From 5ece5b719863ab795b7da6c668f839fbbcbe9f99 Mon Sep 17 00:00:00 2001
From: CrispyPin <crispin@tasa.se>
Date: Wed, 1 Mar 2023 22:16:10 +0100
Subject: [PATCH] add clipboard

---
 src/clipboard.rs | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/editor.rs    | 45 ++++++++++++++++++++++++++++++++++++++++++---
 src/main.rs      | 19 ++++++++++++++-----
 3 files changed, 98 insertions(+), 8 deletions(-)
 create mode 100644 src/clipboard.rs

diff --git a/src/clipboard.rs b/src/clipboard.rs
new file mode 100644
index 0000000..d9594b4
--- /dev/null
+++ b/src/clipboard.rs
@@ -0,0 +1,42 @@
+use std::{cell::RefCell, rc::Rc};
+
+#[derive(Clone)]
+pub struct Clipboard {
+	clipboard: Rc<RefCell<Internal>>,
+}
+
+impl Clipboard {
+	pub fn new() -> Self {
+		Self {
+			clipboard: Rc::new(RefCell::new(Internal::new())),
+		}
+	}
+
+	pub fn get(&self) -> String {
+		self.clipboard.borrow().get().to_owned()
+	}
+
+	pub fn set(&mut self, text: String) {
+		self.clipboard.borrow_mut().set(text);
+	}
+}
+
+struct Internal {
+	contents: String,
+}
+
+impl Internal {
+	fn new() -> Self {
+		Self {
+			contents: String::new(),
+		}
+	}
+
+	fn get(&self) -> &str {
+		&self.contents
+	}
+
+	fn set(&mut self, text: String) {
+		self.contents = text;
+	}
+}
diff --git a/src/editor.rs b/src/editor.rs
index 6d8ae98..31b847c 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -11,6 +11,7 @@ use termion::{
 	terminal_size,
 };
 
+use crate::clipboard::Clipboard;
 use crate::util::read_line;
 
 const TAB_SIZE: usize = 4;
@@ -21,6 +22,7 @@ pub struct Editor {
 	scroll: usize,
 	cursor: Cursor,
 	marker: Option<usize>,
+	clipboard: Clipboard,
 	path: Option<String>,
 	active: bool,
 }
@@ -35,7 +37,7 @@ struct Cursor {
 type Line = Range<usize>;
 
 impl Editor {
-	pub fn new(path: String) -> Self {
+	pub fn new(clipboard: Clipboard, path: String) -> Self {
 		let text = fs::read_to_string(&path).unwrap_or_default();
 		let mut this = Editor {
 			text,
@@ -43,6 +45,7 @@ impl Editor {
 			scroll: 0,
 			cursor: Cursor { line: 0, column: 0 },
 			marker: None,
+			clipboard,
 			path: Some(path),
 			active: false,
 		};
@@ -50,13 +53,14 @@ impl Editor {
 		this
 	}
 
-	pub fn new_empty() -> Self {
+	pub fn new_empty(clipboard: Clipboard) -> Self {
 		Editor {
 			text: String::new(),
 			lines: vec![0..0],
 			scroll: 0,
 			cursor: Cursor { line: 0, column: 0 },
 			marker: None,
+			clipboard,
 			path: None,
 			active: false,
 		}
@@ -91,6 +95,9 @@ impl Editor {
 					Key::End => self.move_end(),
 					Key::Ctrl('s') => self.save(),
 					Key::Ctrl('p') => self.toggle_marker(),
+					Key::Ctrl('c') => self.copy(),
+					Key::Ctrl('x') => self.cut(),
+					Key::Ctrl('v') => self.paste(),
 					_ => (),
 				}
 			}
@@ -129,7 +136,7 @@ impl Editor {
 					if char == '\t' {
 						print!("{:1$}", " ", TAB_SIZE);
 					} else {
-						print!("{}", char);
+						print!("{char}");
 					}
 				}
 				color_reset();
@@ -272,6 +279,38 @@ impl Editor {
 		}
 	}
 
+	fn copy(&mut self) {
+		let cursor = self.char_index();
+		let range = if let Some(marker) = self.marker {
+			marker.min(cursor)..marker.max(cursor)
+		} else {
+			self.current_line().clone()
+		};
+		let text = self.text[range].to_owned();
+		self.clipboard.set(text);
+	}
+
+	fn cut(&mut self) {
+		let cursor = self.char_index();
+		let range = if let Some(marker) = self.marker {
+			marker.min(cursor)..marker.max(cursor)
+		} else {
+			self.current_line().clone()
+		};
+		let text = self.text[range.clone()].to_owned();
+		self.clipboard.set(text);
+		self.text = self.text[..range.start].to_owned() + &self.text[range.end..];
+		self.find_lines();
+		self.marker = None;
+	}
+
+	fn paste(&mut self) {
+		let cursor = self.char_index();
+		self.text.insert_str(cursor, &self.clipboard.get());
+		self.find_lines();
+		// TODO move cursor to end
+	}
+
 	/// Byte position of current character. May be text.len if cursor is at the end of the file
 	fn char_index(&self) -> usize {
 		self.current_line().start + self.cursor.column
diff --git a/src/main.rs b/src/main.rs
index f1228e7..8c98bde 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,8 +11,10 @@ use termion::{
 	raw::{IntoRawMode, RawTerminal},
 };
 
+mod clipboard;
 mod editor;
 mod util;
+use clipboard::Clipboard;
 use editor::Editor;
 
 fn main() {
@@ -22,18 +24,25 @@ fn main() {
 struct Navigator {
 	editors: Vec<Editor>,
 	selected: Option<usize>,
-	path: String,
+	clipboard: Clipboard,
 	_term: RawTerminal<Stdout>,
 }
 
 impl Navigator {
 	fn new() -> Self {
 		let term = stdout().into_raw_mode().unwrap();
-		let editors = env::args().skip(1).map(Editor::new).collect();
+		let clipboard = Clipboard::new();
+		let mut editors: Vec<Editor> = env::args()
+			.skip(1)
+			.map(|path| Editor::new(clipboard.clone(), path))
+			.collect();
+		if editors.is_empty() {
+			editors.push(Editor::new_empty(clipboard.clone()));
+		}
 		Self {
 			editors,
 			selected: Some(0),
-			path: String::new(),
+			clipboard,
 			_term: term,
 		}
 	}
@@ -72,7 +81,7 @@ impl Navigator {
 		for event in stdin().events().take(1).flatten() {
 			if let Event::Key(key) = event {
 				match key {
-					Key::Esc => self.quit(),
+					Key::Char('q') => self.quit(),
 					Key::Char('\n') => self.open_selected(),
 					Key::Ctrl('n') => self.new_editor(),
 					Key::Up => self.nav_up(),
@@ -105,7 +114,7 @@ impl Navigator {
 
 	fn new_editor(&mut self) {
 		self.selected = Some(self.editors.len());
-		self.editors.push(Editor::new_empty());
+		self.editors.push(Editor::new_empty(self.clipboard.clone()));
 		self.open_selected();
 	}