[mouse] Create or delete ~/.elinks/mouse.lock file while changing ui.mouse_disable option. Refs #137

There is no good way to inform slave elinks instances about options. So, for mouse there is a workaround.
Note, If you set ui.mouse_disable = 1 in elinks.conf manually, to get effect on 2nd ELinks instance,
you must also touch ~/.elinks/mouse.lock . Changes via option manager delete or create this file automatically.

src/config/options.c

@@ -7,6 +7,10 @@
 #include <ctype.h>
 #include <string.h>
 
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
 #include "elinks.h"
 
 #include "bfu/dialog.h"
@@ -14,6 +18,7 @@
 #include "config/conf.h"
 #include "config/dialogs.h"
 #include "config/domain.h"
+#include "config/home.h"
 #include "config/options.h"
 #include "config/opttypes.h"
 #include "dialogs/status.h"
@@ -872,6 +877,23 @@ change_hook_ui_double_esc(struct session *ses, struct option *current, struct op
 	return 0;
 }
 
+static int
+change_hook_ui_mouse_disable(struct session *ses, struct option *current, struct option *changed)
+{
+	char *lock_filename = straconcat(empty_string_or_(elinks_home), "mouse.lock", (char *)NULL);
+
+	if (lock_filename) {
+		if (changed->value.number) {
+			creat(lock_filename, 0600);
+		} else {
+			unlink(lock_filename);
+		}
+		mem_free(lock_filename);
+	}
+	return 0;
+}
+
+
 /** Make option templates visible or invisible in the option manager.
  * This is called once on startup, and then each time the value of the
  * "config.show_template" option is changed.
@@ -946,6 +968,7 @@ static const struct change_hook_info change_hooks[] = {
 	{ "terminal",			change_hook_terminal },
 	{ "ui.double_esc",		change_hook_ui_double_esc },
 	{ "ui.language",		change_hook_language },
+	{ "ui.mouse_disable",	change_hook_ui_mouse_disable },
 	{ "ui",				change_hook_ui },
 	{ NULL,				NULL },
 };

src/terminal/kbd.c

@@ -174,8 +174,9 @@ send_init_sequence(int h, int altscreen)
 		write_sequence(h, INIT_ALT_SCREEN_SEQ);
 	}
 #ifdef CONFIG_MOUSE
-	if (! get_opt_bool("ui.mouse_disable", NULL))
+	if (mouse_enabled) {
 		send_mouse_init_sequence(h);
+	}
 #endif
 	write_sequence(h, INIT_BRACKETED_PASTE_SEQ);
 }

src/terminal/mouse.c

@@ -24,6 +24,7 @@
 
 #include "elinks.h"
 
+#include "config/home.h"
 #include "config/options.h"
 #include "dialogs/status.h"
 #include "intl/libintl.h"
@@ -71,7 +72,7 @@ send_mouse_done_sequence(int h)
 	write_sequence(h, DONE_XWIN_MOUSE_SEQ);
 }
 
-static int mouse_enabled;
+int mouse_enabled;
 
 void
 disable_mouse(void)
@@ -84,12 +85,30 @@ disable_mouse(void)
 	mouse_enabled = 0;
 }
 
+static int
+mouse_lock_exists(void)
+{
+	char *lock_filename = straconcat(empty_string_or_(elinks_home), "mouse.lock", (char *) NULL);
+	int res = 0;
+
+	if (lock_filename) {
+		res = !access(lock_filename, F_OK);
+		mem_free(lock_filename);
+	}
+
+	return res;
+}
+
 void
 enable_mouse(void)
 {
 	if (get_opt_bool("ui.mouse_disable", NULL))
 		return;
 
+	if (mouse_lock_exists()) {
+		return;
+	}
+
 	if (mouse_enabled) return;
 
 	if (is_xterm()) send_mouse_init_sequence(get_output_handle());

src/terminal/mouse.h

@@ -9,6 +9,8 @@ struct interlink_event;
 struct itrm;
 struct session;
 
+extern int mouse_enabled;
+
 /* The mouse reporting button byte looks like:
  *
  * -ss??bbb