Break the argument escaping code into a separate function and use it to

escape key bindings in list-keys. Also escape ~ and ; and $ properly.

arguments.c

@@ -141,22 +141,14 @@ static void
 args_print_add_value(char **buf, size_t *len, struct args_entry *entry,
     struct args_value *value)
 {
-	static const char	 quoted[] = " #\"';$";
 	char	*escaped;
-	int			 flags;
 
 	if (**buf != '\0')
 		args_print_add(buf, len, " -%c ", entry->flag);
 	else
 		args_print_add(buf, len, "-%c ", entry->flag);
 
-	flags = VIS_OCTAL|VIS_TAB|VIS_NL;
+	escaped = args_escape(value->value);
-	if (value->value[strcspn(value->value, quoted)] != '\0')
-		flags |= VIS_DQ;
-	utf8_stravis(&escaped, value->value, flags);
-	if (flags & VIS_DQ)
-		args_print_add(buf, len, "\"%s\"", escaped);
-	else
 	args_print_add(buf, len, "%s", escaped);
 	free(escaped);
 }
@@ -165,20 +157,12 @@ args_print_add_value(char **buf, size_t *len, struct args_entry *entry,
 static void
 args_print_add_argument(char **buf, size_t *len, const char *argument)
 {
-	static const char	 quoted[] = " #\"';$";
 	char	*escaped;
-	int			 flags;
 
 	if (**buf != '\0')
 		args_print_add(buf, len, " ");
 
-	flags = VIS_OCTAL|VIS_TAB|VIS_NL;
+	escaped = args_escape(argument);
-	if (argument[strcspn(argument, quoted)] != '\0')
-		flags |= VIS_DQ;
-	utf8_stravis(&escaped, argument, flags);
-	if (flags & VIS_DQ)
-		args_print_add(buf, len, "\"%s\"", escaped);
-	else
 	args_print_add(buf, len, "%s", escaped);
 	free(escaped);
 }
@@ -219,6 +203,39 @@ args_print(struct args *args)
 	return (buf);
 }
 
+/* Escape an argument. */
+char *
+args_escape(const char *s)
+{
+	static const char	 quoted[] = " #\"';$";
+	char			*escaped, *result;
+	int			 flags;
+
+	if ((strchr(quoted, s[0]) != NULL || s[0] == '~') && s[1] == '\0') {
+		xasprintf(&escaped, "\\%c", s[0]);
+		return (escaped);
+	}
+
+	flags = VIS_OCTAL|VIS_TAB|VIS_NL;
+	if (s[strcspn(s, quoted)] != '\0')
+		flags |= VIS_DQ;
+	utf8_stravis(&escaped, s, flags);
+
+	if (flags & VIS_DQ) {
+		if (*escaped == '~')
+			xasprintf(&result, "\"\\%s\"", escaped);
+		else
+			xasprintf(&result, "\"%s\"", escaped);
+	} else {
+		if (*escaped == '~')
+			xasprintf(&result, "\\%s", escaped);
+		else
+			result = xstrdup(escaped);
+	}
+	free(escaped);
+	return (result);
+}
+
 /* Return if an argument is present. */
 int
 args_has(struct args *args, u_char ch)

cmd-list-keys.c

@@ -60,8 +60,8 @@ cmd_list_keys_exec(struct cmd *self, struct cmdq_item *item)
 	struct args		*args = self->args;
 	struct key_table	*table;
 	struct key_binding	*bd;
-	const char		*key, *tablename, *r;
+	const char		*tablename, *r;
-	char			*cp, tmp[BUFSIZ];
+	char			*key, *cp, tmp[BUFSIZ];
 	int			 repeat, width, tablewidth, keywidth;
 
 	if (self->entry == &cmd_list_commands_entry)
@@ -83,7 +83,7 @@ cmd_list_keys_exec(struct cmd *self, struct cmdq_item *item)
 		}
 		bd = key_bindings_first(table);
 		while (bd != NULL) {
-			key = key_string_lookup_key(bd->key);
+			key = args_escape(key_string_lookup_key(bd->key));
 
 			if (bd->flags & KEY_BINDING_REPEAT)
 				repeat = 1;
@@ -95,6 +95,7 @@ cmd_list_keys_exec(struct cmd *self, struct cmdq_item *item)
 			if (width > keywidth)
 				keywidth = width;
 
+			free(key);
 			bd = key_bindings_next(table, bd);
 		}
 		table = key_bindings_next_table(table);
@@ -108,7 +109,7 @@ cmd_list_keys_exec(struct cmd *self, struct cmdq_item *item)
 		}
 		bd = key_bindings_first(table);
 		while (bd != NULL) {
-			key = key_string_lookup_key(bd->key);
+			key = args_escape(key_string_lookup_key(bd->key));
 
 			if (!repeat)
 				r = "";
@@ -128,11 +129,13 @@ cmd_list_keys_exec(struct cmd *self, struct cmdq_item *item)
 			strlcat(tmp, " ", sizeof tmp);
 			free(cp);
 
-			cp = cmd_list_print(bd->cmdlist);
+			cp = cmd_list_print(bd->cmdlist, 1);
 			strlcat(tmp, cp, sizeof tmp);
 			free(cp);
 
 			cmdq_print(item, "bind-key %s", tmp);
+
+			free(key);
 			bd = key_bindings_next(table, bd);
 		}
 		table = key_bindings_next_table(table);

cmd-list.c

@@ -129,7 +129,7 @@ cmd_list_free(struct cmd_list *cmdlist)
 }
 
 char *
-cmd_list_print(struct cmd_list *cmdlist)
+cmd_list_print(struct cmd_list *cmdlist, int escaped)
 {
 	struct cmd	*cmd;
 	char		*buf, *this;
@@ -141,12 +141,16 @@ cmd_list_print(struct cmd_list *cmdlist)
 	TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
 		this = cmd_print(cmd);
 
-		len += strlen(this) + 3;
+		len += strlen(this) + 4;
 		buf = xrealloc(buf, len);
 
 		strlcat(buf, this, len);
-		if (TAILQ_NEXT(cmd, qentry) != NULL)
+		if (TAILQ_NEXT(cmd, qentry) != NULL) {
+			if (escaped)
+				strlcat(buf, " \\; ", len);
+			else
 				strlcat(buf, " ; ", len);
+		}
 
 		free(this);
 	}

cmd-parse.y

@@ -663,7 +663,7 @@ cmd_parse_from_file(FILE *f, struct cmd_parse_input *pi)
 		cmd_list_free(cmdlist);
 	}
 
-	s = cmd_list_print(result);
+	s = cmd_list_print(result, 0);
 	log_debug("%s: %s", __func__, s);
 	free(s);
 

options.c

@@ -122,7 +122,7 @@ options_value_tostring(struct options_entry *o, union options_value *ov,
 	char	*s;
 
 	if (OPTIONS_IS_COMMAND(o))
-		return (cmd_list_print(ov->cmdlist));
+		return (cmd_list_print(ov->cmdlist, 0));
 	if (OPTIONS_IS_STYLE(o))
 		return (xstrdup(style_tostring(&ov->style)));
 	if (OPTIONS_IS_NUMBER(o)) {

tmux.h

@@ -1950,6 +1950,7 @@ void		 args_set(struct args *, u_char, const char *);
 struct args	*args_parse(const char *, int, char **);
 void		 args_free(struct args *);
 char		*args_print(struct args *);
+char		*args_escape(const char *);
 int		 args_has(struct args *, u_char);
 const char	*args_get(struct args *, u_char);
 const char	*args_first_value(struct args *, u_char, struct args_value **);
@@ -2022,7 +2023,7 @@ void		 cmd_list_append(struct cmd_list *, struct cmd *);
 void		 cmd_list_move(struct cmd_list *, struct cmd_list *);
 struct cmd_list	*cmd_list_parse(int, char **, const char *, u_int, char **);
 void		 cmd_list_free(struct cmd_list *);
-char		*cmd_list_print(struct cmd_list *);
+char		*cmd_list_print(struct cmd_list *, int);
 
 /* cmd-queue.c */
 struct cmdq_item *cmdq_get_command(struct cmd_list *, struct cmd_find_state *,

utf8.c

@@ -18,6 +18,7 @@
 
 #include <sys/types.h>
 
+#include <ctype.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
@@ -182,7 +183,11 @@ utf8_strvis(char *dst, const char *src, size_t len, int flag)
 			/* Not a complete, valid UTF-8 character. */
 			src -= ud.have;
 		}
-		if (src < end - 1)
+		if (src[0] == '$' && src < end - 1) {
+			if (isalpha((u_char)src[1]) || src[1] == '_')
+				*dst++ = '\\';
+			*dst++ = '$';
+		} else if (src < end - 1)
 			dst = vis(dst, src[0], flag, src[1]);
 		else if (src < end)
 			dst = vis(dst, src[0], flag, '\0');