fix: use input python version if compatible

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
         os: ["windows-latest", "ubuntu-latest"]
     name: Test the action
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Setup PDM
         uses: ./
         with:

package.json

@@ -13,6 +13,7 @@
   "dependencies": {
     "@actions/core": "^1.2.6",
     "@actions/exec": "^1.0.4",
+    "semver": "^7.3.7",
     "setup-python": "actions/setup-python"
   },
   "devDependencies": {

src/setup-pdm.ts

@@ -1,79 +1,60 @@
-import * as core from "@actions/core";
-import * as exec from "@actions/exec";
-import * as setupPython from "setup-python/src/find-python";
-import { IS_WINDOWS } from "setup-python/src/utils";
-import * as os from "os";
-import { exec as execChild } from "child_process";
-import { promises as fs } from "fs";
-import path from "path";
+import * as core from '@actions/core'
+import * as exec from '@actions/exec'
+import * as setupPython from 'setup-python/src/find-python'
+import { IS_WINDOWS } from 'setup-python/src/utils'
+import * as os from 'os'
+import { promises as fs } from 'fs'
+import path from 'path'
+import semParse from 'semver/functions/parse'
+import semIntersect from 'semver/ranges/intersects'
 
-const INSTALL_VERSION = "3.8";
-const GITHUB_REPO = "https://github.com/pdm-project/pdm.git";
+const PDM_PYTHON_REQUIRES = '>=3.7'
+const FALLBACK_INSTALL_VERSION = '3.10'
+const GITHUB_REPO = 'https://github.com/pdm-project/pdm.git'
 
-function getPep582Path(): string {
-  const installDir = process.env.pythonLocation || "";
+function getPep582Path(version: string): string {
+  const installDir = process.env.pythonLocation || ''
+  const parsedVersion = semParse(version)!
   if (IS_WINDOWS) {
-    return path.resolve(installDir, "Lib/site-packages/pdm/pep582");
+    return path.resolve(installDir, 'Lib/site-packages/pdm/pep582')
   } else {
-    return path.resolve(
-      installDir,
-      "lib",
-      `python${INSTALL_VERSION}`,
-      "site-packages/pdm/pep582"
-    );
+    return path.resolve(installDir, 'lib', `python${parsedVersion.major}.${parsedVersion.minor}`, 'site-packages/pdm/pep582')
   }
 }
 
 async function run(): Promise<void> {
-  const arch = core.getInput("architecture") || os.arch();
-  const pdmVersion = core.getInput("version");
-  const ref = core.getInput("ref");
-  const pdmPackage = pdmVersion
-    ? `pdm==${pdmVersion}`
-    : ref
-    ? `pdm @ git+${GITHUB_REPO}@${ref}`
-    : "pdm";
-  const cmdArgs = ["-m", "pip", "install", "-U", pdmPackage];
-  if (core.getInput("prerelease") === "true") {
-    cmdArgs.push("--pre");
+  const arch = core.getInput('architecture') || os.arch()
+  const pdmVersion = core.getInput('version')
+  const pythonVersion = core.getInput('python-version')
+  const versionCompatible = semIntersect(PDM_PYTHON_REQUIRES, pythonVersion)
+  const ref = core.getInput('ref')
+  const pdmPackage = pdmVersion ? `pdm==${pdmVersion}` : ref ? `pdm @ git+${GITHUB_REPO}@${ref}` : 'pdm'
+  const cmdArgs = ['-m', 'pip', 'install', '-U', pdmPackage]
+  if (core.getInput('prerelease') === 'true') {
+    cmdArgs.push('--pre')
   }
   try {
-    let installedPython = await setupPython.findPythonVersion(
-      INSTALL_VERSION,
-      arch
-    );
-    await exec.exec("python", cmdArgs);
-    if (core.getInput("enable-pep582") === "true") {
-      core.exportVariable("PYTHONPATH", getPep582Path());
+    let installedPython = await setupPython.findPythonVersion(versionCompatible ? pythonVersion : FALLBACK_INSTALL_VERSION, arch)
+    await exec.exec('python', cmdArgs)
+    if (core.getInput('enable-pep582') === 'true') {
+      core.exportVariable('PYTHONPATH', getPep582Path(installedPython.version))
     }
-    if (core.getInput("python-version") !== INSTALL_VERSION) {
-      installedPython = await setupPython.findPythonVersion(
-        core.getInput("python-version"),
-        arch
-      );
+    if (!versionCompatible) {
+      installedPython = await setupPython.findPythonVersion(pythonVersion, arch)
     }
-    const pythonBin = path
-      .join(
-        process.env.pythonLocation as string,
-        IS_WINDOWS ? "python.exe" : "bin/python"
-      )
-      .replace(/\\/g, "/");
-    await fs.writeFile(".pdm.toml", `[python]\npath="${pythonBin}"\n`);
-    const pdmVersionOutput = (await execChild("pdm --version")).stdout;
-    if (process.platform === "linux") {
+    const pythonBin = path.join(process.env.pythonLocation as string, IS_WINDOWS ? 'python.exe' : 'bin/python').replace(/\\/g, '/')
+    await fs.writeFile('.pdm.toml', `[python]\npath="${pythonBin}"\n`)
+    const { stdout: pdmVersionOutput } = await exec.getExecOutput('pdm --version')
+    if (process.platform === 'linux') {
       // See https://github.com/actions/virtual-environments/issues/2803
-      core.exportVariable("LD_PRELOAD", "/lib/x86_64-linux-gnu/libgcc_s.so.1");
+      core.exportVariable('LD_PRELOAD', '/lib/x86_64-linux-gnu/libgcc_s.so.1')
     }
-    core.info(
-      `Successfully setup ${
-        pdmVersionOutput && pdmVersionOutput.read()
-      } with Python ${installedPython.version}`
-    );
-    const matchersPath = path.join(__dirname, "..", ".github");
-    core.info(`##[add-matcher]${path.join(matchersPath, "python.json")}`);
+    core.info(`Successfully setup ${pdmVersionOutput} with Python ${installedPython.version}`)
+    const matchersPath = path.join(__dirname, '..', '.github')
+    core.info(`##[add-matcher]${path.join(matchersPath, 'python.json')}`)
   } catch (error: any) {
-    core.setFailed(error.message);
+    core.setFailed(error.message)
   }
 }
 
-run();
+run()