feat: python.ts

python-ts/main.ts

@@ -1,6 +1,15 @@
 #!/usr/bin/env runts -- --allow-env --allow-run
 
+import {
+    existsPath,
+    joinPath,
+    log,
+    readFileToString,
+    resolveFilename,
+} from "https://global.hatter.ink/script/get/@12/deno-commons-mod.ts";
+
 const PYTHON_CONFIG_FILE = "~/.config/python-config.json";
+const PYTHON_VENV_DEFAULT_BASE_DIR = "~/.venv/";
 
 interface PythonConfig {
     default_version?: string;
@@ -22,6 +31,51 @@ interface PythonVenv {
     comment?: string;
 }
 
+async function loadPythonConfig(): Promise<PythonConfig> {
+    const pythonConfigFile = resolveFilename(PYTHON_CONFIG_FILE);
+    const pythonConfigJson = await readFileToString(pythonConfigFile);
+    if (!pythonConfigJson === null) {
+        throw `Could not read python config file: ${pythonConfigFile}`;
+    }
+    return JSON.parse(pythonConfigJson) as PythonConfig;
+}
+
+async function newVirtualEnv(pythonVersion: string | null, pythonVenv: string) {
+    const pythonConfig = await loadPythonConfig();
+    const selectedPythonVersion = pythonVersion ||
+        pythonConfig.default_version || null;
+    if (!selectedPythonVersion) {
+        throw `No Python version assigned.`;
+    }
+    if (!selectedPythonVersion) {
+        throw `No Python venv assigned.`;
+    }
+    const pythonVersionProfile = pythonConfig.versions[pythonVersion];
+    if (!pythonVersionProfile) {
+        throw `Python version: ${pythonVersion} not found`;
+    }
+    log.success(`Found Python version: ${pythonVersion}`);
+    const pythonVenvProfile = pythonConfig.profiles[pythonVenv];
+    if (pythonVenvProfile) {
+        throw `Python venv already exists: ${pythonVenv}`;
+    }
+    const pythonVenvBaseDir = resolveFilename(
+        pythonConfig.python_venv_base_path || PYTHON_VENV_DEFAULT_BASE_DIR,
+    );
+    if (!existsPath(pythonVenvBaseDir)) {
+        log.info(`Make python venv base dir: ${pythonVenvBaseDir}`);
+        Deno.mkdirSync(pythonVenvBaseDir);
+    }
+    const pythonVenvDir = joinPath(pythonVenvBaseDir, pythonVenv);
+    if (existsPath(pythonVenvDir)) {
+        throw `Python venv: ${pythonVenvDir} already exists`;
+    }
+
+    // python3 -m venv myenv
+    const python3Cmd = joinPath(pythonVersionProfile.path, "bin", "python3");
+    const pythonVenvArgs = ["-m", "vent", pythonVenvDir];
+}
+
 async function main() {
     // TODO ...
 }