiring function_argzero

This commit is based on [zsh-syntax-highlighting's similar commit][1].

Also, motivated from PR #640.

[1]: https://github.com/zsh-users/zsh-syntax-highlighting/commit/750aebc553f2f4149055ef4cb9d7641f5df6d3ea

src/async.zsh

@@ -15,20 +15,31 @@ _zsh_autosuggest_async_request() {
 		zle -F $_ZSH_AUTOSUGGEST_ASYNC_FD
 
 		# We won't know the pid unless the user has zsh/system module installed
-		if (( _ZSH_AUTOSUGGEST_CHILD_PID )); then
+		if [[ -n "$_ZSH_AUTOSUGGEST_CHILD_PID" ]]; then
-			kill -TERM -- $_ZSH_AUTOSUGGEST_CHILD_PID 2>/dev/null
+			# Zsh will make a new process group for the child process only if job
+			# control is enabled (MONITOR option)
+			if [[ -o MONITOR ]]; then
+				# Send the signal to the process group to kill any processes that may
+				# have been forked by the suggestion strategy
+				kill -TERM -$_ZSH_AUTOSUGGEST_CHILD_PID 2>/dev/null
+			else
+				# Kill just the child process since it wasn't placed in a new process
+				# group. If the suggestion strategy forked any child processes they may
+				# be orphaned and left behind.
+				kill -TERM $_ZSH_AUTOSUGGEST_CHILD_PID 2>/dev/null
+			fi
 		fi
 	fi
 
 	# Fork a process to fetch a suggestion and open a pipe to read from it
 	exec {_ZSH_AUTOSUGGEST_ASYNC_FD}< <(
-		# Tell parent process our pid if we can
+		# Tell parent process our pid
-		echo ${sysparams[pid]:-}
+		echo $sysparams[pid]
 
 		# Fetch and print the suggestion
 		local suggestion
 		_zsh_autosuggest_fetch_suggestion "$1"
-		echo -nE - "$suggestion"
+		echo -nE "$suggestion"
 	)
 
 	# There's a weird bug here where ^C stops working unless we force a fork
@@ -39,15 +50,6 @@ _zsh_autosuggest_async_request() {
 	# Read the pid from the child process
 	read _ZSH_AUTOSUGGEST_CHILD_PID <&$_ZSH_AUTOSUGGEST_ASYNC_FD
 
-	# Zsh will make a new process group for the child process only if job
-	# control is enabled (MONITOR option)
-	if [[ -o MONITOR ]]; then
-		# If we need to kill the background process in the future, we'll send
-		# SIGTERM to the process group to kill any processes that may have been
-		# forked by the suggestion strategy
-		_ZSH_AUTOSUGGEST_CHILD_PID=${_ZSH_AUTOSUGGEST_CHILD_PID:+-$_ZSH_AUTOSUGGEST_CHILD_PID}
-	fi
-
 	# When the fd is readable, call the response handler
 	zle -F "$_ZSH_AUTOSUGGEST_ASYNC_FD" _zsh_autosuggest_async_response
 }
@@ -58,20 +60,17 @@ _zsh_autosuggest_async_request() {
 _zsh_autosuggest_async_response() {
 	emulate -L zsh
 
-	typeset -g _ZSH_AUTOSUGGEST_ASYNC_FD _ZSH_AUTOSUGGEST_CHILD_PID
 	local suggestion
 
-	if [[ $# == 1 || "$2" == "hup" ]]; then
+	if [[ -z "$2" || "$2" == "hup" ]]; then
 		# Read everything from the fd and give it as a suggestion
 		IFS='' read -rd '' -u $1 suggestion
 		zle autosuggest-suggest -- "$suggestion"
 
 		# Close the fd
 		exec {1}<&-
-		_ZSH_AUTOSUGGEST_ASYNC_FD=
-		_ZSH_AUTOSUGGEST_ASYNC_PID=
 	fi
 
 	# Always remove the handler
-	zle -F $1
+	zle -F "$1"
 }

src/config.zsh

@@ -28,6 +28,8 @@ typeset -g ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX=autosuggest-orig-
 		history-search-backward
 		history-beginning-search-forward
 		history-beginning-search-backward
+		history-beginning-search-forward-end
+		history-beginning-search-backward-end
 		history-substring-search-up
 		history-substring-search-down
 		up-line-or-beginning-search

zsh-autosuggestions.plugin.zsh

@@ -1 +1,2 @@
+0=${(%):-%N}
 source ${0:A:h}/zsh-autosuggestions.zsh

zsh-autosuggestions.zsh

@@ -54,6 +54,8 @@ typeset -g ZSH_AUTOSUGGEST_ORIGINAL_WIDGET_PREFIX=autosuggest-orig-
 		history-search-backward
 		history-beginning-search-forward
 		history-beginning-search-backward
+		history-beginning-search-forward-end
+		history-beginning-search-backward-end
 		history-substring-search-up
 		history-substring-search-down
 		up-line-or-beginning-search
@@ -770,20 +772,31 @@ _zsh_autosuggest_async_request() {
 		zle -F $_ZSH_AUTOSUGGEST_ASYNC_FD
 
 		# We won't know the pid unless the user has zsh/system module installed
-		if (( _ZSH_AUTOSUGGEST_CHILD_PID )); then
+		if [[ -n "$_ZSH_AUTOSUGGEST_CHILD_PID" ]]; then
-			kill -TERM -- $_ZSH_AUTOSUGGEST_CHILD_PID 2>/dev/null
+			# Zsh will make a new process group for the child process only if job
+			# control is enabled (MONITOR option)
+			if [[ -o MONITOR ]]; then
+				# Send the signal to the process group to kill any processes that may
+				# have been forked by the suggestion strategy
+				kill -TERM -$_ZSH_AUTOSUGGEST_CHILD_PID 2>/dev/null
+			else
+				# Kill just the child process since it wasn't placed in a new process
+				# group. If the suggestion strategy forked any child processes they may
+				# be orphaned and left behind.
+				kill -TERM $_ZSH_AUTOSUGGEST_CHILD_PID 2>/dev/null
+			fi
 		fi
 	fi
 
 	# Fork a process to fetch a suggestion and open a pipe to read from it
 	exec {_ZSH_AUTOSUGGEST_ASYNC_FD}< <(
-		# Tell parent process our pid if we can
+		# Tell parent process our pid
-		echo ${sysparams[pid]:-}
+		echo $sysparams[pid]
 
 		# Fetch and print the suggestion
 		local suggestion
 		_zsh_autosuggest_fetch_suggestion "$1"
-		echo -nE - "$suggestion"
+		echo -nE "$suggestion"
 	)
 
 	# There's a weird bug here where ^C stops working unless we force a fork
@@ -794,15 +807,6 @@ _zsh_autosuggest_async_request() {
 	# Read the pid from the child process
 	read _ZSH_AUTOSUGGEST_CHILD_PID <&$_ZSH_AUTOSUGGEST_ASYNC_FD
 
-	# Zsh will make a new process group for the child process only if job
-	# control is enabled (MONITOR option)
-	if [[ -o MONITOR ]]; then
-		# If we need to kill the background process in the future, we'll send
-		# SIGTERM to the process group to kill any processes that may have been
-		# forked by the suggestion strategy
-		_ZSH_AUTOSUGGEST_CHILD_PID=${_ZSH_AUTOSUGGEST_CHILD_PID:+-$_ZSH_AUTOSUGGEST_CHILD_PID}
-	fi
-
 	# When the fd is readable, call the response handler
 	zle -F "$_ZSH_AUTOSUGGEST_ASYNC_FD" _zsh_autosuggest_async_response
 }
@@ -813,22 +817,19 @@ _zsh_autosuggest_async_request() {
 _zsh_autosuggest_async_response() {
 	emulate -L zsh
 
-	typeset -g _ZSH_AUTOSUGGEST_ASYNC_FD _ZSH_AUTOSUGGEST_CHILD_PID
 	local suggestion
 
-	if [[ $# == 1 || "$2" == "hup" ]]; then
+	if [[ -z "$2" || "$2" == "hup" ]]; then
 		# Read everything from the fd and give it as a suggestion
 		IFS='' read -rd '' -u $1 suggestion
 		zle autosuggest-suggest -- "$suggestion"
 
 		# Close the fd
 		exec {1}<&-
-		_ZSH_AUTOSUGGEST_ASYNC_FD=
-		_ZSH_AUTOSUGGEST_ASYNC_PID=
 	fi
 
 	# Always remove the handler
-	zle -F $1
+	zle -F "$1"
 }
 
 #--------------------------------------------------------------------#