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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Copied from https://github.com/9ary/gitprompt-rs/blob/master/src/main.rs
// Couldn't use without forking and I'm lazy.
use std::error::Error;
use std::fmt::Write as _;
use std::path::Path;
use std::process;
use crate::fm_error::{FmError, FmResult};
struct GitStatus {
branch: Option<String>,
ahead: i64,
behind: i64,
staged: i64,
modified: i64,
deleted: i64,
unmerged: i64,
untracked: i64,
}
fn parse_porcelain2(data: String) -> Option<GitStatus> {
let mut status = GitStatus {
branch: None,
ahead: 0,
behind: 0,
staged: 0,
modified: 0,
deleted: 0,
unmerged: 0,
untracked: 0,
};
// Simple parser for the porcelain v2 format
for entry in data.split('\0') {
let mut entry = entry.split(' ');
match entry.next() {
// Header lines
Some("#") => match entry.next()? {
"branch.head" => {
let head = entry.next()?;
if head != "(detached)" {
status.branch = Some(String::from(head));
}
}
"branch.ab" => {
let a = entry.next()?;
let b = entry.next()?;
status.ahead = a.parse::<i64>().ok()?.abs();
status.behind = b.parse::<i64>().ok()?.abs();
}
_ => {}
},
// File entries
Some("1") | Some("2") => {
let mut xy = entry.next()?.chars();
let x = xy.next()?;
let y = xy.next()?;
if x != '.' {
status.staged += 1;
}
match y {
'M' => status.modified += 1,
'D' => status.deleted += 1,
_ => {}
}
}
Some("u") => status.unmerged += 1,
Some("?") => status.untracked += 1,
_ => {}
}
}
Some(status)
}
/// Returns a string representation of the git status of this path.
/// Will return an empty string if we're not in a git repository.
pub fn git(path: &Path) -> Result<String, Box<dyn Error>> {
if std::env::set_current_dir(path).is_err() {
// The path may not exist. It should never happen.
return Ok("".to_owned());
}
let output = process::Command::new("git")
.args([
"status",
"--porcelain=v2",
"-z",
"--branch",
"--untracked-files=all",
])
.stdin(process::Stdio::null())
.stderr(process::Stdio::null())
.output()?;
if !output.status.success() {
// We're most likely not in a Git repo
return Ok("".to_owned());
}
let status = String::from_utf8(output.stdout)
.ok()
.ok_or("Invalid UTF-8 while decoding Git output")?;
let status = parse_porcelain2(status).ok_or("Error while parsing Git output")?;
let mut git_string = String::new();
git_string.push('(');
if let Some(branch) = status.branch {
git_string.push_str(&branch);
} else {
// Detached head
git_string.push_str(":HEAD");
}
// Divergence with remote branch
if status.ahead != 0 {
write!(git_string, "↑{}", status.ahead)?;
}
if status.behind != 0 {
write!(git_string, "↓{}", status.ahead)?;
}
if status.untracked + status.modified + status.deleted + status.unmerged + status.staged > 0 {
git_string.push('|');
}
if status.untracked != 0 {
write!(git_string, "+{}", status.untracked)?;
}
if status.modified != 0 {
write!(git_string, "~{}", status.modified)?;
}
if status.deleted != 0 {
write!(git_string, "-{}", status.deleted)?;
}
if status.unmerged != 0 {
write!(git_string, "x{}", status.unmerged)?;
}
if status.staged != 0 {
write!(git_string, "•{}", status.staged)?;
}
git_string.push(')');
Ok(git_string)
}
/// Returns the git root.
/// Returns an error outside of a git repository.
pub fn git_root() -> FmResult<String> {
let output = process::Command::new("git")
.args(["rev-parse", "--show-toplevel"])
.stdin(process::Stdio::null())
.stderr(process::Stdio::null())
.output()?;
if !output.status.success() {
// We're most likely not in a Git repo
return Err(FmError::custom("git root", "git command returned an error"));
}
Ok(String::from_utf8(output.stdout)?.trim().to_owned())
}
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