option to clear the history

src/fe-common/core/command-history.c

@@ -33,6 +33,7 @@
 static HISTORY_REC *global_history;
 static int window_history;
 static GSList *histories;
+static HISTORY_REC *last_cleared_history;
 
 void command_history_add(HISTORY_REC *history, const char *text)
 {
@@ -41,6 +42,13 @@ void command_history_add(HISTORY_REC *history, const char *text)
 	g_return_if_fail(history != NULL);
 	g_return_if_fail(text != NULL);
 
+	if (last_cleared_history == history) {
+		last_cleared_history = NULL;
+		return; /* ignore this history addition, we just
+			   cleared it */
+	}
+	last_cleared_history = NULL;
+
 	link = g_list_last(history->list);
 	if (link != NULL && g_strcmp0(link->data, text) == 0)
 	  return; /* same as previous entry */
@@ -94,13 +102,13 @@ HISTORY_REC *command_history_current(WINDOW_REC *window)
 	if (window == NULL)
 		return global_history;
 
-	if (window_history)
-		return window->history;
-
 	rec = command_history_find_name(window->history_name);
 	if (rec != NULL)
 		return rec;
 
+	if (window_history)
+		return window->history;
+
 	return global_history;
 }
 
@@ -178,6 +186,18 @@ HISTORY_REC *command_history_create(const char *name)
 	return rec;
 }
 
+void command_history_clear(HISTORY_REC *history)
+{
+	g_return_if_fail(history != NULL);
+
+	command_history_clear_pos_func(history, NULL);
+	g_list_foreach(history->list, (GFunc) g_free, NULL);
+	g_list_free(history->list);
+	history->list = NULL;
+	history->lines = 0;
+	last_cleared_history = history;
+}
+
 void command_history_destroy(HISTORY_REC *history)
 {
 	g_return_if_fail(history != NULL);
@@ -186,9 +206,8 @@ void command_history_destroy(HISTORY_REC *history)
 	g_return_if_fail(history->refcount == 0);
 
 	histories = g_slist_remove(histories, history);
-
+	command_history_clear(history);
-	g_list_foreach(history->list, (GFunc) g_free, NULL);
+	last_cleared_history = NULL; /* was destroyed */
-	g_list_free(history->list);
 
 	g_free_not_null(history->name);
 	g_free(history);
@@ -229,6 +248,18 @@ static void sig_window_destroyed(WINDOW_REC *window)
 	g_free_not_null(window->history_name);
 }
 
+static void sig_window_history_cleared(WINDOW_REC *window, const char *name) {
+	HISTORY_REC *history;
+
+	if (name == NULL || *name == '\0') {
+		history = command_history_current(window);
+	} else {
+		history = command_history_find_name(name);
+	}
+
+	command_history_clear(history);
+}
+
 static void sig_window_history_changed(WINDOW_REC *window, const char *oldname)
 {
 	command_history_link(window->history_name);
@@ -279,6 +310,7 @@ void command_history_init(void)
 	signal_add("window created", (SIGNAL_FUNC) sig_window_created);
 	signal_add("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
 	signal_add("window history changed", (SIGNAL_FUNC) sig_window_history_changed);
+	signal_add_last("window history cleared", (SIGNAL_FUNC) sig_window_history_cleared);
 	signal_add("setup changed", (SIGNAL_FUNC) read_settings);
 }
 
@@ -287,6 +319,7 @@ void command_history_deinit(void)
 	signal_remove("window created", (SIGNAL_FUNC) sig_window_created);
 	signal_remove("window destroyed", (SIGNAL_FUNC) sig_window_destroyed);
 	signal_remove("window history changed", (SIGNAL_FUNC) sig_window_history_changed);
+	signal_remove("window history cleared", (SIGNAL_FUNC) sig_window_history_cleared);
 	signal_remove("setup changed", (SIGNAL_FUNC) read_settings);
 
 	command_history_destroy(global_history);

src/fe-common/core/command-history.h

@@ -28,6 +28,7 @@ const char *command_history_next(WINDOW_REC *window, const char *text);
 void command_history_clear_pos(WINDOW_REC *window);
 
 HISTORY_REC *command_history_create(const char *name);
+void command_history_clear(HISTORY_REC *history);
 void command_history_destroy(HISTORY_REC *history);
 void command_history_link(const char *name);
 void command_history_unlink(const char *name);

src/fe-common/core/fe-windows.c

@@ -229,11 +229,16 @@ void window_set_history(WINDOW_REC *window, const char *name)
 	else
 		window->history_name = g_strdup(name);
 
-	signal_emit("window history changed", 1, window, oldname);
+	signal_emit("window history changed", 2, window, oldname);
 
 	g_free_not_null(oldname);
 }
 
+void window_clear_history(WINDOW_REC *window, const char *name)
+{
+	signal_emit("window history cleared", 2, window, name);
+}
+
 void window_set_level(WINDOW_REC *window, int level)
 {
 	g_return_if_fail(window != NULL);

src/fe-common/core/fe-windows.h

@@ -66,6 +66,7 @@ void window_change_server(WINDOW_REC *window, void *server);
 void window_set_refnum(WINDOW_REC *window, int refnum);
 void window_set_name(WINDOW_REC *window, const char *name);
 void window_set_history(WINDOW_REC *window, const char *name);
+void window_clear_history(WINDOW_REC *window, const char *name);
 void window_set_level(WINDOW_REC *window, int level);
 void window_set_immortal(WINDOW_REC *window, int immortal);
 

src/fe-common/core/window-commands.c

@@ -33,6 +33,7 @@
 #include "window-items.h"
 #include "windows-layout.h"
 #include "printtext.h"
+#include "command-history.h"
 
 static void window_print_binds(WINDOW_REC *win)
 {
@@ -615,10 +616,25 @@ static void cmd_window_name(const char *data)
 	}
 }
 
-/* SYNTAX: WINDOW HISTORY <name> */
+/* SYNTAX: WINDOW HISTORY [-clear] <name> */
 void cmd_window_history(const char *data)
 {
-	window_set_history(active_win, data);
+	GHashTable *optlist;
+        char *name;
+	void *free_arg;
+
+	if (!cmd_get_params(data, &free_arg, 1 | PARAM_FLAG_OPTIONS,
+			    "window history", &optlist, &name))
+		return;
+
+	if (g_hash_table_lookup(optlist, "clear") != NULL) {
+		signal_continue(1, data);
+		window_clear_history(active_win, name);
+	} else {
+		window_set_history(active_win, name);
+	}
+
+	cmd_params_free(free_arg);
 }
 
 /* we're moving the first window to last - move the first contiguous block
@@ -883,6 +899,7 @@ void window_commands_init(void)
 	command_set_options("window number", "sticky");
 	command_set_options("window server", "sticky unsticky");
 	command_set_options("window theme", "delete");
+	command_set_options("window history", "clear");
 }
 
 void window_commands_deinit(void)