Added support for NFD_PickFolder

* Notice this currently uses the devel branch of on NFD. I’m not sure we want to use this or not but I wanted to PickFolder support for my own use case.

Author: emoon

examples/pick_folder.rs

@@ -0,0 +1,39 @@
+
+/*
+Copyright (c) 2016 Saurav Sachidanand
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+extern crate nfd;
+
+use nfd::Response;
+
+fn main() {
+    let result = nfd::open_pick_folder(None).unwrap_or_else(|e| {
+        panic!(e);
+    });
+
+    match result {
+        Response::Okay(file_path) => println!("File path = {:?}", file_path),
+        Response::Cancel => println!("User canceled"),
+        _ => (),
+    }
+}
+

nativefiledialog

@@ -53,6 +53,7 @@ extern "C" {
     pub fn NFD_OpenDialog(filterList: *const nfdchar_t, defaultPath: *const nfdchar_t, outPath: *mut *mut nfdchar_t) -> nfdresult_t;
     pub fn NFD_OpenDialogMultiple(filterList: *const nfdchar_t, defaultPath: *const nfdchar_t, outPaths: *mut nfdpathset_t) -> nfdresult_t;
     pub fn NFD_SaveDialog(filterList: *const nfdchar_t, defaultPath: *const nfdchar_t, outPath: *mut *mut nfdchar_t) -> nfdresult_t;
+    pub fn NFD_PickFolder(defaultPath: *const nfdchar_t, outPath: *mut *mut nfdchar_t) -> nfdresult_t;
     pub fn NFD_GetError() -> *const raw::c_char;
     pub fn NFD_PathSet_GetCount(pathSet: *const nfdpathset_t) -> size_t;
     pub fn NFD_PathSet_GetPath(pathSet: *const nfdpathset_t, index: size_t) -> *mut nfdchar_t;

src/ffi.rs

@@ -43,6 +43,7 @@ pub enum DialogType {
     SingleFile,
     MultipleFiles,
     SaveFile,
+    PickFolder,
 }
 
 pub struct DialogBuilder<'a> {
@@ -105,6 +106,11 @@ pub fn open_save_dialog(filter_list: Option<&str>, default_path: Option<&str>) -
     open_dialog(filter_list, default_path, DialogType::SaveFile)
 }
 
+/// Open save dialog
+pub fn open_pick_folder(default_path: Option<&str>) -> Result<Response> {
+    open_dialog(None, default_path, DialogType::PickFolder)
+}
+
 pub fn open_dialog(filter_list: Option<&str>, default_path: Option<&str>, dialog_type: DialogType) -> Result<Response> {
     let result;
     let filter_list_cstring;
@@ -145,11 +151,16 @@ pub fn open_dialog(filter_list: Option<&str>, default_path: Option<&str>, dialog
             DialogType::SaveFile => {
                 NFD_SaveDialog(filter_list_ptr, default_path_ptr, ptr_out_path)
             },
+
+            DialogType::PickFolder => {
+                NFD_PickFolder(default_path_ptr, ptr_out_path)
+            },
         };
 
         match result {
             nfdresult_t::NFD_OKAY =>{
-                if dialog_type == DialogType::SingleFile {
+                if dialog_type == DialogType::SingleFile || 
+                   dialog_type == DialogType::PickFolder {
                     Ok(Response::Okay(CStr::from_ptr(out_path).to_string_lossy().into_owned()))
                 } else {
                     let count = NFD_PathSet_GetCount(&out_multiple);