Remove more unused functions

Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>

utils.c

@@ -23,21 +23,6 @@
 #include "page.h"
 #include "plugin.h"
 
-const char*
-file_get_extension(const char* path)
-{
-  if (path == NULL) {
-    return NULL;
-  }
-
-  const char* res = strrchr(path, '.');
-  if (res == NULL) {
-    return NULL;
-  }
-
-  return res + 1;
-}
-
 bool
 file_valid_extension(zathura_t* zathura, const char* path)
 {
@@ -87,17 +72,6 @@ document_index_build(GtkTreeModel* model, GtkTreeIter* parent,
   GIRARA_LIST_FOREACH_END(list, gchar*, iter, name);
 }
 
-void
-page_calculate_offset(zathura_t* zathura, zathura_page_t* page, page_offset_t* offset)
-{
-  g_return_if_fail(page != NULL);
-  g_return_if_fail(offset != NULL);
-  GtkWidget* widget = zathura_page_get_widget(zathura, page);
-
-  g_return_if_fail(gtk_widget_translate_coordinates(widget,
-                   zathura->ui.page_widget, 0, 0, &(offset->x), &(offset->y)) == true);
-}
-
 zathura_rectangle_t
 rotate_rectangle(zathura_rectangle_t rectangle, unsigned int degree, double height, double width)
 {

utils.h

@@ -17,14 +17,6 @@ typedef struct page_offset_s
   int y;
 } page_offset_t;
 
-/**
- * Returns the file extension of a path
- *
- * @param path Path to the file
- * @return The file extension or NULL
- */
-const char* file_get_extension(const char* path);
-
 /**
  * This function checks if the file has a valid extension. A extension is
  * evaluated as valid if it matches a supported filetype.
@@ -35,15 +27,6 @@ const char* file_get_extension(const char* path);
  */
 bool file_valid_extension(zathura_t* zathura, const char* path);
 
-/**
- * Executes a system command and saves its output into output
- *
- * @param argv The command
- * @param output Pointer where the output will be saved
- * @return true if no error occured, otherwise false
- */
-bool execute_command(char* const argv[], char** output);
-
 /**
  * Generates the document index based upon the list retreived from the document
  * object.
@@ -54,17 +37,6 @@ bool execute_command(char* const argv[], char** output);
  */
 void document_index_build(GtkTreeModel* model, GtkTreeIter* parent, girara_tree_node_t* tree);
 
-/**
- * Calculates the offset of the page to the top of the viewing area as
- * well as to the left side of it. The result has to be freed.
- *
- * @param zathura Zathura session
- * @param page The Page
- * @param offset Applied offset
- * @return The calculated offset or NULL if an error occured
- */
-void page_calculate_offset(zathura_t* zathura, zathura_page_t* page, page_offset_t* offset);
-
 /**
  * Rotate a rectangle by 0, 90, 180 or 270 degree
  *