base64: Moved argument parsing to clap.

Moved argument parsing to clap and added tests to cover using "-" as
stdin, passing in too many file arguments, and updated the "wrap" error
message in the tests.

Cargo.lock

@@ -1688,6 +1688,7 @@ dependencies = [
 name = "uu_base64"
 version = "0.0.6"
 dependencies = [
+ "clap",
  "uucore",
  "uucore_procs",
 ]

src/uu/base64/Cargo.toml

@@ -15,6 +15,7 @@ edition = "2018"
 path = "src/base64.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/base64/src/base64.rs

@@ -8,12 +8,19 @@
 
 #[macro_use]
 extern crate uucore;
+
 use uucore::encoding::Format;
 use uucore::InvalidEncodingHandling;
 
+use std::fs::File;
+use std::io::{stdin, BufReader};
+use std::path::Path;
+
+use clap::{App, Arg};
+
 mod base_common;
 
-static SYNTAX: &str = "[OPTION]... [FILE]";
+static BASE64_ARG_ERROR: i32 = 1;
 static SUMMARY: &str = "Base64 encode or decode FILE, or standard input, to standard output.";
 static LONG_HELP: &str = "
  With no FILE, or when FILE is -, read standard input.
@@ -24,14 +31,128 @@ static LONG_HELP: &str = "
  to attempt to recover from any other non-alphabet bytes in the
  encoded stream.
 ";
+static VERSION: &str = env!("CARGO_PKG_VERSION");
+
+fn get_usage() -> String {
+    format!("{0} [OPTION]... [FILE]", executable!())
+}
+
+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) => {
+                let name = values.next().unwrap();
+                if values.len() != 0 {
+                    crash!(BASE64_ARG_ERROR, "extra operand ‘{}’", name);
+                }
+
+                if name == "-" {
+                    None
+                } else {
+                    if !Path::exists(Path::new(name)) {
+                        crash!(BASE64_ARG_ERROR, "{}: No such file or directory", name);
+                    }
+                    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!(BASE64_ARG_ERROR, "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,
+        }
+    }
+}
 
 pub fn uumain(args: impl uucore::Args) -> i32 {
-    base_common::execute(
-        args.collect_str(InvalidEncodingHandling::Ignore)
-            .accept_any(),
-        SYNTAX,
-        SUMMARY,
-        LONG_HELP,
-        Format::Base64,
-    )
+    let format = Format::Base64;
+    let usage = get_usage();
+    let app = App::new(executable!())
+        .version(VERSION)
+        .about(SUMMARY)
+        .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 arg_list = args
+        .collect_str(InvalidEncodingHandling::ConvertLossy)
+        .accept_any();
+    let config: Config = Config::from(app.get_matches_from(arg_list));
+    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);
+            base_common::handle_input(
+                &mut input,
+                format,
+                config.wrap_cols,
+                config.ignore_garbage,
+                config.decode,
+            );
+        }
+        // stdin
+        None => {
+            base_common::handle_input(
+                &mut stdin().lock(),
+                format,
+                config.wrap_cols,
+                config.ignore_garbage,
+                config.decode,
+            );
+        }
+    };
+
+    0
 }

src/uu/base64/src/base_common.rs

@@ -7,68 +7,11 @@
 // For the full copyright and license information, please view the LICENSE file
 // that was distributed with this source code.
 
-use std::fs::File;
-use std::io::{stdin, stdout, BufReader, Read, Write};
-use std::path::Path;
+use std::io::{stdout, Read, Write};
 
 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);
-
-    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);
-        handle_input(&mut input, format, line_wrap, ignore_garbage, decode);
-    };
-
-    0
-}
-
-fn handle_input<R: Read>(
+pub fn handle_input<R: Read>(
     input: &mut R,
     format: Format,
     line_wrap: Option<usize>,

tests/by-util/test_base64.rs

@@ -7,6 +7,21 @@ fn test_encode() {
         .pipe_in(input)
         .succeeds()
         .stdout_only("aGVsbG8sIHdvcmxkIQ==\n");
+
+    // Using '-' as our file
+    new_ucmd!()
+        .arg("-")
+        .pipe_in(input)
+        .succeeds()
+        .stdout_only("aGVsbG8sIHdvcmxkIQ==\n");
+}
+
+#[test]
+fn test_base64_encode_file() {
+    new_ucmd!()
+        .arg("input-simple.txt")
+        .succeeds()
+        .stdout_only("SGVsbG8sIFdvcmxkIQo=\n");
 }
 
 #[test]
@@ -60,10 +75,9 @@ fn test_wrap() {
 #[test]
 fn test_wrap_no_arg() {
     for wrap_param in vec!["-w", "--wrap"] {
-        new_ucmd!().arg(wrap_param).fails().stderr_only(format!(
-            "base64: error: Argument to option '{}' missing\n",
-            if wrap_param == "-w" { "w" } else { "wrap" }
-        ));
+        new_ucmd!().arg(wrap_param).fails().stderr_contains(
+            &"The argument '--wrap <wrap>' requires a value but none was supplied",
+        );
     }
 }
 
@@ -77,3 +91,21 @@ fn test_wrap_bad_arg() {
             .stderr_only("base64: error: invalid wrap size: ‘b’: invalid digit found in string\n");
     }
 }
+
+#[test]
+fn test_base64_extra_operand() {
+    // Expect a failure when multiple files are specified.
+    new_ucmd!()
+        .arg("a.txt")
+        .arg("a.txt")
+        .fails()
+        .stderr_only("base64: error: extra operand ‘a.txt’");
+}
+
+#[test]
+fn test_base64_file_not_found() {
+    new_ucmd!()
+        .arg("a.txt")
+        .fails()
+        .stderr_only("base64: error: a.txt: No such file or directory");
+}

tests/fixtures/base64/input-simple.txt

@@ -0,0 +1 @@
+Hello, World!