Synctex backwards synchronization

Thanks to Roland Schatz for the patch.

page-widget.c

@@ -13,6 +13,7 @@
 #include "render.h"
 #include "utils.h"
 #include "shortcuts.h"
+#include "synctex.h"
 
 G_DEFINE_TYPE(ZathuraPage, zathura_page_widget, GTK_TYPE_DRAWING_AREA)
 
@@ -611,6 +612,14 @@ cb_zathura_page_widget_button_release_event(GtkWidget* widget, GdkEventButton* b
     }
   } else {
     redraw_rect(ZATHURA_PAGE(widget), &priv->mouse.selection);
+
+    if (priv->zathura->synctex.enabled && button->state & GDK_CONTROL_MASK) {
+      /* synctex backwards sync */
+      double scale = zathura_document_get_scale(document);
+      int x = button->x / scale, y = button->y / scale;
+
+      synctex_edit(priv->zathura, priv->page, x, y);
+    } else {
       zathura_rectangle_t tmp = priv->mouse.selection;
 
       double scale = zathura_document_get_scale(document);
@@ -636,6 +645,7 @@ cb_zathura_page_widget_button_release_event(GtkWidget* widget, GdkEventButton* b
         g_free(text);
       }
     }
+  }
 
   priv->mouse.selection_basepoint.x = -1;
   priv->mouse.selection_basepoint.y = -1;

synctex.c

@@ -0,0 +1,31 @@
+/* See LICENSE file for license and copyright information */
+
+#include "synctex.h"
+
+#include "zathura.h"
+#include "page.h"
+#include "document.h"
+
+#include <glib.h>
+
+void
+synctex_edit(zathura_t* zathura, zathura_page_t* page, int x, int y)
+{
+  zathura_document_t* doc = zathura_page_get_document(page);
+  const char *filename = zathura_document_get_path(doc);
+  int pageIdx = zathura_page_get_index(page);
+
+  char *buffer = g_strdup_printf("%d:%d:%d:%s", pageIdx+1, x, y, filename);
+  if (buffer == NULL)
+    return;
+
+  if (zathura->synctex.editor) {
+    char* argv[] = {"synctex", "edit", "-o", buffer, "-x", zathura->synctex.editor, NULL};
+    g_spawn_async(NULL, argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, NULL);
+  } else {
+    char* argv[] = {"synctex", "edit", "-o", buffer, NULL};
+    g_spawn_async(NULL, argv, NULL, G_SPAWN_SEARCH_PATH, NULL, NULL, NULL, NULL);
+  }
+
+  g_free(buffer);
+}

synctex.h

@@ -0,0 +1,10 @@
+/* See LICENSE file for license and copyright information */
+
+#ifndef SYNCTEX_H
+#define SYNCTEX_H
+
+#include "types.h"
+
+void synctex_edit(zathura_t* zathura, zathura_page_t* page, int x, int y);
+
+#endif

zathura.c

@@ -66,8 +66,8 @@ zathura_init(int argc, char* argv[])
   Window embed = 0;
 #endif
 
-  gchar* config_dir = NULL, *data_dir = NULL, *plugin_path = NULL, *loglevel = NULL, *password = NULL;
+  gchar* config_dir = NULL, *data_dir = NULL, *plugin_path = NULL, *loglevel = NULL, *password = NULL, *synctex_editor = NULL;
-  bool forkback = false, print_version = false;
+  bool forkback = false, print_version = false, synctex = false;
 
   GOptionEntry entries[] = {
     { "reparent",    'e',  0, G_OPTION_ARG_INT,      &embed,         _("Reparents to window specified by xid"),       "xid"  },
@@ -78,6 +78,8 @@ zathura_init(int argc, char* argv[])
     { "password",    'w',  0, G_OPTION_ARG_STRING,   &password,      _("Document password"),                          "password" },
     { "debug",       'l',  0, G_OPTION_ARG_STRING,   &loglevel,      _("Log level (debug, info, warning, error)"),    "level" },
     { "version",     'v',  0, G_OPTION_ARG_NONE,     &print_version, _("Print version information"),                  NULL },
+    { "synctex",     's',  0, G_OPTION_ARG_NONE,     &synctex,     _("Enable synctex support"),                     NULL },
+    { "editor-command", 'x', 0, G_OPTION_ARG_STRING, &synctex_editor, _("Synctex editor (this flag is forwarded to the synctex command)"), "cmd" },
     { NULL, '\0', 0, 0, NULL, NULL, NULL }
   };
 
@@ -144,6 +146,12 @@ zathura_init(int argc, char* argv[])
     g_free(path);
   }
 
+  /* synctex */
+  zathura->synctex.enabled = synctex;
+  if (synctex_editor) {
+    zathura->synctex.editor = g_strdup(synctex_editor);
+  }
+
   /* create zathura (config/data) directory */
   g_mkdir_with_parents(zathura->config.config_dir, 0771);
   g_mkdir_with_parents(zathura->config.data_dir,   0771);

zathura.h

@@ -66,6 +66,12 @@ struct zathura_s
     gchar* data_dir; /**< Path to the data directory */
   } config;
 
+  struct
+  {
+    bool enabled;
+    gchar* editor;
+  } synctex;
+
   struct
   {
     GtkPrintSettings* settings; /**< Print settings */