From 68bd6c2dfb0ed593c5e6deebe1d9753db90f03e1 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Thu, 18 Mar 2021 21:04:00 +0530
Subject: render cursor to command box, add readline keybinds

---
 src/app.rs     | 33 ++++++++++++++++++++++++++++-----
 src/command.rs | 45 ++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 70 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/app.rs b/src/app.rs
index 9ba93f4..3571436 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1,7 +1,7 @@
 use crate::{
     bitmap::{MapPoint, Pixmap},
     command::CommandBox,
-    consts::colors::*,
+    consts::{colors::*, FONT_PATH},
     dither, rect,
     symmetry::Symmetry,
     undo::{ModifyRecord, OpKind, Operation, UndoStack},
@@ -352,6 +352,20 @@ impl<'ctx> AppState<'ctx> {
             BLACK,
             (0, winsize_y - cmd_height),
         );
+
+        self.canvas.set_draw_color(PINK);
+        let mut font = self.ttf_context.load_font(FONT_PATH, 17).unwrap();
+        font.set_style(sdl2::ttf::FontStyle::NORMAL);
+        font.set_hinting(sdl2::ttf::Hinting::Mono);
+        let prev_text = &self.command_box.text[..self.command_box.cursor];
+        let prev_text_dim = font.size_of_latin1(prev_text.as_bytes()).unwrap();
+        let cursor = rect!(
+            prev_text_dim.0,
+            winsize_y - cmd_height + 2,
+            2,
+            cmd_height - 4
+        );
+        self.canvas.fill_rect(cursor).unwrap();
     }
 
     fn draw_mouse(&mut self) {
@@ -641,7 +655,9 @@ impl<'ctx> AppState<'ctx> {
                             }
                         }
                         if let Event::KeyDown {
-                            keycode: Some(k), ..
+                            keycode: Some(k),
+                            keymod,
+                            ..
                         } = event
                         {
                             match k {
@@ -651,9 +667,16 @@ impl<'ctx> AppState<'ctx> {
                                 Keycode::Right => self.command_box.forward(),
                                 Keycode::Up => self.command_box.hist_prev(),
                                 Keycode::Down => self.command_box.hist_next(),
-                                Keycode::Return => {
-                                    self.eval_command();
-                                }
+                                _ if keymod == Mod::LCTRLMOD => match k {
+                                    Keycode::A => self.command_box.cursor_start(),
+                                    Keycode::E => self.command_box.cursor_end(),
+                                    Keycode::F => self.command_box.forward(),
+                                    Keycode::B => self.command_box.backward(),
+                                    Keycode::K => self.command_box.delete_to_end(),
+                                    Keycode::U => self.command_box.delete_to_start(),
+                                    _ => (),
+                                },
+                                Keycode::Return => self.eval_command(),
                                 Keycode::Escape => {
                                     self.command_box.clear();
                                     self.mode = Mode::Draw;
diff --git a/src/command.rs b/src/command.rs
index 064d767..d80f1f2 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -22,11 +22,11 @@ impl CommandBox {
         }
     }
 
-    fn cursor_end(&mut self) {
+    pub fn cursor_end(&mut self) {
         self.cursor = self.text.len();
     }
 
-    fn cursor_start(&mut self) {
+    pub fn cursor_start(&mut self) {
         self.cursor = 0;
     }
 
@@ -47,8 +47,17 @@ impl CommandBox {
         }
     }
 
+    pub fn delete_to_end(&mut self) {
+        self.text.truncate(self.cursor);
+    }
+
+    pub fn delete_to_start(&mut self) {
+        self.text = self.text.chars().skip(self.cursor).collect();
+        self.cursor = 0;
+    }
+
     pub fn push_str(&mut self, v: &str) {
-        self.text.push_str(v);
+        self.text.insert_str(self.cursor, v);
         self.cursor += v.len();
     }
 
@@ -142,6 +151,36 @@ mod command_tests {
         assert_eq!(cmd.cursor, 16)
     }
 
+    #[test]
+    fn entering_text_between() {
+        let mut cmd = setup_with("save as file.png");
+        cmd.backward();
+        cmd.backward();
+        cmd.backward();
+        cmd.push_str("ext");
+        assert_eq!(&cmd.text, "save as file.extpng");
+    }
+
+    #[test]
+    fn delete_to_end() {
+        let mut cmd = setup_with("save as file.png");
+        cmd.backward();
+        cmd.backward();
+        cmd.backward();
+        cmd.delete_to_end();
+        assert_eq!(&cmd.text, "save as file.");
+    }
+
+    #[test]
+    fn delete_to_start() {
+        let mut cmd = setup_with("save as file.png");
+        cmd.backward();
+        cmd.backward();
+        cmd.backward();
+        cmd.delete_to_start();
+        assert_eq!(&cmd.text, "png");
+    }
+
     #[test]
     fn backspacing_from_end() {
         let mut cmd = setup_with("save");
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