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use chrono::{DateTime, FixedOffset};
use lazy_static::lazy_static;
use regex::Regex;
use crate::color;
use crate::config;
use crate::delta::{self, State, StateMachine};
use crate::format;
use crate::paint::BgShouldFill;
use crate::style::Style;
impl<'a> StateMachine<'a> {
/// If this is a line of git blame output then render it accordingly. If
/// this is the first blame line, then set the syntax-highlighter language
/// according to delta.default-language.
pub fn handle_blame_line(&mut self) -> std::io::Result<bool> {
let mut handled_line = false;
self.painter.emit()?;
if matches!(self.state, State::Unknown | State::Blame(_)) {
if let Some(blame) =
parse_git_blame_line(&self.line, &self.config.blame_timestamp_format)
{
// Determine color for this line
let color = if let Some(color) = self.blame_commit_colors.get(blame.commit) {
color
} else {
let n_commits = self.blame_commit_colors.len();
let n_colors = self.config.blame_palette.len();
let new_color = &self.config.blame_palette[(n_commits + 1) % n_colors];
self.blame_commit_colors
.insert(blame.commit.to_owned(), new_color.to_owned());
new_color
};
let mut style = Style::from_colors(None, color::parse_color(color, true));
style.is_syntax_highlighted = true;
// Construct commit metadata, paint, and emit
let format_data = format::parse_line_number_format(
&self.config.blame_format,
&*BLAME_PLACEHOLDER_REGEX,
);
write!(
self.painter.writer,
"{}",
style.paint(format_blame_metadata(&format_data, &blame, self.config))
)?;
// Emit syntax-highlighted code
if matches!(self.state, State::Unknown) {
if let Some(lang) = self.config.default_language.as_ref() {
self.painter.set_syntax(Some(lang));
self.painter.set_highlighter();
}
self.state = State::Blame(blame.commit.to_owned());
}
self.painter.syntax_highlight_and_paint_line(
blame.code,
style,
self.state.clone(),
BgShouldFill::default(),
);
handled_line = true
}
}
Ok(handled_line)
}
}
#[derive(Debug)]
pub struct BlameLine<'a> {
pub commit: &'a str,
pub author: &'a str,
pub time: DateTime<FixedOffset>,
pub line_number: usize,
pub code: &'a str,
}
// E.g.
//ea82f2d0 (Dan Davison 2021-08-22 18:20:19 -0700 120) let mut handled_line = self.handle_commit_meta_header_line()?
lazy_static! {
static ref BLAME_LINE_REGEX: Regex = Regex::new(
r"(?x)
^
(
[0-9a-f]{8} # commit hash
)
[\ ]
\( # open (
(
[^\ ].*[^\ ] # author name
)
[\ ]+
( # timestamp
[0-9]{4}-[0-9]{2}-[0-9]{2}\ [0-9]{2}:[0-9]{2}:[0-9]{2}\ [-+][0-9]{4}
)
[\ ]+
(
[0-9]+ # line number
)
\) # close )
(
.* # code, with leading space
)
$
"
)
.unwrap();
}
pub fn parse_git_blame_line<'a>(line: &'a str, timestamp_format: &str) -> Option<BlameLine<'a>> {
if let Some(caps) = BLAME_LINE_REGEX.captures(line) {
let commit = caps.get(1).unwrap().as_str();
let author = caps.get(2).unwrap().as_str();
let timestamp = caps.get(3).unwrap().as_str();
if let Ok(time) = DateTime::parse_from_str(timestamp, timestamp_format) {
let line_number_str = caps.get(4).unwrap().as_str();
if let Ok(line_number) = line_number_str.parse::<usize>() {
let code = caps.get(5).unwrap().as_str();
Some(BlameLine {
commit,
author,
time,
line_number,
code,
})
} else {
None
}
} else {
None
}
} else {
None
}
}
lazy_static! {
pub static ref BLAME_PLACEHOLDER_REGEX: Regex =
format::make_placeholder_regex(&["timestamp", "author", "commit"]);
}
pub fn format_blame_metadata(
format_data: &[format::FormatStringPlaceholderData],
blame: &BlameLine,
config: &config::Config,
) -> String {
let mut s = String::new();
let mut suffix = "";
for placeholder in format_data {
s.push_str(placeholder.prefix);
let alignment_spec = placeholder.alignment_spec.unwrap_or("<");
let width = placeholder.width.unwrap_or(15);
let pad = |s| format::pad(s, width, alignment_spec);
match placeholder.placeholder {
Some("timestamp") => s.push_str(&pad(
&chrono_humanize::HumanTime::from(blame.time).to_string()
)),
Some("author") => s.push_str(&pad(blame.author)),
Some("commit") => s.push_str(&pad(&delta::format_raw_line(blame.commit, config))),
None => {}
Some(_) => unreachable!(),
}
suffix = placeholder.suffix;
}
s.push_str(suffix);
s
}
#[test]
fn test_blame_line_regex() {
for line in &[
"ea82f2d0 (Dan Davison 2021-08-22 18:20:19 -0700 120) let mut handled_line = self.handle_commit_meta_header_line()?",
"b2257cfa (Dan Davison 2020-07-18 15:34:43 -0400 1) use std::borrow::Cow;"
] {
let caps = BLAME_LINE_REGEX.captures(line);
assert!(caps.is_some());
assert!(parse_git_blame_line(line, "%Y-%m-%d %H:%M:%S %z").is_some());
}
}
|
