Improve commands

src/main.rs

@@ -38,6 +38,9 @@ pub struct App<'a> {
     /// The line the user inputs
     cmdline: String,
 
+    /// The position of the cursor
+    cmdline_position: u16,
+
     /// Original text
     text_orig: Arc<String>,
 
@@ -46,9 +49,6 @@ pub struct App<'a> {
 
     /// Should every keystroke transform the original text?
     autorun: bool,
-
-    /// Should this command be run when the program starts
-    run_initial: bool,
 }
 
 impl App<'_> {
@@ -57,43 +57,62 @@ impl App<'_> {
         let text_orig = Arc::new(input);
         let command_result = CommandResult::default();
         let hidden_command = template.command();
+        let cmdline_position = 0;
 
         match template {
             Template::Generic(_) => Self {
                 cmdline: String::new(),
+                cmdline_position,
                 text_orig,
                 command_result: CommandResult::default(),
                 autorun: true,
                 hidden_command,
                 hidden_options: vec![],
-                run_initial: true,
             },
             Template::Jq => Self {
-                cmdline: String::from("."),
+                cmdline: String::from("'.'"),
+                cmdline_position: 2,
                 text_orig,
                 command_result,
                 autorun: true,
                 hidden_command,
                 hidden_options: vec!["-C"],
-                run_initial: true,
             },
             Template::Grep | Template::Rg => Self {
-                cmdline: String::new(),
+                cmdline: String::from("'^'"),
+                cmdline_position: 2,
                 text_orig,
                 command_result: CommandResult::default(),
                 autorun: true,
                 hidden_command,
                 hidden_options: vec!["--color=always"],
-                run_initial: false,
             },
-            Template::Sed | Template::Awk => Self {
-                cmdline: String::new(),
+            Template::Sed => Self {
+                cmdline: String::from("'s///g'"),
+                cmdline_position: 3_u16,
                 text_orig,
                 command_result: CommandResult::default(),
                 autorun: true,
                 hidden_command,
                 hidden_options: vec![],
-                run_initial: false,
+            },
+            Template::Awk => Self {
+                cmdline: String::new(),
+                cmdline_position,
+                text_orig,
+                command_result: CommandResult::default(),
+                autorun: true,
+                hidden_command,
+                hidden_options: vec![],
+            },
+            Template::Perl => Self {
+                cmdline: String::from("'s/./_/'"),
+                cmdline_position: 3_u16,
+                text_orig,
+                command_result: CommandResult::default(),
+                autorun: true,
+                hidden_command,
+                hidden_options: vec!["-p", "-e"],
             },
         }
     }
@@ -106,6 +125,7 @@ pub enum Template {
     Rg,
     Sed,
     Awk,
+    Perl,
 }
 
 impl Template {
@@ -115,6 +135,8 @@ impl Template {
             "grep" => Self::Grep,
             "rg" => Self::Rg,
             "sed" => Self::Sed,
+            "awk" => Self::Awk,
+            "perl" => Self::Perl,
             c => Self::Generic(c.to_string()),
         }
     }
@@ -127,6 +149,7 @@ impl Template {
             Template::Rg => String::from("rg"),
             Template::Sed => String::from("sed"),
             Template::Awk => String::from("awk"),
+            Template::Perl => String::from("perl"),
         }
     }
 }
@@ -170,10 +193,14 @@ fn main() -> Result<()> {
 }
 
 fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut app: App) -> io::Result<Option<String>> {
-    if app.run_initial {
+    if !app.cmdline.is_empty() {
         command::run(&mut app);
     }
 
+    if app.cmdline_position == 0 {
+        app.cmdline_position = app.cmdline.len() as u16;
+    }
+
     loop {
         terminal.draw(|f| ui(f, &app))?;
 
@@ -183,20 +210,49 @@ fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut app: App) -> io::Result<O
                     return Ok(None);
                 }
                 KeyCode::Char(c) => {
-                    app.cmdline.push(c);
+                    app.cmdline.insert(app.cmdline_position as usize, c);
+                    app.cmdline_position = app.cmdline_position.saturating_add(1);
                     if app.autorun {
                         command::run(&mut app);
                     }
                 }
                 KeyCode::Backspace => {
-                    app.cmdline.pop();
+                    if app.cmdline_position > 0 {
+                        app.cmdline_position = app.cmdline_position.saturating_sub(1);
+                        app.cmdline.remove(app.cmdline_position as usize);
+                    }
+
                     if app.autorun {
                         command::run(&mut app);
                     }
                 }
+                KeyCode::Delete => {
+                    if (app.cmdline_position as usize) < app.cmdline.len() {
+                        app.cmdline.remove(app.cmdline_position as usize);
+                    }
+
+                    if app.autorun {
+                        command::run(&mut app);
+                    }
+                }
+                KeyCode::End => {
+                    app.cmdline_position = app.cmdline.len() as u16;
+                }
+                KeyCode::Home => {
+                    app.cmdline_position = 0_u16;
+                }
                 KeyCode::Enter => {
                     return Ok(Some(app.cmdline.clone()));
                 }
+                KeyCode::Left => {
+                    app.cmdline_position = app.cmdline_position.saturating_sub(1);
+                }
+                KeyCode::Right => {
+                    app.cmdline_position = std::cmp::min(
+                        app.cmdline.len() as u16,
+                        app.cmdline_position.saturating_add(1),
+                    );
+                }
                 _ => {}
             }
         }
@@ -214,9 +270,8 @@ fn ui<B: Backend>(f: &mut Frame<B>, app: &App) {
         .constraints([Constraint::Percentage(50), Constraint::Percentage(50)].as_ref())
         .split(vertical_chunks[0]);
 
-    // TODO: Get rid of this allocation
     f.render_widget(
-        Paragraph::new(app.text_orig.to_string())
+        Paragraph::new(app.text_orig.as_str())
             .block(Block::default().title("Orig").borders(Borders::ALL)),
         chunks[0],
     );
@@ -230,7 +285,7 @@ fn ui<B: Backend>(f: &mut Frame<B>, app: &App) {
     ui_output(f, chunks[1], app);
 
     f.set_cursor(
-        vertical_chunks[1].x + app.cmdline.len() as u16 + 1,
+        vertical_chunks[1].x + app.cmdline_position + 1,
         vertical_chunks[1].y + 1,
     );
 }