Add support for pep440 version specifiers (#150)

Fixes: #147

src/download/download-version.ts

@@ -3,6 +3,7 @@ import * as tc from "@actions/tool-cache";
 import * as path from "node:path";
 import { promises as fs } from "node:fs";
 import * as semver from "semver";
+import * as pep440 from "@renovatebot/pep440";
 import { OWNER, REPO, TOOL_CACHE_NAME } from "../utils/constants";
 import type { Architecture, Platform } from "../utils/platforms";
 import { validateChecksum } from "./checksum/checksum";
@@ -124,8 +125,8 @@ export async function resolveVersion(
     return version;
   }
   const availableVersions = await getAvailableVersions(githubToken);
-  const resolvedVersion = tc.evaluateVersions(availableVersions, version);
-  if (resolvedVersion === "") {
+  const resolvedVersion = maxSatisfying(availableVersions, version);
+  if (resolvedVersion === undefined) {
     throw new Error(`No version found for ${version}`);
   }
   core.debug(`Resolved version: ${resolvedVersion}`);
@@ -195,3 +196,22 @@ async function getLatestRelease(
   });
   return latestRelease;
 }
+
+function maxSatisfying(
+  versions: string[],
+  version: string,
+): string | undefined {
+  const maxSemver = tc.evaluateVersions(versions, version);
+  if (maxSemver !== "") {
+    core.debug(`Found a version that satisfies the semver range: ${maxSemver}`);
+    return maxSemver;
+  }
+  const maxPep440 = pep440.maxSatisfying(versions, version);
+  if (maxPep440 !== null) {
+    core.debug(
+      `Found a version that satisfies the pep440 specifier: ${maxPep440}`,
+    );
+    return maxPep440;
+  }
+  return undefined;
+}