From e0ad77fb0d516c88b4cb752f936a0da13afe0f8f Mon Sep 17 00:00:00 2001
From: Austen Adler <agadler@austenadler.com>
Date: Thu, 15 Dec 2022 23:03:57 -0500
Subject: [PATCH] Initial code

---
 .gitignore  |   1 +
 Cargo.lock  | 302 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  11 ++
 src/main.rs | 223 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 537 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..afb2ca3
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,302 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+
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+ "libc",
+ "winapi",
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+
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+ "libc",
+ "mio",
+ "parking_lot",
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+ "winapi",
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+]
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+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a46b838
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "live-cli"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tui = "0.19"
+crossterm = "0.25"
+atty = "0.2.14"
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b798b3a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,223 @@
+// Easy mode
+#![allow(dead_code, unused_imports)]
+// Hard mode
+#![warn(clippy::all, clippy::pedantic, clippy::nursery)]
+// #![allow(clippy::cast_possible_truncation, clippy::multiple_crate_versions)]
+
+use std::{
+    io::{self, Write},
+    process::{Command, Stdio},
+    sync::Arc,
+    thread,
+    time::Duration,
+};
+use tui::{
+    backend::{Backend, CrosstermBackend},
+    layout::{Constraint, Direction, Layout, Rect},
+    widgets::{Block, Borders, Paragraph, Widget},
+    Frame, Terminal,
+};
+
+use crossterm::{
+    event::{self, DisableMouseCapture, EnableMouseCapture, Event, KeyCode},
+    execute,
+    terminal::{disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen},
+};
+
+struct CommandResult {
+    pub status_success: bool,
+    pub stdout: String,
+    pub stderr: String,
+}
+
+impl Default for CommandResult {
+    fn default() -> Self {
+        Self {
+            status_success: true,
+            stdout: String::default(),
+            stderr: String::default(),
+        }
+    }
+}
+
+/// The state of the application
+struct App {
+    /// The line the user inputs
+    cmdline: String,
+
+    /// Original text
+    text_orig: Arc<String>,
+
+    command_result: CommandResult,
+
+    /// Transformed text
+    // text_transformed: String,
+    // text_transformed_stderr: String,
+
+    /// Should every keystroke transform the original text?
+    autorun: bool,
+}
+
+impl App {
+    pub fn new_with_input(input: String) -> Self {
+        Self {
+            cmdline: String::from(""),
+            text_orig: Arc::new(input),
+            command_result: CommandResult::default(),
+            // text_transformed: String::from(""),
+            autorun: true,
+        }
+    }
+}
+
+fn main() -> Result<(), io::Error> {
+    if atty::is(atty::Stream::Stdin) {
+        return Err(io::Error::new(
+            io::ErrorKind::Other,
+            "You must send stdin to this command",
+        ));
+    }
+
+    enable_raw_mode()?;
+    let mut stdout = io::stdout();
+    // execute!(stdout, EnterAlternateScreen, EnableMouseCapture)?;
+    execute!(stdout, EnterAlternateScreen)?;
+    let backend = CrosstermBackend::new(stdout);
+    let mut terminal = Terminal::new(backend)?;
+
+    // Slurp all input
+    let text_orig = io::read_to_string(io::stdin())?;
+
+    // Run the actual application
+    let app = App::new_with_input(text_orig);
+    let _res = run_app(&mut terminal, app);
+
+    // Restore terminal
+    disable_raw_mode()?;
+    execute!(
+        terminal.backend_mut(),
+        LeaveAlternateScreen,
+        DisableMouseCapture
+    )?;
+    terminal.show_cursor()?;
+
+    Ok(())
+}
+
+fn run_app<B: Backend>(terminal: &mut Terminal<B>, mut app: App) -> io::Result<()> {
+    loop {
+        terminal.draw(|f| ui(f, &app))?;
+
+        if let Event::Key(key) = event::read()? {
+            match key.code {
+                KeyCode::Esc => {
+                    return Ok(());
+                }
+                KeyCode::Char(c) => {
+                    app.cmdline.push(c);
+                    if app.autorun {
+                        run_command(&mut app);
+                    }
+                }
+                KeyCode::Backspace => {
+                    app.cmdline.pop();
+                    if app.autorun {
+                        run_command(&mut app);
+                    }
+                }
+                KeyCode::Enter => {}
+                _ => {}
+            }
+        }
+    }
+}
+
+fn run_command(app: &mut App) {
+    let mut child = Command::new("jq")
+        .arg("-C")
+        .arg(&app.cmdline)
+        .stdin(Stdio::piped())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped())
+        .spawn()
+        .expect("Could not spawn child process");
+
+    let mut stdin = child.stdin.take().expect("Could not take stdin");
+    let text_orig_clone = app.text_orig.clone();
+    std::thread::spawn(move || {
+        stdin
+            .write_all(text_orig_clone.as_bytes())
+            .expect("Failed to write to stdin")
+    });
+
+    // Collect the output
+    let output = child.wait_with_output().expect("Failed to read stdout");
+
+    let stderr_string = String::from_utf8_lossy(&output.stderr).to_string();
+    let stdout_string = String::from_utf8_lossy(&output.stdout).to_string();
+
+    app.command_result = CommandResult {
+        status_success: output.status.success(),
+        stdout: stdout_string,
+        stderr: stderr_string,
+    }
+}
+
+fn ui<B: Backend>(f: &mut Frame<B>, app: &App) {
+    let vertical_chunks = Layout::default()
+        .direction(Direction::Vertical)
+        .margin(2)
+        .constraints([Constraint::Min(3), Constraint::Length(3)].as_ref())
+        .split(f.size());
+
+    let chunks = Layout::default()
+        .direction(Direction::Horizontal)
+        .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())
+            .block(Block::default().title("Orig").borders(Borders::ALL)),
+        chunks[0],
+    );
+    f.render_widget(
+        Paragraph::new(app.cmdline.as_ref())
+            .block(Block::default().title("Cmdline").borders(Borders::ALL)),
+        vertical_chunks[1],
+    );
+
+    // Render the output in the outpout region
+    ui_output(f, chunks[1], app);
+
+    f.set_cursor(
+        vertical_chunks[1].x + app.cmdline.len() as u16 + 1,
+        vertical_chunks[1].y + 1,
+    )
+}
+
+fn ui_output<B: Backend>(f: &mut Frame<B>, output_region: Rect, app: &App) {
+    if app.command_result.status_success {
+        f.render_widget(
+            Paragraph::new(app.command_result.stdout.as_ref())
+                .block(Block::default().title("New").borders(Borders::ALL)),
+            output_region,
+        );
+    } else {
+        let chunks = Layout::default()
+            .direction(Direction::Vertical)
+            .constraints([Constraint::Percentage(50), Constraint::Percentage(50)])
+            .split(output_region);
+
+        f.render_widget(
+            Paragraph::new(app.command_result.stdout.as_ref())
+                .block(Block::default().title("Output").borders(Borders::ALL)),
+            chunks[0],
+        );
+        f.render_widget(
+            Paragraph::new(app.command_result.stderr.as_ref())
+                .block(Block::default().title("Error").borders(Borders::ALL)),
+            chunks[1],
+        );
+    }
+}