Extract several components into crates

editor-challenge/src/main.rs

@@ -1,12 +1,14 @@
+mod state;
+mod types;
+
 use crossterm::{
     event::{self, KeyCode, KeyEvent, KeyModifiers},
     terminal::{disable_raw_mode, enable_raw_mode},
 };
+use state::AppState;
 use std::{
     env,
-    fs::File,
-    io::{self, BufRead, BufReader, Read},
-    path::PathBuf,
+    io,
     sync::mpsc,
     thread,
     time::{Duration, Instant},
@@ -23,112 +25,6 @@ const TITLE: &str = "Text Editor Challenge";
 const COPYRIGHT: &str = "(c) Savanni D'Gerinel - all rights reserved";
 const TICK_RATE_MS: u64 = 200;
 
-#[derive(Default)]
-struct Document {
-    rows: Vec<String>
-}
-
-impl Document {
-    fn contents(&self) -> String {
-        self.rows.join("\n")
-    }
-
-    fn row_length(&self, idx: usize) -> usize {
-        self.rows[idx].len()
-    }
-
-    fn row_count(&self) -> usize {
-        self.rows.len()
-    }
-}
-
-#[derive(Default)]
-struct AppState {
-    path: Option<PathBuf>,
-    cursor: Cursor,
-    contents: Document, // Obviously this is bad, but it's also only temporary.
-}
-
-impl AppState {
-    fn open(path: PathBuf) -> Self {
-        let mut file = File::open(path.clone()).unwrap();
-        let mut reader = BufReader::new(file);
-        let contents = reader
-            .lines()
-            .collect::<Result<Vec<String>, std::io::Error>>()
-            .unwrap();
-
-        Self {
-            path: Some(path),
-            cursor: Default::default(),
-            contents: Document{ rows: contents },
-        }
-    }
-
-    fn cursor_up(&mut self) {
-        self.cursor.cursor_up(&self.contents);
-    }
-
-    fn cursor_down(&mut self) {
-        self.cursor.cursor_down(&self.contents);
-    }
-
-    fn cursor_right(&mut self) {
-        self.cursor.cursor_right(&self.contents);
-    }
-
-    fn cursor_left(&mut self) {
-        self.cursor.cursor_left();
-    }
-}
-
-#[derive(Default)]
-struct Cursor {
-    row: usize,
-    column: usize,
-    desired_column: usize,
-}
-
-impl Cursor {
-    fn cursor_up(&mut self, doc: &Document) {
-        if self.row > 0 {
-            self.row -= 1;
-        }
-        self.correct_columns(doc);
-    }
-
-    fn cursor_down(&mut self, doc: &Document) {
-        if self.row < doc.row_count() - 1 {
-            self.row += 1;
-        }
-        self.correct_columns(doc);
-    }
-
-    fn correct_columns(&mut self, doc: &Document) {
-        let row_len = doc.row_length(self.row);
-        if self.desired_column < row_len {
-            self.column = self.desired_column;
-        } else {
-            self.column = row_len;
-        }
-    }
-
-    fn cursor_right(&mut self, doc: &Document) {
-        if self.column < doc.row_length(self.row) {
-            self.column += 1;
-        }
-        self.desired_column = self.column;
-    }
-
-    fn cursor_left(&mut self) {
-        if self.column > 0 {
-            self.column -= 1;
-        }
-        self.desired_column = self.column;
-    }
-
-}
-
 fn render<T>(app_state: &AppState, terminal: &mut Terminal<T>) -> Result<(), anyhow::Error>
 where
     T: tui::backend::Backend,
@@ -183,8 +79,9 @@ where
         rect.render_widget(contents, chunks[1]);
 
         // TODO: keeping track of the index of the top row and subtract that from the cursor row.
-        let row = app_state.cursor.row as u16;
-        let column = app_state.cursor.column as u16;
+        let (row, column) = app_state.cursor.addr();
+        let row = row as u16;
+        let column = column as u16;
         rect.set_cursor(chunks[1].x + column, chunks[1].y + row);
     })?;
     Ok(())

editor-challenge/src/state.rs

@@ -0,0 +1,42 @@
+use crate::types::{Cursor, Document};
+use std::{fs::File, io::{BufRead, BufReader}, path::PathBuf};
+
+#[derive(Default)]
+pub struct AppState {
+    pub path: Option<PathBuf>,
+    pub cursor: Cursor,
+    pub contents: Document, // Obviously this is bad, but it's also only temporary.
+}
+
+impl AppState {
+    pub fn open(path: PathBuf) -> Self {
+        let file = File::open(path.clone()).unwrap();
+        let reader = BufReader::new(file);
+        let contents = reader
+            .lines()
+            .collect::<Result<Vec<String>, std::io::Error>>()
+            .unwrap();
+
+        Self {
+            path: Some(path),
+            cursor: Default::default(),
+            contents: Document::new(contents),
+        }
+    }
+
+    pub fn cursor_up(&mut self) {
+        self.cursor.cursor_up(&self.contents);
+    }
+
+    pub fn cursor_down(&mut self) {
+        self.cursor.cursor_down(&self.contents);
+    }
+
+    pub fn cursor_right(&mut self) {
+        self.cursor.cursor_right(&self.contents);
+    }
+
+    pub fn cursor_left(&mut self) {
+        self.cursor.cursor_left();
+    }
+}

editor-challenge/src/types.rs

@@ -0,0 +1,77 @@
+#[derive(Default)]
+pub struct Document {
+    rows: Vec<String>
+}
+
+impl Document {
+    pub fn new(contents: Vec<String>) -> Self {
+        Self{
+            rows: contents
+        }
+    }
+
+    pub fn contents(&self) -> String {
+        self.rows.join("\n")
+    }
+
+    pub fn row_length(&self, idx: usize) -> usize {
+        self.rows[idx].len()
+    }
+
+    pub fn row_count(&self) -> usize {
+        self.rows.len()
+    }
+}
+
+#[derive(Default)]
+pub struct Cursor {
+    row: usize,
+    column: usize,
+    desired_column: usize,
+}
+
+impl Cursor {
+    pub fn addr(&self) -> (usize, usize) {
+        (self.row, self.column)
+    }
+
+    pub fn cursor_up(&mut self, doc: &Document) {
+        if self.row > 0 {
+            self.row -= 1;
+        }
+        self.correct_columns(doc);
+    }
+
+    pub fn cursor_down(&mut self, doc: &Document) {
+        if self.row < doc.row_count() - 1 {
+            self.row += 1;
+        }
+        self.correct_columns(doc);
+    }
+
+    pub fn correct_columns(&mut self, doc: &Document) {
+        let row_len = doc.row_length(self.row);
+        if self.desired_column < row_len {
+            self.column = self.desired_column;
+        } else {
+            self.column = row_len;
+        }
+    }
+
+    pub fn cursor_right(&mut self, doc: &Document) {
+        if self.column < doc.row_length(self.row) {
+            self.column += 1;
+        }
+        self.desired_column = self.column;
+    }
+
+    pub fn cursor_left(&mut self) {
+        if self.column > 0 {
+            self.column -= 1;
+        }
+        self.desired_column = self.column;
+    }
+
+}
+
+