Fix backslash escaping problems with `echo -E`.

script/test.zsh

@@ -281,6 +281,43 @@ testWidgetClear() {
 		"stub_called _zsh_autosuggest_highlight_apply"
 }
 
+testEscapeCommandPrefix() {
+	assertEquals \
+		"Did not escape single backslash" \
+		"\\\\" \
+		"$(_zsh_autosuggest_escape_command_prefix "\\")"
+
+	assertEquals \
+		"Did not escape two backslashes" \
+		"\\\\\\\\" \
+		"$(_zsh_autosuggest_escape_command_prefix "\\\\")"
+
+	assertEquals \
+		"Did not escape parentheses" \
+		"\\(\\)" \
+		"$(_zsh_autosuggest_escape_command_prefix "()")"
+
+	assertEquals \
+		"Did not escape square brackets" \
+		"\\[\\]" \
+		"$(_zsh_autosuggest_escape_command_prefix "[]")"
+
+	assertEquals \
+		"Did not escape pipe" \
+		"\\|" \
+		"$(_zsh_autosuggest_escape_command_prefix "|")"
+
+	assertEquals \
+		"Did not escape star" \
+		"\\*" \
+		"$(_zsh_autosuggest_escape_command_prefix "*")"
+
+	assertEquals \
+		"Did not escape question mark" \
+		"\\?" \
+		"$(_zsh_autosuggest_escape_command_prefix "?")"
+}
+
 # For zsh compatibility
 setopt shwordsplit
 SHUNIT_PARENT=$0

src/suggestion.zsh

@@ -5,15 +5,19 @@
 
 # Get a suggestion from history that matches a given prefix
 _zsh_autosuggest_suggestion() {
-	setopt localoptions extendedglob
-
-	# Escape the prefix (requires EXTENDED_GLOB)
-	local prefix="${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}"
+	local prefix=$(_zsh_autosuggest_escape_command_prefix "$1")
 
 	# Get all history items (reversed) that match pattern $prefix*
 	local history_matches
 	history_matches=(${(j:\0:s:\0:)history[(R)$prefix*]})
 
 	# Echo the first item that matches
-	echo "$history_matches[1]"
+	echo -E "$history_matches[1]"
+}
+
+_zsh_autosuggest_escape_command_prefix() {
+	setopt localoptions EXTENDED_GLOB
+
+	# Escape special chars in the string (requires EXTENDED_GLOB)
+	echo -E "${1//(#m)[\\()\[\]|*?]/\\$MATCH}"
 }

zsh-autosuggestions.zsh

@@ -291,17 +291,21 @@ zle -N autosuggest-clear _zsh_autosuggest_widget_clear
 
 # Get a suggestion from history that matches a given prefix
 _zsh_autosuggest_suggestion() {
-	setopt localoptions extendedglob
-
-	# Escape the prefix (requires EXTENDED_GLOB)
-	local prefix="${1//(#m)[\][()|\\*?#<>~^]/\\$MATCH}"
+	local prefix=$(_zsh_autosuggest_escape_command_prefix "$1")
 
 	# Get all history items (reversed) that match pattern $prefix*
 	local history_matches
 	history_matches=(${(j:\0:s:\0:)history[(R)$prefix*]})
 
 	# Echo the first item that matches
-	echo "$history_matches[1]"
+	echo -E "$history_matches[1]"
+}
+
+_zsh_autosuggest_escape_command_prefix() {
+	setopt localoptions EXTENDED_GLOB
+
+	# Escape special chars in the string (requires EXTENDED_GLOB)
+	echo -E "${1//(#m)[\\()\[\]|*?]/\\$MATCH}"
 }
 
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