change/uutils ~ allow (almost) any name for the multi-binary container

- final multi-binary will now function correctly with any binary/executable name
- multi-binary container acts as the specified util IF EITHER ...
  1. the binary/executable name exactly matches the name of an applet/util
  2. the binary/exectuable name matches <PREFIX><UTIL_NAME> pattern
     * where the PREFIX is any string ending in a non-alphanumeric character

Cargo.toml

@@ -214,7 +214,9 @@ feat_os_windows_legacy = [
 [workspace]
 
 [dependencies]
-uucore   = "0.0.2"
+lazy_static = { version="1.3" }
+uucore = { version="0.0.2" }
+# * uutils
 arch     = { optional=true, path="src/uu/arch" }
 base32   = { optional=true, path="src/uu/base32" }
 base64   = { optional=true, path="src/uu/base64" }
@@ -315,7 +317,6 @@ _backtrace = { version=">= 0.3.3, <= 0.3.30", package="backtrace" }
 
 [dev-dependencies]
 filetime = "0.2"
-lazy_static = "1.3"
 libc = "0.2"
 rand = "0.6"
 regex = "1.0"

src/bin/uutils.rs

@@ -1,5 +1,3 @@
-#![crate_name = "uutils"]
-
 /*
  * This file is part of the uutils coreutils package.
  *
@@ -9,27 +7,37 @@
  * file that was distributed with this source code.
  */
 
+// spell-checker:ignore (acronyms/names) Gehring
+// spell-checker:ignore (rustlang) clippy concat rustlang
+// spell-checker:ignore (uutils) coreutils uucore uumain uutils sigpipe
+// spell-checker:ignore (shell) busybox
+
 include!(concat!(env!("OUT_DIR"), "/uutils_crates.rs"));
 
-use std::collections::hash_map::HashMap;
-use std::io::Write;
-use std::path::Path;
-
+extern crate lazy_static;
 extern crate uucore;
 
-static NAME: &str = "uutils";
+use lazy_static::lazy_static;
+use std::collections::hash_map::HashMap;
+use std::io::Write;
+
 static VERSION: &str = env!("CARGO_PKG_VERSION");
 
+lazy_static! {
+    static ref BINARY_PATH: std::path::PathBuf = std::env::current_exe().unwrap();
+    static ref NAME: &'static str = &*BINARY_PATH.file_stem().unwrap().to_str().unwrap();
+}
+
 include!(concat!(env!("OUT_DIR"), "/uutils_map.rs"));
 
-fn usage(cmap: &UtilityMap) {
-    println!("{} {}", NAME, VERSION);
+fn usage(utils: &UtilityMap) {
+    println!("{} {}", *NAME, VERSION);
     println!();
     println!("Usage:");
-    println!("  {} [util [arguments...]]\n", NAME);
+    println!("  {} [util [arguments...]]\n", *NAME);
     println!("Currently defined functions:");
     #[allow(clippy::map_clone)]
-    let mut utils: Vec<&str> = cmap.keys().map(|&s| s).collect();
+    let mut utils: Vec<&str> = utils.keys().map(|&s| s).collect();
     utils.sort();
     for util in utils {
         println!("\t{}", util);
@@ -39,44 +47,36 @@ fn usage(cmap: &UtilityMap) {
 fn main() {
     uucore::panic::install_sigpipe_hook();
 
-    let umap = util_map();
+    let utils = util_map();
     let mut args: Vec<String> = uucore::args().collect();
 
-    // try binary name as util name.
-    let args0 = args[0].clone();
-    let binary = Path::new(&args0[..]);
+    let binary = &BINARY_PATH;
     let binary_as_util = binary.file_stem().unwrap().to_str().unwrap();
 
-    if let Some(&uumain) = umap.get(binary_as_util) {
+    // binary name equals util name?
+    if let Some(&uumain) = utils.get(binary_as_util) {
         std::process::exit(uumain(args));
     }
 
-    if binary_as_util.ends_with("uutils")
-        || binary_as_util.starts_with("uutils")
-        || binary_as_util.ends_with("busybox")
-        || binary_as_util.starts_with("busybox")
-    {
-        args.remove(0);
+    // binary name equals prefixed util name?
+    // * prefix/stem may be any string ending in a non-alphanumeric character
+    if let Some(util) = utils.keys().find(|util| {
+        binary_as_util.ends_with(*util)
+            && !(&binary_as_util[..binary_as_util.len() - (*util).len()])
+                .ends_with(char::is_alphanumeric)
+    }) {
+        // prefixed util => replace 0th (aka, executable name) argument
+        args[0] = (*util).to_owned();
     } else {
-        let mut found = false;
-        for util in umap.keys() {
-            if binary_as_util.ends_with(util) {
-                args[0] = (*util).to_owned();
-                found = true;
-                break;
-            }
-        }
-        if !found {
-            println!("{}: applet not found", binary_as_util);
-            std::process::exit(1);
-        }
+        // unmatched binary name => regard as multi-binary container and advance argument list
+        args.remove(0);
     }
 
-    // try first arg as util name.
+    // 0th argument equals util name?
     if !args.is_empty() {
         let util = &args[0][..];
 
-        match umap.get(util) {
+        match utils.get(util) {
             Some(&uumain) => {
                 std::process::exit(uumain(args.clone()));
             }
@@ -85,7 +85,7 @@ fn main() {
                     // see if they want help on a specific util
                     if args.len() >= 2 {
                         let util = &args[1][..];
-                        match umap.get(util) {
+                        match utils.get(util) {
                             Some(&uumain) => {
                                 let code = uumain(vec![util.to_owned(), "--help".to_owned()]);
                                 std::io::stdout().flush().expect("could not flush stdout");
@@ -97,7 +97,7 @@ fn main() {
                             }
                         }
                     }
-                    usage(&umap);
+                    usage(&utils);
                     std::process::exit(0);
                 } else {
                     println!("{}: applet not found", util);
@@ -107,7 +107,7 @@ fn main() {
         }
     } else {
         // no arguments provided
-        usage(&umap);
+        usage(&utils);
         std::process::exit(0);
     }
 }