feat(args): add --workdir argument

git-cliff/src/args.rs

@@ -28,7 +28,10 @@ pub struct Opt {
 		value_name = "PATH",
 		default_value = "cliff.toml"
 	)]
-	pub config:     String,
+	pub config:     PathBuf,
+	/// Sets the working directory.
+	#[structopt(short, long, env, value_name = "PATH")]
+	pub workdir:    Option<PathBuf>,
 	/// Sets the repository to parse commits from.
 	#[structopt(short, long, env, value_name = "PATH")]
 	pub repository: Option<PathBuf>,

git-cliff/src/lib.rs

@@ -24,9 +24,27 @@ use std::fs::{
 use std::io;
 
 /// Runs `git-cliff`.
-pub fn run(args: Opt) -> Result<()> {
+pub fn run(mut args: Opt) -> Result<()> {
+	// Set the working directory.
+	if let Some(workdir) = args.workdir {
+		args.config = workdir.join(args.config);
+		args.repository = match args.repository {
+			Some(repository) => Some(workdir.join(repository)),
+			None => Some(workdir.clone()),
+		};
+		if let Some(changelog) = args.changelog {
+			args.changelog = Some(workdir.join(changelog));
+		}
+	}
+
 	// Parse configuration file.
-	let mut config = Config::parse(args.config)?;
+	let mut config = Config::parse(match args.config.to_str() {
+		Some(v) => Ok(v.to_string()),
+		None => Err(Error::IoError(io::Error::new(
+			io::ErrorKind::Other,
+			"path contains invalid characters",
+		))),
+	}?)?;
 
 	// Update the configuration based on command line arguments.
 	match args.strip.as_deref() {