Merge pull request #1453 from da-x/rustup-doc-path

Add --path flag to 'rustup doc'

src/rustup-cli/rustup_mode.rs

@@ -369,6 +369,11 @@ pub fn cli() -> App<'static, 'static> {
                 .alias("docs")
                 .about("Open the documentation for the current toolchain")
                 .after_help(DOC_HELP)
+                .arg(
+                    Arg::with_name("path")
+                        .long("path")
+                        .help("Only print the path to the documentation"),
+                )
                 .arg(
                     Arg::with_name("book")
                         .long("book")
@@ -951,7 +956,14 @@ fn doc(cfg: &Cfg, m: &ArgMatches) -> Result<()> {
         "index.html"
     };
 
-    Ok(cfg.open_docs_for_dir(&utils::current_dir()?, doc_url)?)
+    let cwd = &utils::current_dir()?;
+    if m.is_present("path") {
+        let doc_path = try!(cfg.doc_path_for_dir(cwd, doc_url));
+        println!("{}", doc_path.display());
+        Ok(())
+    } else {
+        Ok(cfg.open_docs_for_dir(cwd, doc_url)?)
+    }
 }
 
 fn man(cfg: &Cfg, m: &ArgMatches) -> Result<()> {

tests/cli-rustup.rs

@@ -7,6 +7,7 @@ extern crate tempdir;
 
 use std::fs;
 use std::env::consts::EXE_SUFFIX;
+use std::path::MAIN_SEPARATOR;
 use std::process;
 use rustup_utils::raw;
 use rustup_mock::clitools::{self, expect_err, expect_ok, expect_ok_ex, expect_stderr_ok,
@@ -1418,3 +1419,19 @@ fn file_override_with_target_info() {
         );
     });
 }
+
+#[test]
+fn docs_with_path() {
+    setup(&|config| {
+        expect_ok(config, &["rustup", "default", "stable"]);
+
+        let mut cmd = clitools::cmd(config, "rustup", &["doc", "--path"]);
+        clitools::env(config, &mut cmd);
+        let out = cmd.output().unwrap();
+
+        let stdout = String::from_utf8(out.stdout).unwrap();
+        let path = format!("share{}doc{}rust{}html",
+            MAIN_SEPARATOR, MAIN_SEPARATOR, MAIN_SEPARATOR);
+        assert!(stdout.contains(path.as_str()));
+    });
+}