feat: push checkout (#14)

Reviewed-on: https://git.reya.su/reya/signed/pulls/14

crates/workspace/src/views/dialog_state.rs

@@ -0,0 +1,36 @@
+use gpui::prelude::*;
+use gpui::{AnyElement, App, SharedString, div};
+use gpui_component::ActiveTheme;
+
+/// Progress of an async dialog action: a busy flag disabling the form,
+/// and an error line shown under it.
+#[derive(Debug, Default)]
+pub struct DialogProgress {
+    pub busy: bool,
+    pub error: Option<SharedString>,
+}
+
+impl DialogProgress {
+    /// An action started, disable the form and clear the previous error.
+    pub fn begin(&mut self) {
+        self.busy = true;
+        self.error = None;
+    }
+
+    /// An action failed, re-enable the form and surface `message`.
+    pub fn fail(&mut self, message: impl Into<SharedString>) {
+        self.busy = false;
+        self.error = Some(message.into());
+    }
+}
+
+/// The shared error line under a dialog form, `None` when there is no error.
+pub fn error_row(error: &Option<SharedString>, cx: &App) -> Option<AnyElement> {
+    error.as_ref().map(|message| {
+        div()
+            .text_sm()
+            .text_color(cx.theme().danger)
+            .child(message.clone())
+            .into_any_element()
+    })
+}