core: log to stdout, if headless

Fixes #1475 .

ChangeLog.adoc

@@ -20,6 +20,7 @@ https://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 
 New features::
 
+  * core: weechat-headless logs to stdout rather than ~/.weechat/weechat.log (issue #1475)
   * buflist: evaluate option buflist.look.sort so that sort can be customized for each of the three buflist bar items (issue #1465)
   * relay: add command "handshake" in weechat relay protocol and nonce to prevent replay attacks, add options relay.network.password_hash_algo, relay.network.password_hash_iterations, relay.network.nonce_size (issue #1474)
   * relay: add option relay.network.auth_timeout

src/core/wee-log.c

@@ -68,17 +68,24 @@ log_open (const char *filename, const char *mode)
     if (weechat_log_file)
         return 0;
 
-    if (filename)
+    if (weechat_headless && !weechat_daemon)
+    {
+        weechat_log_file = stdout;
+    }
+    else if (filename)
+    {
         weechat_log_filename = strdup (filename);
+        weechat_log_file = fopen (weechat_log_filename, mode);
+    }
     else
     {
         filename_length = strlen (weechat_home) + 64;
         weechat_log_filename = malloc (filename_length);
         snprintf (weechat_log_filename, filename_length,
                   "%s/%s", weechat_home, WEECHAT_LOG_NAME);
+        weechat_log_file = fopen (weechat_log_filename, mode);
     }
 
-    weechat_log_file = fopen (weechat_log_filename, mode);
     if (!weechat_log_file)
     {
         free (weechat_log_filename);

src/core/weechat.c

@@ -88,6 +88,7 @@
 #define OPTION_NO_GCRYPT  1002
 
 int weechat_headless = 0;              /* 1 if running headless (no GUI)    */
+int weechat_daemon = 0;                /* 1 if daemonized (no foreground)   */
 int weechat_debug_core = 0;            /* debug level for core              */
 char *weechat_argv0 = NULL;            /* WeeChat binary file name (argv[0])*/
 int weechat_upgrading = 0;             /* =1 if WeeChat is upgrading        */

src/core/weechat.h

@@ -100,6 +100,7 @@ struct t_weelist;
 
 /* global variables and functions */
 extern int weechat_headless;
+extern int weechat_daemon;
 extern int weechat_debug_core;
 extern char *weechat_argv0;
 extern int weechat_upgrading;

src/gui/curses/headless/main.c

@@ -88,7 +88,7 @@ daemonize ()
 int
 main (int argc, char *argv[])
 {
-    int i, daemon;
+    int i;
 
     weechat_init_gettext ();
 
@@ -104,16 +104,16 @@ main (int argc, char *argv[])
      * If "--daemon" is received in command line arguments,
      * daemonize the process.
      */
-    daemon = 0;
+    weechat_daemon = 0;
     for (i = 1; i < argc; i++)
     {
         if (strcmp (argv[i], "--daemon") == 0)
         {
-            daemon = 1;
+            weechat_daemon = 1;
             break;
         }
     }
-    if (daemon)
+    if (weechat_daemon)
         daemonize ();
 
     /* init, main loop and end */