Update chapter 2

Author: rakurame96

cli-book/echor/Cargo.toml

@@ -5,3 +5,9 @@ edition = "2021"
 
 [dependencies]
 clap = "4.5.23"
+
+[dev-dependencies]
+anyhow = "1.0.79"
+assert_cmd = "2.0.13"
+predicates = "3.0.4"
+pretty_assertions = "1.4.0"

cli-book/echor/mk-outs.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+OUTDIR="tests/expected"
+[[ ! -d "$OUTDIR" ]] && mkdir -p "$OUTDIR"
+
+echo    "Hello there"    > $OUTDIR/hello1.txt
+echo    "Hello"  "there" > $OUTDIR/hello2.txt
+echo -n "Hello  there"   > $OUTDIR/hello1.n.txt
+echo -n "Hello"  "there" > $OUTDIR/hello2.n.txt

cli-book/echor/src/main.rs

@@ -26,7 +26,8 @@ fn main() {
                 .value_name("TEXT")
                 .help("Input Text")
                 .required(true)
-                .num_args(1..),
+                .num_args(1..)
+                .action(ArgAction::Append),
         )
         .arg(
             Arg::new("omit_newline")
@@ -36,5 +37,18 @@ fn main() {
         )
         .get_matches();
 
-    println!("{:#?}", matches);
-}
+    // println!("{:#?}", matches);
+
+    let text: Vec<String> = matches
+        .get_many("text")
+        .expect("text is required")
+        .cloned()
+        .collect();
+
+    // println!("{:#?}", text);
+
+    let omit_newline = matches.get_flag("omit_newline");
+    // println!("{:#?}", omit_newline);
+
+    print!("{}{}", text.join(" "), if omit_newline { "" } else { "\n" });
+}

cli-book/echor/tests/cli.rs

@@ -0,0 +1,62 @@
+use assert_cmd::Command;
+use predicates::prelude::*;
+use std::fs;
+use anyhow::Result;
+
+#[test]
+fn dies_no_args() -> Result<()> {
+    let mut cmd = Command::cargo_bin("echor")?;
+    cmd.assert()
+        .failure()
+        .stderr(predicate::str::contains("Usage"));
+    Ok(())
+}
+
+#[test]
+fn hello1() -> Result<()> {
+    let expected = fs::read_to_string("tests/expected/hello1.txt")?;
+    let mut cmd = Command::cargo_bin("echor")?;
+    cmd.arg("Hello there").assert().success().stdout(expected);
+    Ok(())
+}
+
+#[test]
+fn hello2() -> Result<()> {
+    let expected = fs::read_to_string("tests/expected/hello2.txt")?;
+    let mut cmd = Command::cargo_bin("echor")?;
+    cmd.args(vec!["Hello", "there"])
+        .assert()
+        .success()
+        .stdout(expected);
+    Ok(())
+}
+
+fn run(args: &[&str], expected_file: &str) -> Result<()> {
+    let expected = fs::read_to_string(expected_file)?;
+    Command::cargo_bin("echor")?
+        .args(args)
+        .assert()
+        .success()
+        .stdout(expected);
+    Ok(())
+}
+
+// #[test]
+// fn hello1() -> Result<()> {
+//     run(&["Hello there"], "tests/expected/hello1.txt")
+// }
+
+// #[test]
+// fn hello2() -> Result<()> {
+    // run(&["Hello", "there"], "tests/expected/hello2.txt")
+// }
+
+#[test]
+fn hello1_no_newline() -> Result<()> {
+    run(&["Hello  there", "-n"], "tests/expected/hello1.n.txt") // Two spaces!
+}
+
+#[test]
+fn hello2_no_newline() -> Result<()> {
+    run(&["-n", "Hello", "there"], "tests/expected/hello2.n.txt")
+}

cli-book/echor/tests/expected/hello1.n.txt

@@ -0,0 +1 @@
+Hello  there

cli-book/echor/tests/expected/hello1.txt

@@ -0,0 +1 @@
+Hello there

cli-book/echor/tests/expected/hello2.n.txt

@@ -0,0 +1 @@
+Hello there

cli-book/echor/tests/expected/hello2.txt

@@ -0,0 +1 @@
+Hello there