add util: dirname

pathnames/Cargo.toml

@@ -12,3 +12,7 @@ gettext-rs = { version = "0.7", features = ["gettext-system"] }
 name = "basename"
 path = "src/basename.rs"
 
+[[bin]]
+name = "dirname"
+path = "src/dirname.rs"
+

pathnames/src/dirname.rs

@@ -0,0 +1,41 @@
+//
+// Copyright (c) 2024 Jeff Garzik
+//
+// This file is part of the posixutils-rs project covered under
+// the MIT License.  For the full license text, please see the LICENSE
+// file in the root directory of this project.
+// SPDX-License-Identifier: MIT
+//
+
+extern crate clap;
+extern crate plib;
+
+use clap::Parser;
+use gettextrs::{bind_textdomain_codeset, textdomain};
+use plib::PROJECT_NAME;
+use std::path::PathBuf;
+
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about)]
+struct Args {
+    pathname: String,
+}
+
+fn show_dirname(args: &Args) {
+    let mut pb = PathBuf::from(&args.pathname);
+    pb.pop();
+
+    println!("{}", pb.to_string_lossy());
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // parse command line arguments
+    let args = Args::parse();
+
+    textdomain(PROJECT_NAME)?;
+    bind_textdomain_codeset(PROJECT_NAME, "UTF-8")?;
+
+    show_dirname(&args);
+
+    Ok(())
+}