summaryrefslogtreecommitdiff
path: root/app/wlib/gtklib/browserhelp.c
diff options
context:
space:
mode:
authorJörg Frings-Fürst <debian@jff-webhosting.net>2018-03-19 19:55:58 +0100
committerJörg Frings-Fürst <debian@jff-webhosting.net>2018-03-19 19:55:58 +0100
commitd1a8285f818eb7e5c3d6a05709ea21a808490b8c (patch)
tree326578f0505cbed07cfe60de530022822dc237ac /app/wlib/gtklib/browserhelp.c
parent16e9630b79f0a7a90c6cedb6781175bb8b337dc1 (diff)
New upstream version 5.1.0upstream/5.1.0
Diffstat (limited to 'app/wlib/gtklib/browserhelp.c')
-rw-r--r--app/wlib/gtklib/browserhelp.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/app/wlib/gtklib/browserhelp.c b/app/wlib/gtklib/browserhelp.c
new file mode 100644
index 0000000..9351e86
--- /dev/null
+++ b/app/wlib/gtklib/browserhelp.c
@@ -0,0 +1,137 @@
+/** \file browserhelp.c
+ * use the default browser based help
+ */
+
+/* XTrkCad - Model Railroad CAD
+ * Copyright (C) 2015 Martin Fischer
+ *
+ * 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <assert.h>
+
+#include "gtkint.h"
+#include "i18n.h"
+
+#include "dynstring.h"
+
+#define DEFAULTBROWSERCOMMAND "xdg-open"
+
+#define HELPERRORTEXT "Help Error - help information can not be found.\n" \
+ "The help information you requested cannot be shown.\n" \
+ "Usually this is an installation problem, Make sure that a default browser" \
+ " is configured and that XTrackCAD and the included " \
+ "HTML files are installed properly and can be found via the XTRKCADLIB environment " \
+ "variable.\n Also make sure that the user has sufficient access rights to read these" \
+ "files."
+/**
+ * Create a fully qualified url froma topic
+ *
+ * \param helpUrl OUT pointer to url, free by caller
+ * \param topic IN the help topic
+ */
+
+static void
+TopicToUrl(char **helpUrl, const char *topic)
+{
+ DynString url;
+ DynStringMalloc(&url, 16);
+
+ // build up the url line
+ DynStringCatCStrs(&url,
+ "file://",
+ wGetAppLibDir(),
+ "/html/",
+ topic,
+ ".html",
+ NULL);
+
+ *helpUrl = strdup(DynStringToCStr(&url));
+ DynStringFree(&url);
+}
+/**
+ * Extend the PATH variable inthe environment to include XTrackCAD's
+ * script directory.
+ *
+ * \return pointer to old path
+ */
+
+static char *
+ExtendPath(void)
+{
+ char *path = getenv("PATH");
+ DynString newPath;
+ DynStringMalloc(&newPath, 16);
+
+ // append XTrackCAD's directory to the path as a fallback
+ DynStringCatCStrs(&newPath,
+ path,
+ ":",
+ wGetAppLibDir(),
+ NULL);
+
+ setenv("PATH",
+ DynStringToCStr(&newPath),
+ TRUE);
+
+ DynStringFree(&newPath);
+
+ return (path);
+}
+
+/**
+ * Invoke the system's default browser to display help for <topic>. First the
+ * system's standard xdg-open command is attempted. If that is not available, the
+ * version included with the XTrackCAD installation is executed.
+ *
+ * \param topic IN topic string
+ */
+
+void wHelp(const char * topic)
+{
+ int rc;
+ char *url;
+ DynString commandLine;
+ char *currentPath;
+
+ assert(topic != NULL);
+ assert(strlen(topic));
+
+ currentPath = ExtendPath();
+ TopicToUrl(&url, topic);
+
+ DynStringMalloc(&commandLine, 16);
+ DynStringCatCStrs(&commandLine,
+ DEFAULTBROWSERCOMMAND,
+ " ",
+ url,
+ NULL);
+
+ // the command should be found via the PATH
+ rc = system(DynStringToCStr(&commandLine));
+
+ if (rc) {
+ wNotice(HELPERRORTEXT, _("Cancel"), NULL);
+ }
+
+ // restore the PATH
+ setenv("PATH",
+ currentPath,
+ TRUE);
+
+ free(url);
+ DynStringFree(&commandLine);
+}