From b14c258a2c447b892c89d3e68ef4c9a74effca85 Mon Sep 17 00:00:00 2001
From: Blaž Hrastnik
Date: Tue, 7 Jun 2022 00:08:47 +0900
Subject: prompt: If submitting empty prompt, use default (last used)

---
 helix-term/src/ui/mod.rs    | 19 +++++++------------
 helix-term/src/ui/prompt.rs | 26 ++++++++++++++++++++++++--
 2 files changed, 31 insertions(+), 14 deletions(-)

(limited to 'helix-term/src/ui')

diff --git a/helix-term/src/ui/mod.rs b/helix-term/src/ui/mod.rs
index 2dca870b..6dea2192 100644
--- a/helix-term/src/ui/mod.rs
+++ b/helix-term/src/ui/mod.rs
@@ -63,18 +63,8 @@ pub fn regex_prompt(
                     doc.set_selection(view.id, snapshot.clone());
                     view.offset = offset_snapshot;
                 }
-                PromptEvent::Validate => match Regex::new(input) {
-                    Ok(regex) => {
-                        let (view, doc) = current!(cx.editor);
-                        // Equivalent to push_jump to store selection just before jump
-                        view.jumps.push((doc_id, snapshot.clone()));
-                        fun(view, doc, regex, event);
-                    }
-                    Err(_err) => (), // TODO: mark command line as error
-                },
-
-                PromptEvent::Update => {
-                    // skip empty input, TODO: trigger default
+                PromptEvent::Update | PromptEvent::Validate => {
+                    // skip empty input
                     if input.is_empty() {
                         return;
                     }
@@ -96,6 +86,11 @@ pub fn regex_prompt(
                             // revert state to what it was before the last update
                             doc.set_selection(view.id, snapshot.clone());
 
+                            if event == PromptEvent::Validate {
+                                // Equivalent to push_jump to store selection just before jump
+                                view.jumps.push((doc_id, snapshot.clone()));
+                            }
+
                             fun(view, doc, regex, event);
 
                             view.ensure_cursor_in_view(doc, config.scrolloff);
diff --git a/helix-term/src/ui/prompt.rs b/helix-term/src/ui/prompt.rs
index a5be33ff..64154bae 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -442,10 +442,21 @@ impl Prompt {
         let line = area.height - 1;
         // render buffer text
         surface.set_string(area.x, area.y + line, &self.prompt, prompt_color);
+
+        let input: Cow<str> = if self.line.is_empty() {
+            // latest value in the register list
+            self.history_register
+                .and_then(|reg| cx.editor.registers.first(reg).cloned()) // TODO: can we avoid cloning?
+                .map(|entry| entry.into())
+                .unwrap_or_else(|| Cow::from(""))
+        } else {
+            self.line.as_str().into()
+        };
+
         surface.set_string(
             area.x + self.prompt.len() as u16,
             area.y + line,
-            &self.line,
+            &input,
             prompt_color,
         );
     }
@@ -510,7 +521,18 @@ impl Component for Prompt {
                     self.recalculate_completion(cx.editor);
                     self.exit_selection();
                 } else {
-                    (self.callback_fn)(cx, &self.line, PromptEvent::Validate);
+                    // handle executing with last command in history if nothing entered
+                    let input: Cow<str> = if self.line.is_empty() {
+                        // latest value in the register list
+                        self.history_register
+                            .and_then(|reg| cx.editor.registers.first(reg).cloned())
+                            .map(|entry| entry.into())
+                            .unwrap_or_else(|| Cow::from(""))
+                    } else {
+                        self.line.as_str().into()
+                    };
+
+                    (self.callback_fn)(cx, &input, PromptEvent::Validate);
 
                     if let Some(register) = self.history_register {
                         // store in history
-- 
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