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use std::{
io::{stdin, stdout, BufRead, Write},
path::Path,
process::{self, Command, Output, Stdio},
};
use crossterm::{
cursor,
event::{self, Event, KeyCode},
style::{Attribute, Color, SetForegroundColor},
terminal::{self, ClearType},
};
use phf::phf_ordered_map;
mod branch;
pub mod parse;
mod status;
use branch::BranchList;
use status::Status;
#[derive(PartialEq)]
enum State {
Status,
Commit,
Branch,
}
static COMMIT_CMDS: phf::OrderedMap<char, &str> = phf_ordered_map! {
'c' => "commit",
'e' => "extend",
'a' => "amend",
};
pub fn git_process(args: &[&str]) -> Output {
Command::new("git").args(args).output().unwrap_or_else(|_| {
panic!(
"failed to run `git{}`",
args.iter().map(|a| " ".to_string() + a).collect::<String>()
)
})
}
fn main() {
clap::command!()
.color(clap::ColorChoice::Never)
.get_matches();
let top_level_stdout = git_process(&["rev-parse", "--show-toplevel"]).stdout;
let top_level_stdout = Path::new(
std::str::from_utf8(&top_level_stdout)
.expect("`git rev-parse` did not give valid utf-8")
.trim_end(),
);
if top_level_stdout.is_dir() {
std::env::set_current_dir(top_level_stdout).expect("failed to set working directory");
} else {
print!("Not a git repository. Initialise one? [y/N]");
let _ = stdout().flush();
if let Some(Ok(input)) = stdin().lock().lines().next() {
if input.to_lowercase() != "y" {
process::exit(0);
}
git_process(&["init"]);
}
}
let mut status = Status::new();
let mut branch_list = BranchList::new();
let mut git_output: Option<Output> = None;
crossterm::execute!(stdout(), terminal::EnterAlternateScreen)
.expect("failed to enter alternate screen");
terminal::enable_raw_mode().expect("failed to put terminal in raw mode");
print!("{}", cursor::Hide);
let mut state = State::Status;
let mut msg_buffer_height = 0;
loop {
let (term_width, term_height) =
terminal::size().expect("failed to query terminal dimensions");
match state {
State::Status | State::Commit => {
print!(
"{}{}{}{}",
cursor::MoveToRow(0),
terminal::Clear(ClearType::All),
status,
cursor::MoveToColumn(0)
);
}
State::Branch => {
print!(
"{}{}{}",
cursor::MoveToRow(0),
terminal::Clear(ClearType::All),
branch_list
);
let _ = stdout().flush();
}
}
// Display the available commit commands
if state == State::Commit {
print!(
"{}{:═^term_width$}{}{}{}",
cursor::MoveTo(0, term_height - 1 - COMMIT_CMDS.len() as u16),
"Commit Options",
SetForegroundColor(Color::Red),
COMMIT_CMDS
.into_iter()
.map(|(k, v)| format!(
"\n{} {}{}{}{} => {}",
cursor::MoveToColumn(0),
SetForegroundColor(Color::Green),
Attribute::Bold,
k,
Attribute::Reset,
v
),)
.collect::<String>(),
SetForegroundColor(Color::Reset),
term_width = term_width as usize,
);
let _ = stdout().flush();
}
if let Some(output) = git_output {
terminal::disable_raw_mode().unwrap();
match output.status.success() {
true => {
// NOTE: I am still unsure if we want to propagate stdout on success. I fear
// that it may clutter the UI and a successful change should be communicated
// through seeing the results in gex anyway.
let git_msg = std::str::from_utf8(&output.stdout)
.unwrap()
.trim()
.replace(
'+',
&format!(
"{}+{}",
SetForegroundColor(Color::DarkGreen),
SetForegroundColor(Color::Reset)
),
)
.replace(
'-',
&format!(
"{}-{}",
SetForegroundColor(Color::DarkRed),
SetForegroundColor(Color::Reset)
),
);
if !git_msg.is_empty() {
msg_buffer_height = git_msg.lines().count() + 1;
print!(
"{}{:─<term_width$}\n{}",
cursor::MoveTo(0, term_height.saturating_sub(msg_buffer_height as u16)),
"",
git_msg,
term_width = term_width as usize,
);
}
}
false => {
let git_msg = std::str::from_utf8(&output.stderr).unwrap().trim();
if !git_msg.is_empty() {
msg_buffer_height = git_msg.lines().count() + 1;
print!(
"{}{:─<term_width$}\n{}{}{}",
cursor::MoveTo(0, term_height.saturating_sub(msg_buffer_height as u16)),
"",
SetForegroundColor(Color::Red),
git_msg,
SetForegroundColor(Color::Reset),
term_width = term_width as usize,
);
}
}
}
terminal::enable_raw_mode().unwrap();
let _ = stdout().flush();
git_output = None;
} else {
msg_buffer_height = 0;
}
if let Event::Key(event) = event::read().unwrap() {
match state {
State::Status => match event.code {
KeyCode::Char('j') | KeyCode::Down => status.down(),
KeyCode::Char('k') | KeyCode::Up => status.up(),
KeyCode::Char('s') => status.stage(),
KeyCode::Char('S') => {
git_output = Some(git_process(&["add", "."]));
status.fetch();
}
KeyCode::Char('u') => status.unstage(),
KeyCode::Char('U') => {
git_output = Some(git_process(&["reset"]));
status.fetch();
}
KeyCode::Tab => status.expand(),
KeyCode::Char('c') => {
state = State::Commit;
}
KeyCode::Char('F') => {
git_output = Some(git_process(&["pull"]));
status.fetch();
}
KeyCode::Char('b') => {
branch_list.fetch();
state = State::Branch;
}
KeyCode::Char('r') => status.fetch(),
KeyCode::Char(':') => {
terminal::disable_raw_mode().expect("failed to disable raw mode");
// Clear the git output, if there is any. In future maybe organise the
// output / "terminal" as some kind of minibuffer so this is simpler.
for i in 0..=msg_buffer_height.min(term_height.into()) {
print!(
"{}{}",
cursor::MoveTo(0, term_height - i as u16),
terminal::Clear(ClearType::UntilNewLine)
);
}
print!(
"{}{}:git ",
cursor::MoveTo(0, term_height - 1),
cursor::Show
);
let _ = stdout().flush();
let input = stdin()
.lock()
.lines()
.next()
.expect("no stdin")
.expect("malformed stdin");
git_output =
Some(git_process(&input.split_whitespace().collect::<Vec<_>>()));
print!("{}", cursor::Hide);
terminal::enable_raw_mode().expect("failed to enable raw mode");
status.fetch();
}
KeyCode::Char('q') => {
terminal::disable_raw_mode().unwrap();
crossterm::execute!(
stdout(),
terminal::LeaveAlternateScreen,
cursor::Show,
cursor::MoveToColumn(0)
)
.expect("failed to leave alternate screen");
process::exit(0);
}
_ => {}
},
State::Commit => match event.code {
KeyCode::Char('c') => {
crossterm::execute!(stdout(), terminal::LeaveAlternateScreen)
.expect("failed to leave alternate screen");
git_output = Some(
Command::new("git")
.arg("commit")
.stdout(Stdio::inherit())
.stdin(Stdio::inherit())
.output()
.expect("failed to run `git commit`"),
);
status.fetch();
crossterm::execute!(stdout(), terminal::EnterAlternateScreen, cursor::Hide)
.expect("failed to enter alternate screen");
state = State::Status;
}
KeyCode::Char('e') => {
git_output = Some(
Command::new("git")
.args(["commit", "--amend", "--no-edit"])
.stdout(Stdio::inherit())
.stdin(Stdio::inherit())
.output()
.expect("failed to run `git commit`"),
);
status.fetch();
state = State::Status;
}
KeyCode::Char('a') => {
crossterm::execute!(stdout(), terminal::LeaveAlternateScreen)
.expect("failed to leave alternate screen");
git_output = Some(
Command::new("git")
.args(["commit", "--amend"])
.stdout(Stdio::inherit())
.stdin(Stdio::inherit())
.output()
.expect("failed to run `git commit`"),
);
status.fetch();
crossterm::execute!(stdout(), terminal::EnterAlternateScreen, cursor::Hide)
.expect("failed to enter alternate screen");
state = State::Status;
}
KeyCode::Esc => state = State::Status,
KeyCode::Char('q') => {
terminal::disable_raw_mode().unwrap();
crossterm::execute!(
stdout(),
terminal::LeaveAlternateScreen,
cursor::Show,
cursor::MoveToColumn(0)
)
.expect("failed to leave alternate screen");
process::exit(0);
}
_ => {}
},
State::Branch => match event.code {
KeyCode::Char('k') | KeyCode::Up => {
branch_list.cursor = branch_list.cursor.saturating_sub(1);
}
KeyCode::Char('j') | KeyCode::Down => {
branch_list.cursor += 1;
if branch_list.cursor >= branch_list.branches.len() {
branch_list.cursor = branch_list.branches.len() - 1;
}
}
KeyCode::Char(' ') | KeyCode::Enter => {
git_output = Some(branch_list.checkout());
status.fetch();
state = State::Status;
}
KeyCode::Char('b') => {
git_output = Some(BranchList::checkout_new());
status.fetch();
state = State::Status;
}
KeyCode::Esc => state = State::Status,
KeyCode::Char('q') => {
terminal::disable_raw_mode().unwrap();
crossterm::execute!(
stdout(),
terminal::LeaveAlternateScreen,
cursor::Show,
cursor::MoveToColumn(0)
)
.expect("failed to leave alternate screen");
process::exit(0);
}
_ => {}
},
};
}
}
}