Support for pyenv locator (microsoft#23356)

Author: DonJayamanne

native_locator/src/conda.rs

@@ -3,6 +3,7 @@
 
 use crate::known;
 use crate::messaging;
+use crate::utils::find_python_binary_path;
 use regex::Regex;
 use std::env;
 use std::path::{Path, PathBuf};
@@ -145,19 +146,6 @@ fn find_conda_binary_on_path(environment: &impl known::Environment) -> Option<Pa
     None
 }
 
-fn find_python_binary_path(env_path: &Path) -> Option<PathBuf> {
-    let python_bin_name = if cfg!(windows) {
-        "python.exe"
-    } else {
-        "python"
-    };
-    let path_1 = env_path.join("bin").join(python_bin_name);
-    let path_2 = env_path.join("Scripts").join(python_bin_name);
-    let path_3 = env_path.join(python_bin_name);
-    let paths = vec![path_1, path_2, path_3];
-    paths.into_iter().find(|path| path.exists())
-}
-
 #[cfg(windows)]
 fn get_known_conda_locations(environment: &impl known::Environment) -> Vec<PathBuf> {
     let user_profile = environment.get_env_var("USERPROFILE".to_string()).unwrap();

native_locator/src/main.rs

@@ -13,6 +13,7 @@ mod logging;
 mod messaging;
 mod utils;
 mod windows_python;
+mod pyenv;
 
 fn main() {
     let mut dispatcher = create_dispatcher();
@@ -31,6 +32,8 @@ fn main() {
     #[cfg(windows)]
     windows_python::find_and_report(&mut dispatcher, &environment);
 
+    pyenv::find_and_report(&mut dispatcher, &environment);
+
     match now.elapsed() {
         Ok(elapsed) => {
             dispatcher.log_info(&format!(

native_locator/src/pyenv.rs

@@ -0,0 +1,115 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+use std::fs;
+use std::path::PathBuf;
+
+use crate::known;
+use crate::messaging;
+use crate::utils::find_python_binary_path;
+
+#[cfg(windows)]
+fn get_home_pyenv_dir(environment: &impl known::Environment) -> Option<String> {
+    let home = environment.get_user_home()?;
+    PathBuf::from(home)
+        .join(".pyenv")
+        .join("pyenv-win")
+        .into_os_string()
+        .into_string()
+        .ok()
+}
+
+#[cfg(unix)]
+fn get_home_pyenv_dir(environment: &impl known::Environment) -> Option<String> {
+    let home = environment.get_user_home()?;
+    PathBuf::from(home)
+        .join(".pyenv")
+        .into_os_string()
+        .into_string()
+        .ok()
+}
+
+fn get_binary_from_known_paths(environment: &impl known::Environment) -> Option<String> {
+    for known_path in environment.get_know_global_search_locations() {
+        let bin = known_path.join("pyenv");
+        if bin.exists() {
+            return bin.into_os_string().into_string().ok();
+        }
+    }
+    None
+}
+
+fn get_pyenv_dir(environment: &impl known::Environment) -> Option<String> {
+    // Check if the pyenv environment variables exist: PYENV on Windows, PYENV_ROOT on Unix.
+    // They contain the path to pyenv's installation folder.
+    // If they don't exist, use the default path: ~/.pyenv/pyenv-win on Windows, ~/.pyenv on Unix.
+    // If the interpreter path starts with the path to the pyenv folder, then it is a pyenv environment.
+    // See https://github.com/pyenv/pyenv#locating-the-python-installation for general usage,
+    // And https://github.com/pyenv-win/pyenv-win for Windows specifics.
+
+    match environment.get_env_var("PYENV_ROOT".to_string()) {
+        Some(dir) => Some(dir),
+        None => match environment.get_env_var("PYENV".to_string()) {
+            Some(dir) => Some(dir),
+            None => get_home_pyenv_dir(environment),
+        },
+    }
+}
+
+fn get_pyenv_binary(environment: &impl known::Environment) -> Option<String> {
+    let dir = get_pyenv_dir(environment)?;
+    let exe = PathBuf::from(dir).join("bin").join("pyenv");
+    if fs::metadata(&exe).is_ok() {
+        exe.into_os_string().into_string().ok()
+    } else {
+        get_binary_from_known_paths(environment)
+    }
+}
+
+pub fn find_and_report(
+    dispatcher: &mut impl messaging::MessageDispatcher,
+    environment: &impl known::Environment,
+) -> Option<()> {
+    let pyenv_dir = get_pyenv_dir(environment)?;
+
+    if let Some(pyenv_binary) = get_pyenv_binary(environment) {
+        let params = messaging::EnvManager::new(vec![pyenv_binary], None);
+        let message = messaging::EnvManagerMessage::new(params);
+        dispatcher.send_message(message);
+    }
+
+    let versions_dir = PathBuf::from(&pyenv_dir)
+        .join("versions")
+        .into_os_string()
+        .into_string()
+        .ok()?;
+
+    let pyenv_binary_for_activation = match get_pyenv_binary(environment) {
+        Some(binary) => binary,
+        None => "pyenv".to_string(),
+    };
+    for entry in fs::read_dir(&versions_dir).ok()? {
+        if let Ok(path) = entry {
+            let path = path.path();
+            if path.is_dir() {
+                if let Some(executable) = find_python_binary_path(&path) {
+                    let version = path.file_name().unwrap().to_string_lossy().to_string();
+                    dispatcher.send_message(messaging::PythonEnvironment::new(
+                        "Python".to_string(),
+                        vec![executable.into_os_string().into_string().unwrap()],
+                        "Pyenv".to_string(),
+                        Some(version.clone()),
+                        Some(vec![
+                            pyenv_binary_for_activation.clone(),
+                            "shell".to_string(),
+                            version,
+                        ]),
+                        Some(path.into_os_string().into_string().unwrap()),
+                    ));
+                }
+            }
+        }
+    }
+
+    None
+}

native_locator/src/utils.rs

@@ -1,7 +1,10 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
-use std::process::Command;
+use std::{
+    path::{Path, PathBuf},
+    process::Command,
+};
 
 fn get_version_impl(path: &str) -> Option<String> {
     let output = Command::new(path)
@@ -32,3 +35,16 @@ pub fn get_version(path: &str) -> Option<String> {
     }
     get_version_impl(path)
 }
+
+pub fn find_python_binary_path(env_path: &Path) -> Option<PathBuf> {
+    let python_bin_name = if cfg!(windows) {
+        "python.exe"
+    } else {
+        "python"
+    };
+    let path_1 = env_path.join("bin").join(python_bin_name);
+    let path_2 = env_path.join("Scripts").join(python_bin_name);
+    let path_3 = env_path.join(python_bin_name);
+    let paths = vec![path_1, path_2, path_3];
+    paths.into_iter().find(|path| path.exists())
+}