More convenient run_with_output

Author: matklad

xtask/src/cmd.rs

@@ -18,7 +18,7 @@ impl Cmd<'_> {
             run(self.unix, self.work_dir)
         }
     }
-    pub fn run_with_output(self) -> Result<Output> {
+    pub fn run_with_output(self) -> Result<String> {
         if cfg!(windows) {
             run_with_output(self.windows, self.work_dir)
         } else {
@@ -34,8 +34,10 @@ pub fn run(cmdline: &str, dir: &str) -> Result<()> {
     .map(|_| ())
 }
 
-pub fn run_with_output(cmdline: &str, dir: &str) -> Result<Output> {
-    do_run(cmdline, dir, &mut |_| {})
+pub fn run_with_output(cmdline: &str, dir: &str) -> Result<String> {
+    let output = do_run(cmdline, dir, &mut |_| {})?;
+    let stdout = String::from_utf8(output.stdout)?;
+    Ok(stdout)
 }
 
 fn do_run(cmdline: &str, dir: &str, f: &mut dyn FnMut(&mut Command)) -> Result<Output> {

xtask/src/install.rs

@@ -127,15 +127,12 @@ fn install_client(ClientOpt::VsCode: ClientOpt) -> Result<()> {
     }
     .run()?;
 
-    let installed_extensions = {
-        let output = Cmd {
-            unix: &format!(r"{} --list-extensions", code_binary),
-            windows: &format!(r"cmd.exe /c {}.cmd --list-extensions", code_binary),
-            work_dir: ".",
-        }
-        .run_with_output()?;
-        String::from_utf8(output.stdout)?
-    };
+    let installed_extensions = Cmd {
+        unix: &format!(r"{} --list-extensions", code_binary),
+        windows: &format!(r"cmd.exe /c {}.cmd --list-extensions", code_binary),
+        work_dir: ".",
+    }
+    .run_with_output()?;
 
     if !installed_extensions.contains("rust-analyzer") {
         anyhow::bail!(
@@ -161,12 +158,10 @@ fn install_client(ClientOpt::VsCode: ClientOpt) -> Result<()> {
 
 fn install_server(opts: ServerOpt) -> Result<()> {
     let mut old_rust = false;
-    if let Ok(output) = run_with_output("cargo --version", ".") {
-        if let Ok(stdout) = String::from_utf8(output.stdout) {
-            println!("{}", stdout);
-            if !check_version(&stdout, REQUIRED_RUST_VERSION) {
-                old_rust = true;
-            }
+    if let Ok(stdout) = run_with_output("cargo --version", ".") {
+        println!("{}", stdout);
+        if !check_version(&stdout, REQUIRED_RUST_VERSION) {
+            old_rust = true;
         }
     }
 

xtask/src/pre_commit.rs

@@ -14,7 +14,7 @@ pub fn run_hook() -> Result<()> {
     let diff = run_with_output("git diff --diff-filter=MAR --name-only --cached", ".")?;
 
     let root = project_root();
-    for line in String::from_utf8(diff.stdout)?.lines() {
+    for line in diff.lines() {
         run(&format!("git update-index --add {}", root.join(line).to_string_lossy()), ".")?;
     }