base32: move from getopts to clap

Note, I needed to change the error messages in one of the tests because
getopt and clap have different error messages when not providing a
default value

Cargo.lock

@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "advapi32-sys"
 version = "0.2.0"
@@ -1653,6 +1655,7 @@ dependencies = [
 name = "uu_base32"
 version = "0.0.6"
 dependencies = [
+ "clap",
  "uucore",
  "uucore_procs",
 ]

src/uu/base32/Cargo.toml

@@ -15,6 +15,7 @@ edition = "2018"
 path = "src/base32.rs"
 
 [dependencies]
+clap = "2.33"
 uucore = { version=">=0.0.8", package="uucore", path="../../uucore", features = ["encoding"] }
 uucore_procs = { version=">=0.0.5", package="uucore_procs", path="../../uucore_procs" }
 

src/uu/base32/src/base32.rs

@@ -11,7 +11,6 @@ use uucore::encoding::Format;
 
 mod base_common;
 
-static SYNTAX: &str = "[OPTION]... [FILE]";
 static SUMMARY: &str = "Base32 encode or decode FILE, or standard input, to standard output.";
 static LONG_HELP: &str = "
  With no FILE, or when FILE is -, read standard input.
@@ -24,11 +23,5 @@ static LONG_HELP: &str = "
 ";
 
 pub fn uumain(args: impl uucore::Args) -> i32 {
-    base_common::execute(
-        args.collect_str(),
-        SYNTAX,
-        SUMMARY,
-        LONG_HELP,
-        Format::Base32,
-    )
+    base_common::execute(args.collect_str(), SUMMARY, LONG_HELP, Format::Base32)
 }

src/uu/base32/src/base_common.rs

@@ -11,60 +11,172 @@ use std::fs::File;
 use std::io::{stdin, stdout, BufReader, Read, Write};
 use std::path::Path;
 
+use clap::{App, Arg};
 use uucore::encoding::{wrap_print, Data, Format};
 
-pub fn execute(
-    args: Vec<String>,
-    syntax: &str,
-    summary: &str,
-    long_help: &str,
-    format: Format,
-) -> i32 {
-    let matches = app!(syntax, summary, long_help)
-        .optflag("d", "decode", "decode data")
-        .optflag(
-            "i",
-            "ignore-garbage",
-            "when decoding, ignore non-alphabetic characters",
-        )
-        .optopt(
-            "w",
-            "wrap",
-            "wrap encoded lines after COLS character (default 76, 0 to disable wrapping)",
-            "COLS",
-        )
-        .parse(args);
+static VERSION: &str = env!("CARGO_PKG_VERSION");
 
-    let line_wrap = matches.opt_str("wrap").map(|s| match s.parse() {
-        Ok(n) => n,
-        Err(e) => {
-            crash!(1, "invalid wrap size: ‘{}’: {}", s, e);
+pub mod options {
+    pub static DECODE: &str = "decode";
+    pub static WRAP: &str = "wrap";
+    pub static IGNORE_GARBAGE: &str = "ignore-garbage";
+    pub static FILE: &str = "file";
+}
+
+struct Config {
+    decode: bool,
+    ignore_garbage: bool,
+    wrap_cols: Option<usize>,
+    to_read: Option<String>,
+}
+
+impl Config {
+    fn from(options: clap::ArgMatches) -> Config {
+        let file: Option<String> = match options.values_of(options::FILE) {
+            Some(mut values) => {
+                if values.len() != 1 {
+                    crash!(3, "extra operand ‘{}’", values.nth(0).unwrap())
+                }
+                let name = values.nth(0).unwrap();
+                if !Path::exists(Path::new(name)) {
+                    crash!(2, "{}: No such file or directory", name);
+                }
+
+                if name == "-" {
+                    None // stdin
+                } else {
+                    Some(name.to_owned())
+                }
+            }
+            None => None,
+        };
+
+        let cols = match options.value_of(options::WRAP) {
+            Some(num) => match num.parse::<usize>() {
+                Ok(n) => Some(n),
+                Err(e) => {
+                    crash!(1, "invalid wrap size: ‘{}’: {}", num, e);
+                }
+            },
+            None => None,
+        };
+
+        Config {
+            decode: options.is_present(options::DECODE),
+            ignore_garbage: options.is_present(options::IGNORE_GARBAGE),
+            wrap_cols: cols,
+            to_read: file,
         }
-    });
-    let ignore_garbage = matches.opt_present("ignore-garbage");
-    let decode = matches.opt_present("decode");
-
-    if matches.free.len() > 1 {
-        show_usage_error!("extra operand ‘{}’", matches.free[0]);
-        return 1;
     }
+}
 
-    if matches.free.is_empty() || &matches.free[0][..] == "-" {
-        let stdin_raw = stdin();
-        handle_input(
-            &mut stdin_raw.lock(),
-            format,
-            line_wrap,
-            ignore_garbage,
-            decode,
-        );
-    } else {
-        let path = Path::new(matches.free[0].as_str());
-        let file_buf = safe_unwrap!(File::open(&path));
-        let mut input = BufReader::new(file_buf);
-        handle_input(&mut input, format, line_wrap, ignore_garbage, decode);
+fn get_usage() -> String {
+    format!("{0} [OPTION]... [FILE]", executable!())
+}
+
+pub fn execute(args: Vec<String>, _summary: &str, long_help: &str, format: Format) -> i32 {
+    let usage = get_usage();
+    let app = App::new(executable!())
+        .version(VERSION)
+        .usage(&usage[..])
+        .about(long_help)
+        // Format arguments.
+        .arg(
+            Arg::with_name(options::DECODE)
+                .short("d")
+                .long(options::DECODE)
+                .help("decode data"),
+        )
+        .arg(
+            Arg::with_name(options::IGNORE_GARBAGE)
+                .short("i")
+                .long(options::IGNORE_GARBAGE)
+                .help("when decoding, ignore non-alphabetic characters"),
+        )
+        .arg(
+            Arg::with_name(options::WRAP)
+                .short("w")
+                .long(options::WRAP)
+                .takes_value(true)
+                .help(
+                    "wrap encoded lines after COLS character (default 76, 0 to disable wrapping)",
+                ),
+        )
+        // "multiple" arguments are used to check whether there is more than one
+        // file passed in.
+        .arg(Arg::with_name(options::FILE).index(1).multiple(true));
+
+    let config: Config = Config::from(app.get_matches_from(args));
+    match config.to_read {
+        // Read from file.
+        Some(name) => {
+            let file_buf = safe_unwrap!(File::open(Path::new(&name)));
+            let mut input = BufReader::new(file_buf);
+            handle_input(
+                &mut input,
+                format,
+                config.wrap_cols,
+                config.ignore_garbage,
+                config.decode,
+            );
+        }
+        // stdin
+        None => {
+            handle_input(
+                &mut stdin().lock(),
+                format,
+                config.wrap_cols,
+                config.ignore_garbage,
+                config.decode,
+            );
+        }
     };
 
+    // let matches = app!(syntax, summary, long_help)
+    //     .optflag("d", "decode", "decode data")
+    //     .optflag(
+    //         "i",
+    //         "ignore-garbage",
+    //         "when decoding, ignore non-alphabetic characters",
+    //     )
+    //     .optopt(
+    //         "w",
+    //         "wrap",
+    //         "wrap encoded lines after COLS character (default 76, 0 to disable wrapping)",
+    //         "COLS",
+    //     )
+    //     .parse(args);
+
+    // let line_wrap = matches.opt_str("wrap").map(|s| match s.parse() {
+    //     Ok(n) => n,
+    //     Err(e) => {
+    //         crash!(1, "invalid wrap size: ‘{}’: {}", s, e);
+    //     }
+    // });
+    // let ignore_garbage = matches.opt_present("ignore-garbage");
+    // let decode = matches.opt_present("decode");
+
+    // if matches.free.len() > 1 {
+    //     show_usage_error!("extra operand ‘{}’", matches.free[0]);
+    //     return 1;
+    // }
+
+    // if matches.free.is_empty() || &matches.free[0][..] == "-" {
+    //     let stdin_raw = stdin();
+    //     handle_input(
+    //         &mut stdin_raw.lock(),
+    //         format,
+    //         line_wrap,
+    //         ignore_garbage,
+    //         decode,
+    //     );
+    // } else {
+    //     let path = Path::new(matches.free[0].as_str());
+    //     let file_buf = safe_unwrap!(File::open(&path));
+    //     let mut input = BufReader::new(file_buf);
+    //
+    // };
+
     0
 }
 

tests/by-util/test_base32.rs

@@ -71,8 +71,7 @@ fn test_wrap() {
 fn test_wrap_no_arg() {
     for wrap_param in vec!["-w", "--wrap"] {
         new_ucmd!().arg(wrap_param).fails().stderr_only(format!(
-            "base32: error: Argument to option '{}' missing\n",
-            if wrap_param == "-w" { "w" } else { "wrap" }
+            "error: The argument '--wrap <wrap>\' requires a value but none was supplied\n\nUSAGE:\n    base32 [OPTION]... [FILE]\n\nFor more information try --help"
         ));
     }
 }
@@ -87,3 +86,21 @@ fn test_wrap_bad_arg() {
             .stderr_only("base32: error: invalid wrap size: ‘b’: invalid digit found in string\n");
     }
 }
+
+#[test]
+fn test_base32_extra_operand() {
+    // Expect a failure when multiple files are specified.
+    new_ucmd!()
+        .arg("a.txt")
+        .arg("a.txt")
+        .fails()
+        .stderr_only("base32: error: extra operand ‘a.txt’");
+}
+
+#[test]
+fn test_base32_file_not_found() {
+    new_ucmd!()
+        .arg("a.txt")
+        .fails()
+        .stderr_only("base32: error: a.txt: No such file or directory");
+}