1 files changed, 178 insertions, 0 deletions

diff --git a/xtask/src/install.rs b/xtask/src/install.rs
new file mode 100644
index 000000000..c5bb7351a
--- /dev/null
+++ b/xtask/src/install.rs
@@ -0,0 +1,178 @@
+//! Installs rust-analyzer language server and/or editor plugin.
+
+use std::{env, path::PathBuf, str};
+
+use anyhow::{Context, Result};
+
+use crate::cmd::{run, run_with_output, Cmd};
+
+// Latest stable, feel free to send a PR if this lags behind.
+const REQUIRED_RUST_VERSION: u32 = 40;
+
+pub struct InstallCmd {
+    pub client: Option<ClientOpt>,
+    pub server: Option<ServerOpt>,
+}
+
+pub enum ClientOpt {
+    VsCode,
+}
+
+pub struct ServerOpt {
+    pub jemalloc: bool,
+}
+
+impl InstallCmd {
+    pub fn run(self) -> Result<()> {
+        if cfg!(target_os = "macos") {
+            fix_path_for_mac().context("Fix path for mac")?
+        }
+        if let Some(server) = self.server {
+            install_server(server).context("install server")?;
+        }
+        if let Some(client) = self.client {
+            install_client(client).context("install client")?;
+        }
+        Ok(())
+    }
+}
+
+fn fix_path_for_mac() -> Result<()> {
+    let mut vscode_path: Vec<PathBuf> = {
+        const COMMON_APP_PATH: &str =
+            r"/Applications/Visual Studio Code.app/Contents/Resources/app/bin";
+        const ROOT_DIR: &str = "";
+        let home_dir = match env::var("HOME") {
+            Ok(home) => home,
+            Err(e) => anyhow::bail!("Failed getting HOME from environment with error: {}.", e),
+        };
+
+        [ROOT_DIR, &home_dir]
+            .iter()
+            .map(|dir| String::from(*dir) + COMMON_APP_PATH)
+            .map(PathBuf::from)
+            .filter(|path| path.exists())
+            .collect()
+    };
+
+    if !vscode_path.is_empty() {
+        let vars = match env::var_os("PATH") {
+            Some(path) => path,
+            None => anyhow::bail!("Could not get PATH variable from env."),
+        };
+
+        let mut paths = env::split_paths(&vars).collect::<Vec<_>>();
+        paths.append(&mut vscode_path);
+        let new_paths = env::join_paths(paths).context("build env PATH")?;
+        env::set_var("PATH", &new_paths);
+    }
+
+    Ok(())
+}
+
+fn install_client(ClientOpt::VsCode: ClientOpt) -> Result<()> {
+    let npm_version = Cmd {
+        unix: r"npm --version",
+        windows: r"cmd.exe /c npm --version",
+        work_dir: "./editors/code",
+    }
+    .run();
+
+    if npm_version.is_err() {
+        eprintln!("\nERROR: `npm --version` failed, `npm` is required to build the VS Code plugin")
+    }
+
+    Cmd { unix: r"npm install", windows: r"cmd.exe /c npm install", work_dir: "./editors/code" }
+        .run()?;
+    Cmd {
+        unix: r"npm run package --scripts-prepend-node-path",
+        windows: r"cmd.exe /c npm run package",
+        work_dir: "./editors/code",
+    }
+    .run()?;
+
+    let code_binary = ["code", "code-insiders", "codium"].iter().find(|bin| {
+        Cmd {
+            unix: &format!("{} --version", bin),
+            windows: &format!("cmd.exe /c {}.cmd --version", bin),
+            work_dir: "./editors/code",
+        }
+        .run()
+        .is_ok()
+    });
+
+    let code_binary = match code_binary {
+        Some(it) => it,
+        None => anyhow::bail!("Can't execute `code --version`. Perhaps it is not in $PATH?"),
+    };
+
+    Cmd {
+        unix: &format!(r"{} --install-extension ./ra-lsp-0.0.1.vsix --force", code_binary),
+        windows: &format!(
+            r"cmd.exe /c {}.cmd --install-extension ./ra-lsp-0.0.1.vsix --force",
+            code_binary
+        ),
+        work_dir: "./editors/code",
+    }
+    .run()?;
+
+    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()?;
+
+    if !str::from_utf8(&output.stdout)?.contains("ra-lsp") {
+        anyhow::bail!(
+            "Could not install the Visual Studio Code extension. \
+             Please make sure you have at least NodeJS 10.x together with the latest version of VS Code installed and try again."
+        );
+    }
+
+    Ok(())
+}
+
+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 old_rust {
+        eprintln!(
+            "\nWARNING: at least rust 1.{}.0 is required to compile rust-analyzer\n",
+            REQUIRED_RUST_VERSION,
+        )
+    }
+
+    let res = if opts.jemalloc {
+        run("cargo install --path crates/ra_lsp_server --locked --force --features jemalloc", ".")
+    } else {
+        run("cargo install --path crates/ra_lsp_server --locked --force", ".")
+    };
+
+    if res.is_err() && old_rust {
+        eprintln!(
+            "\nWARNING: at least rust 1.{}.0 is required to compile rust-analyzer\n",
+            REQUIRED_RUST_VERSION,
+        )
+    }
+
+    res
+}
+
+fn check_version(version_output: &str, min_minor_version: u32) -> bool {
+    // Parse second the number out of
+    //      cargo 1.39.0-beta (1c6ec66d5 2019-09-30)
+    let minor: Option<u32> = version_output.split('.').nth(1).and_then(|it| it.parse().ok());
+    match minor {
+        None => true,
+        Some(minor) => minor >= min_minor_version,
+    }
+}