feat(cli): Add colors to CLI help outputs

Author: alerque

Cargo.toml

@@ -38,7 +38,7 @@ snafu = "0.8"
 [dependencies.clap]
 version = "4.5"
 optional = true
-features = ["derive", "wrap_help"]
+features = ["derive", "color", "wrap_help"]
 
 [dependencies.git2]
 version = "0.20"

src/bin/git-warp-time.rs

@@ -3,7 +3,7 @@
 
 use clap::CommandFactory;
 
-use git_warp_time::cli::Cli;
+use git_warp_time::cli::{Cli, STYLES};
 use git_warp_time::FileSet;
 use git_warp_time::{get_repo, reset_mtimes, resolve_repo_path};
 
@@ -40,7 +40,7 @@ type Result<T, E = Error> = std::result::Result<T, E>;
 
 fn main() -> Result<()> {
     let version = option_env!("VERGEN_GIT_DESCRIBE").unwrap_or_else(|| env!("CARGO_PKG_VERSION"));
-    let app = Cli::command().version(version);
+    let app = Cli::command().version(version).styles(STYLES);
     let matches = app.get_matches();
     let positionals = matches.get_many::<String>("paths");
     let repo = get_repo().context(NoRepositorySnafu)?;

src/cli.rs

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: © 2021 Caleb Maclennan <caleb@alerque.com>
 // SPDX-License-Identifier: GPL-3.0-only
 
+use clap::builder::styling::{AnsiColor, Styles};
 use clap::Parser;
 
 /// CLI utility that resets the timestamps of files in a Git repository working directory
@@ -28,3 +29,12 @@ pub struct Cli {
     #[arg(value_hint = clap::ValueHint::FilePath)]
     pub paths: Option<Vec<String>>,
 }
+
+pub const STYLES: Styles = Styles::styled()
+    .header(AnsiColor::Magenta.on_default().bold())
+    .usage(AnsiColor::Yellow.on_default().bold())
+    .literal(AnsiColor::BrightCyan.on_default().bold())
+    .placeholder(AnsiColor::Cyan.on_default())
+    .error(AnsiColor::BrightRed.on_default().bold())
+    .valid(AnsiColor::BrightGreen.on_default().bold())
+    .invalid(AnsiColor::BrightYellow.on_default().bold());