Merge pull request #12 from rustcoreutils/pwd

add util: pwd

README.md

@@ -125,7 +125,7 @@ https://github.com/jgarzik/posixutils
  - [ ] printf
  - [ ] prs (SCCS)
  - [ ] ps
- - [ ] pwd
+ - [x] pwd
  - [ ] qalter (Batch cat.)
  - [ ] qdel (Batch cat.)
  - [ ] qhold (Batch cat.)

users/Cargo.toml

@@ -25,6 +25,10 @@ path = "src/logger.rs"
 name = "mesg"
 path = "src/mesg.rs"
 
+[[bin]]
+name = "pwd"
+path = "src/pwd.rs"
+
 [[bin]]
 name = "tty"
 path = "src/tty.rs"

users/src/pwd.rs

@@ -0,0 +1,77 @@
+//
+// 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
+//
+// TODO:
+// - compliance:  for -L mode, Rust performs unwanted normalization for "."
+//
+
+extern crate clap;
+extern crate plib;
+
+use clap::Parser;
+use gettextrs::{bind_textdomain_codeset, textdomain};
+use plib::PROJECT_NAME;
+use std::ffi::OsStr;
+use std::path::{Component, Path};
+
+const PWD_ENV: &'static str = "PWD";
+
+/// pwd - return working directory name
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about)]
+struct Args {
+    /// Count number of bytes in each file
+    #[arg(short = 'L', long)]
+    env: bool,
+
+    /// Count number of bytes in each file
+    #[arg(short = 'P', long)]
+    process: bool,
+}
+
+fn dirname_valid(name: &OsStr) -> bool {
+    let path = Path::new(name);
+
+    let mut first = true;
+    for component in path.components() {
+        if first {
+            first = false;
+
+            if component != Component::RootDir {
+                return false;
+            }
+        } else {
+            if component == Component::CurDir || component == Component::ParentDir {
+                return false;
+            }
+        }
+    }
+
+    true
+}
+
+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")?;
+
+    let mut cwd = std::env::current_dir()?.into_os_string();
+    if args.env {
+        if let Some(dir) = std::env::var_os(PWD_ENV) {
+            if dirname_valid(&dir) {
+                cwd = dir.clone();
+            }
+        }
+    }
+
+    println!("{}", cwd.to_string_lossy());
+
+    Ok(())
+}