[realpath] first implementation

Author: ianmclinden

README.md

@@ -146,6 +146,7 @@ Because it is a FAQ, the major differences between this project and uutils are:
  - [x] logger
  - [x] printf
  - [x] ps
+ - [x] realpath
  - [x] stty
  - [x] tabs
  - [x] test
@@ -213,7 +214,6 @@ Because it is a FAQ, the major differences between this project and uutils are:
  - [ ] newgrp
  - [ ] patch
  - [ ] pax
- - [ ] realpath
  - [ ] sed
  - [ ] sh
  - [ ] talk

misc/Cargo.toml

@@ -24,3 +24,6 @@ path = "./false.rs"
 name = "test"
 path = "./test.rs"
 
+[[bin]]
+name = "realpath"
+path = "./realpath.rs"

misc/realpath.rs

@@ -0,0 +1,36 @@
+//
+// Copyright (c) 2024 Ian McLinden
+//
+// 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
+//
+
+use gettextrs::{bind_textdomain_codeset, gettext, setlocale, textdomain, LocaleCategory};
+use plib::PROJECT_NAME;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut args: Vec<String> = std::env::args().skip(1).collect();
+
+    setlocale(LocaleCategory::LcAll, "");
+    textdomain(PROJECT_NAME)?;
+    bind_textdomain_codeset(PROJECT_NAME, "UTF-8")?;
+
+    if args.is_empty() {
+        args.push(String::from("."));
+    }
+
+    let mut exit_code = 0;
+    for path in args {
+        match std::fs::canonicalize(&path) {
+            Ok(p) => println!("{}", p.to_string_lossy()),
+            Err(e) => {
+                eprintln!("{path:?}: {}", gettext(e.to_string()));
+                exit_code |= 1;
+            }
+        }
+    }
+
+    std::process::exit(exit_code);
+}

misc/tests/misc-tests.rs

@@ -8,5 +8,6 @@
 //
 
 mod r#false;
+mod realpath;
 mod test;
 mod r#true;

misc/tests/realpath/mod.rs

@@ -0,0 +1,133 @@
+//
+// Copyright (c) 2024 Ian McLinden
+//
+// 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
+//
+
+use plib::{run_test, TestPlan};
+
+fn realpath_test(args: &[&str], output: &str, expected_code: i32) {
+    let str_args: Vec<String> = args.iter().map(|s| String::from(*s)).collect();
+
+    run_test(TestPlan {
+        cmd: String::from("realpath"),
+        args: str_args,
+        stdin_data: String::new(),
+        expected_out: output.to_string(),
+        expected_err: String::new(),
+        expected_exit_code: expected_code,
+    });
+}
+
+#[test]
+fn realpath_current_directory() {
+    let curr_dir = std::env::current_dir().unwrap();
+    let out_str = &format!("{}\n", curr_dir.to_str().unwrap());
+
+    realpath_test(&["."], out_str, 0);
+    realpath_test(&["./"], out_str, 0);
+    realpath_test(&["./."], out_str, 0);
+}
+
+#[test]
+fn realpath_parent_directory() {
+    let curr_dir = std::env::current_dir().unwrap();
+    let parent_dir = curr_dir.parent().unwrap();
+    let out_str = format!("{}\n", parent_dir.to_str().unwrap());
+
+    realpath_test(&[".."], &out_str, 0);
+    realpath_test(&["../"], &out_str, 0);
+    realpath_test(&["../."], &out_str, 0);
+    realpath_test(&["./.."], &out_str, 0);
+    realpath_test(&["./../"], &out_str, 0);
+    realpath_test(&["./../."], &out_str, 0);
+}
+
+#[test]
+fn realpath_endless_parent() {
+    realpath_test(
+        &["../../../../../../../../../../../../../../../../../../../.."],
+        "/\n",
+        0,
+    );
+    realpath_test(
+        &["../../../../../../../../../../../../../../../../../../../../"],
+        "/\n",
+        0,
+    );
+    realpath_test(
+        &["../../../../../../../../../../../../../../../../../../../../."],
+        "/\n",
+        0,
+    );
+    realpath_test(
+        &["./../../../../../../../../../../../../../../../../../../../.."],
+        "/\n",
+        0,
+    );
+    realpath_test(
+        &["./../../../../../../../../../../../../../../../../../../../../"],
+        "/\n",
+        0,
+    );
+    realpath_test(
+        &["./../../../../../../../../../../../../../../../../../../../../."],
+        "/\n",
+        0,
+    );
+}
+
+#[test]
+fn realpath_relative_directory() {
+    let curr_dir = std::env::current_dir().unwrap();
+    let curr_dir_name = curr_dir.file_name().unwrap();
+    let out_str = &format!("{}\n", curr_dir.to_str().unwrap());
+
+    let in_str = &format!("../{}", curr_dir_name.to_str().unwrap());
+    realpath_test(&[in_str], out_str, 0);
+
+    let in_str = &format!("./../{}", curr_dir_name.to_str().unwrap());
+    realpath_test(&[in_str], out_str, 0);
+
+    let in_str = &format!(
+        "{}/../{}",
+        curr_dir.to_str().unwrap(),
+        curr_dir_name.to_str().unwrap()
+    );
+    realpath_test(&[in_str], out_str, 0);
+}
+
+#[test]
+fn realpath_multiple_args() {
+    let curr_dir = std::env::current_dir().unwrap();
+    let parent_dir = curr_dir.parent().unwrap();
+    let out_str = &format!(
+        "{}\n{}\n/\n",
+        curr_dir.to_str().unwrap(),
+        parent_dir.to_str().unwrap()
+    );
+    realpath_test(&[".", "..", "/"], out_str, 0);
+}
+
+#[test]
+fn realpath_no_args() {
+    let curr_dir = std::env::current_dir().unwrap();
+    let out_str = format!("{}\n", curr_dir.to_str().unwrap());
+
+    realpath_test(&[], &out_str, 0);
+}
+
+#[test]
+fn realpath_empty_path() {
+    run_test(TestPlan {
+        cmd: String::from("realpath"),
+        args: vec![String::new()],
+        stdin_data: String::new(),
+        expected_out: String::new(),
+        expected_err: String::from("\"\": No such file or directory (os error 2)\n"),
+        expected_exit_code: 1,
+    });
+}