From ed6a4c4bd240630355d1c61a1c05c4e22bf62a86 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bla=C5=BE=20Hrastnik?= <blaz@mxxn.io>
Date: Mon, 14 Dec 2020 14:12:54 +0900
Subject: [PATCH] wip: Use prompt for interactive commands.

---
 helix-term/src/commands.rs  | 33 +++++++++++++++++++++++++++++++++
 helix-term/src/keymap.rs    |  1 +
 helix-term/src/ui/prompt.rs |  6 +-----
 3 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index b345d2e8b..7001aa119 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -248,6 +248,39 @@ pub fn extend_line_down(cx: &mut Context) {
     cx.view.doc.set_selection(selection);
 }
 
+pub fn split_selection(cx: &mut Context) {
+    // TODO: this needs to store initial selection state, revert on esc, confirm on enter
+    // needs to also call the callback function per input change, not just final time.
+    // could cheat and put it into completion_fn
+    //
+    // kakoune does it like this:
+    // # save state to register
+    // {
+    //  # restore state from register
+    //  # if event == abort, return early
+    //  # add to history if enabled
+    //  # update state
+    // }
+
+    let prompt = Prompt::new(
+        "split:".to_string(),
+        |input: &str| Vec::new(), // TODO: use Option here?
+        |editor: &mut Editor, input: &str| {
+            match Regex::new(input) {
+                Ok(regex) => {
+                    let view = editor.view_mut().unwrap();
+                    let text = &view.doc.text().slice(..);
+                    let selection = selection::split_on_matches(text, view.doc.selection(), &regex);
+                    view.doc.set_selection(selection);
+                }
+                Err(_) => (), // TODO: mark command line as error
+            }
+        },
+    );
+
+    unimplemented!()
+}
+
 pub fn split_selection_on_newline(cx: &mut Context) {
     let text = &cx.view.doc.text().slice(..);
     // only compile the regex once
diff --git a/helix-term/src/keymap.rs b/helix-term/src/keymap.rs
index af46f7a4d..304a173c4 100644
--- a/helix-term/src/keymap.rs
+++ b/helix-term/src/keymap.rs
@@ -156,6 +156,7 @@ pub fn default() -> Keymaps {
                 vec![key!('o')] => commands::open_below,
                 vec![key!('d')] => commands::delete_selection,
                 vec![key!('c')] => commands::change_selection,
+                vec![shift!('S')] => commands::split_selection,
                 vec![key!('s')] => commands::split_selection_on_newline,
                 vec![key!(';')] => commands::collapse_selection,
                 // TODO should be alt(;)
diff --git a/helix-term/src/ui/prompt.rs b/helix-term/src/ui/prompt.rs
index ce00a1299..d1d929751 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -10,7 +10,6 @@ pub struct Prompt {
     pub line: String,
     pub cursor: usize,
     pub completion: Vec<String>,
-    pub should_close: bool,
     pub completion_selection_index: Option<usize>,
     completion_fn: Box<dyn FnMut(&str) -> Vec<String>>,
     callback_fn: Box<dyn FnMut(&mut Editor, &str)>,
@@ -27,7 +26,6 @@ pub fn new(
             line: String::new(),
             cursor: 0,
             completion: completion_fn(""),
-            should_close: false,
             completion_selection_index: None,
             completion_fn: Box::new(completion_fn),
             callback_fn: Box::new(callback_fn),
@@ -42,9 +40,7 @@ pub fn insert_char(&mut self, c: char) {
     }
 
     pub fn move_char_left(&mut self) {
-        if self.cursor > 0 {
-            self.cursor -= 1;
-        }
+        self.cursor = self.cursor.saturating_sub(1)
     }
 
     pub fn move_char_right(&mut self) {