Add support for user actions in the link menu

Allows the user to define additional entries in the link menu which will
execute the given program/script. Each actions is defined using the
"link_action" option. The link URL is stored in the $url enviroment
variable and the current page in $origin, so the user can customize how
do the handling.

Here is a simple example to add three new entries:

    link_action="Debug variables:echo url=$url origin=$origin"
    link_action="Open in MPV:mpv $url"
    link_action="Open in Firefox:firefox $url"

The command is spawned in a forked process using the system() call,
which uses the shell to expand any variable. In particular, the $url
variable is set to the current URL being opened.

Fixes: https://github.com/dillo-browser/dillo/issues/3

1 files changed, 65 insertions, 0 deletions

diff --git a/src/actions.c b/src/actions.c
new file mode 100644
index 00000000..7e197615
--- /dev/null
+++ b/src/actions.c
@@ -0,0 +1,65 @@
+/*
+ * File: actions.c
+ *
+ * Copyright (C) 2024 Rodrigo Arias Mallo <rodarima@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ */
+
+#include "actions.h"
+#include "msg.h"
+#include "../dlib/dlib.h"
+#include <errno.h>
+
+static Dlist *link_actions = NULL;
+
+void
+action_parse(char *line)
+{
+   char *label = strtok(line, ":");
+
+   if (label == NULL || strlen(label) == 0) {
+      MSG("Missing action label, ignoring '%s'\n", line);
+      return;
+   }
+
+   //MSG("Got label='%s'\n", label);
+
+   char *cmd = strtok(NULL, "");
+
+   if (cmd == NULL || strlen(cmd) == 0) {
+      MSG("Missing action command, ignoring '%s'\n", line);
+      return;
+   }
+
+   //MSG("Got action label='%s' cmd='%s'\n", label, cmd);
+
+   Action *action = dMalloc(sizeof(Action));
+   action->label = dStrdup(label);
+   action->cmd = dStrdup(cmd);
+
+   dList_append(link_actions, action);
+}
+
+void
+a_Actions_init(void)
+{
+   int n = dList_length(prefs.link_actions);
+
+   link_actions = dList_new(n);
+
+   for (int i = 0; i < n; i++) {
+      char *line = dList_nth_data(prefs.link_actions, i);
+      if (line)
+         action_parse(line);
+   }
+}
+
+Dlist *
+a_Actions_link_get(void)
+{
+   return link_actions;
+}