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use std::fmt;
use std::fs::read;
use std::process::exit;
use console::{style, Style};
use similar::{ChangeTag, TextDiff};
struct Line(Option<usize>);
impl fmt::Display for Line {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self.0 {
None => write!(f, " "),
Some(idx) => write!(f, "{:<4}", idx + 1),
}
}
}
fn main() {
let args: Vec<_> = std::env::args_os().collect();
if args.len() != 3 {
eprintln!("usage: terminal-inline [old] [new]");
exit(1);
}
let old = read(&args[1]).unwrap();
let new = read(&args[2]).unwrap();
let diff = TextDiff::from_lines(&old, &new);
for (idx, group) in diff.grouped_ops(3).iter().enumerate() {
if idx > 0 {
println!("{:-^1$}", "-", 80);
}
for op in group {
for change in diff.iter_inline_changes(op) {
let (sign, s) = match change.tag() {
ChangeTag::Delete => ("-", Style::new().red()),
ChangeTag::Insert => ("+", Style::new().green()),
ChangeTag::Equal => (" ", Style::new().dim()),
};
print!(
"{}{} |{}",
style(Line(change.old_index())).dim(),
style(Line(change.new_index())).dim(),
s.apply_to(sign).bold(),
);
for (emphasized, value) in change.iter_strings_lossy() {
if emphasized {
print!("{}", s.apply_to(value).underlined().on_black());
} else {
print!("{}", s.apply_to(value));
}
}
if change.missing_newline() {
println!();
}
}
}
}
}
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