Prelim: display README in html format

If README.html exists, it is displayed in the default browser in
preference to README.md in text format.

Still requires the automake files to be modified for markdown (or some
other command) to generate the README.html file.

src/window.c

@@ -188,11 +188,10 @@ static gchar *html_browsers[] =
 	NULL,		NULL
 };
 
-static void help_browser_run(const gchar *section)
+static void help_browser_run(const gchar *path)
 {
 	gchar *name = options->helpers.html_browser.command_name;
 	gchar *cmd = options->helpers.html_browser.command_line;
-	gchar *path = g_build_filename("file://", GQ_HTMLDIR, section, NULL);
 	gchar *result = NULL;
 	gint i;
 
@@ -223,7 +222,6 @@ static void help_browser_run(const gchar *section)
 		return;
 		}
 
-	g_free(path);
 	g_free(result);
 }
 
@@ -246,7 +244,9 @@ void help_window_show(const gchar *key)
 
 	if (key && strstr(key, ".html") != 0)
 		{
-		help_browser_run(key);
+		gchar *path = g_build_filename("file://", GQ_HTMLDIR, key, NULL);
+		help_browser_run(path);
+		g_free(path);
 		return;
 		}
 
@@ -257,12 +257,24 @@ void help_window_show(const gchar *key)
 		return;
 		}
 
-	path = g_build_filename(GQ_HELPDIR, "README.md", NULL);
-	help_window = help_window_new(_("Help"), "help", path, key);
-	g_free(path);
+	path = g_build_filename(GQ_HELPDIR, "README.html", NULL);
+	if (isfile(path))
+		{
+		g_free(path);
+		path = g_build_filename("file://", GQ_HELPDIR, "README.html", NULL);
+		help_browser_run(path);
+		g_free(path);
+		}
+	else
+		{
+		g_free(path);
+		path = g_build_filename(GQ_HELPDIR, "README.md", NULL);
+		help_window = help_window_new(_("Help"), "help", path, key);
+		g_free(path);
 
-	g_signal_connect(G_OBJECT(help_window), "destroy",
-			 G_CALLBACK(help_window_destroy_cb), NULL);
+		g_signal_connect(G_OBJECT(help_window), "destroy",
+				 G_CALLBACK(help_window_destroy_cb), NULL);
+		}
 }
 
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