Implement File > Open menu item

gpui/src/platform/mac/app.rs

@@ -1,9 +1,13 @@
 use super::{BoolExt as _, Dispatcher, FontSystem, Window};
 use crate::{executor, platform};
 use anyhow::Result;
-use cocoa::{appkit::NSApplication, base::nil};
+use cocoa::{
+    appkit::{NSApplication, NSOpenPanel, NSModalResponse},
+    base::nil,
+    foundation::{NSArray, NSString, NSURL},
+};
 use objc::{msg_send, sel, sel_impl};
-use std::{rc::Rc, sync::Arc};
+use std::{path::PathBuf, rc::Rc, sync::Arc};
 
 pub struct App {
     dispatcher: Arc<Dispatcher>,
@@ -39,6 +43,37 @@ impl platform::App for App {
         Ok(Box::new(Window::open(options, executor, self.fonts())?))
     }
 
+    fn prompt_for_paths(
+        &self,
+        options: platform::PathPromptOptions,
+    ) -> Option<Vec<std::path::PathBuf>> {
+        unsafe {
+            let panel = NSOpenPanel::openPanel(nil);
+            panel.setCanChooseDirectories_(options.directories.to_objc());
+            panel.setCanChooseFiles_(options.files.to_objc());
+            panel.setAllowsMultipleSelection_(options.multiple.to_objc());
+            panel.setResolvesAliases_(false.to_objc());
+            let response = panel.runModal();
+            if response == NSModalResponse::NSModalResponseOk {
+                let mut result = Vec::new();
+                let urls = panel.URLs();
+                for i in 0..urls.count() {
+                    let url = urls.objectAtIndex(i);
+                    let string = url.absoluteString();
+                    let string = std::ffi::CStr::from_ptr(string.UTF8String())
+                        .to_string_lossy()
+                        .to_string();
+                    if let Some(path) = string.strip_prefix("file://") {
+                        result.push(PathBuf::from(path));
+                    }
+                }
+                Some(result)
+            } else {
+                None
+            }
+        }
+    }
+
     fn fonts(&self) -> Arc<dyn platform::FontSystem> {
         self.fonts.clone()
     }

gpui/src/platform/mod.rs

@@ -41,6 +41,7 @@ pub trait App {
         options: WindowOptions,
         executor: Rc<executor::Foreground>,
     ) -> Result<Box<dyn Window>>;
+    fn prompt_for_paths(&self, options: PathPromptOptions) -> Option<Vec<PathBuf>>;
     fn fonts(&self) -> Arc<dyn FontSystem>;
     fn quit(&self);
 }
@@ -66,6 +67,12 @@ pub struct WindowOptions<'a> {
     pub title: Option<&'a str>,
 }
 
+pub struct PathPromptOptions {
+    pub files: bool,
+    pub directories: bool,
+    pub multiple: bool,
+}
+
 pub trait FontSystem: Send + Sync {
     fn load_family(&self, name: &str) -> anyhow::Result<Vec<FontId>>;
     fn select_font(

gpui/src/platform/test.rs

@@ -48,6 +48,10 @@ impl super::App for App {
     }
 
     fn quit(&self) {}
+
+    fn prompt_for_paths(&self, _: super::PathPromptOptions) -> Option<Vec<std::path::PathBuf>> {
+        None
+    }
 }
 
 impl Window {