Add list_operations().

2 files changed, 32 insertions, 4 deletions

diff --git a/src/gegl.rs b/src/gegl.rs
index b03fca1..0ffdf9c 100644
--- a/src/gegl.rs
+++ b/src/gegl.rs
@@ -3,6 +3,7 @@ extern crate libc;
 use gegl_ffi as ffi;
 use std::ptr;
 use std::ffi::CString;
+use std::ffi::CStr;
 
 pub struct GeglContext {
     _private: ()
@@ -46,15 +47,36 @@ impl Drop for GeglNode {
     }
 }
 
+pub fn list_operations() -> Vec<String> {
+    let mut num_operations: usize = 0;
+    let mut result = vec!();
+    unsafe {
+        let operations =
+            ffi::gegl_list_operations(&mut num_operations as *mut _);
+        for i in 0..(num_operations as isize) {
+            result.push(CStr::from_ptr(*operations.offset(i))
+                        .to_string_lossy().to_string());
+        }
+        ffi::g_free(operations as *mut libc::c_void);
+    }
+    result
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
     use gegl_ffi as ffi;
 
     #[test]
-    fn can_create_nodes() {
+    fn implements_all_operations() {
         let context = GeglContext::new();
-        let node = context.new_node();
-        let node2 = context.new_node();
+        assert_eq!(Vec::<String>::new(), list_operations());
     }
+
+    // #[test]
+    // fn can_create_nodes() {
+    //     let context = GeglContext::new();
+    //     context.new_node();
+    //     context.new_node();
+    // }
 }
diff --git a/src/gegl_ffi.rs b/src/gegl_ffi.rs
index 093fc3b..a477603 100644
--- a/src/gegl_ffi.rs
+++ b/src/gegl_ffi.rs
@@ -25,10 +25,16 @@ extern {
     pub fn gegl_node_link(source: *mut CGeglNode,
                           sink: *mut CGeglNode);
     pub fn gegl_node_process(node: *mut CGeglNode);
-    pub fn g_object_unref(object: *mut libc::c_void);
     pub fn gegl_exit();
     pub fn gegl_buffer_new(extent: *mut libc::c_void, format: *mut libc::c_void)
                            -> *mut GeglBuffer;
     pub fn gegl_buffer_get_extent(buffer: *const libc::c_void) ->
         *const GeglRectangle;
+
+
+    pub fn g_object_unref(object: *mut libc::c_void);
+    pub fn g_free(object: *mut libc::c_void);
+
+    pub fn gegl_list_operations(num_operations: *mut usize)
+                                -> *mut *const libc::c_char;
 }