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Cargo.toml

···
+[package]
+name = "diffwatch"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow = "1.0.100"
+clap = { version = "4.5.49", features = ["derive"] }
+diff = "0.1.13"
+notify = "8.2.0"
+termcolor = "1.4.1"

README.md

···
+# `diffwatch`
+
+Watches a file and prints human-readable, coloured diffs.

src/main.rs

···
+use std::{fs::read_to_string, io::Write as _, path::PathBuf, sync::mpsc};
+
+use clap::{Parser, ValueEnum};
+use notify::{RecursiveMode, Watcher};
+use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
+
+/// Watch a file and print diffs of changes.
+#[derive(Debug, Parser)]
+#[command(version, about, long_about = None)]
+pub struct Args {
+    /// Path to the file to watch.
+    file: PathBuf,
+
+    /// Whether to enable color output.
+    #[arg(long, value_enum, default_value_t = ColorMode::Auto)]
+    color: ColorMode,
+
+    /// Show unchanged lines.
+    #[arg(long, default_value_t = false)]
+    show_unchanged: bool,
+}
+
+#[derive(Debug, Copy, Clone, PartialEq, Eq, ValueEnum)]
+enum ColorMode {
+    Auto,
+    Always,
+    Never,
+}
+
+impl From<ColorMode> for ColorChoice {
+    fn from(value: ColorMode) -> Self {
+        match value {
+            ColorMode::Auto => Self::Auto,
+            ColorMode::Always => Self::Always,
+            ColorMode::Never => Self::Never,
+        }
+    }
+}
+
+fn main() -> anyhow::Result<()> {
+    let args = Args::parse();
+    let (tx, rx) = mpsc::channel();
+    let mut stdout = StandardStream::stdout(args.color.into());
+
+    let mut watcher = notify::recommended_watcher(tx)?;
+    watcher.watch(&args.file, RecursiveMode::NonRecursive)?;
+
+    let mut old_content = read_to_string(&args.file)?;
+
+    for evt in rx {
+        let evt = evt?;
+
+        match evt.kind {
+            notify::EventKind::Create(_) | notify::EventKind::Modify(_) => {
+                let new_content = read_to_string(&args.file)?;
+
+                if old_content == new_content {
+                    // ignore
+                    continue;
+                }
+
+                on_update(&mut stdout, &old_content, &new_content, args.show_unchanged)?;
+                old_content = new_content;
+            }
+            notify::EventKind::Remove(_) => {
+                stdout.reset()?;
+                writeln!(&mut stdout, "................ file deleted!")?;
+                break;
+            }
+            _ => {}
+        }
+    }
+
+    stdout.reset()?;
+
+    Ok(())
+}
+
+fn on_update(
+    out: &mut impl WriteColor,
+    old_content: &str,
+    new_content: &str,
+    show_unchanged: bool,
+) -> std::io::Result<()> {
+    let color_deleted = {
+        let mut color = ColorSpec::new();
+        color.set_fg(Some(Color::Red));
+        color
+    };
+    let color_unchanged = ColorSpec::new();
+    let color_added = {
+        let mut color = ColorSpec::new();
+        color.set_fg(Some(Color::Green));
+        color
+    };
+    let (mut left_line, mut right_line) = (0, 0);
+
+    out.reset()?;
+    writeln!(out, "................ file modified!")?;
+    for line in diff::lines(old_content, new_content) {
+        match line {
+            diff::Result::Left(l) => {
+                left_line += 1;
+
+                out.set_color(&color_deleted)?;
+                writeln!(out, "{left_line:>5}       - {l}")?;
+            }
+            diff::Result::Both(l, _) => {
+                left_line += 1;
+                right_line += 1;
+                if show_unchanged {
+                    out.set_color(&color_unchanged)?;
+                    writeln!(out, "{left_line:>5} {right_line:>5} | {l}")?;
+                }
+            }
+            diff::Result::Right(l) => {
+                right_line += 1;
+                out.set_color(&color_added)?;
+                writeln!(out, "      {right_line:>5} + {l}")?;
+            }
+        }
+    }
+    out.reset()?;
+
+    Ok(())
+}