feat(python): pyenv manager (#10128)

lib/manager/api.ts

@@ -49,6 +49,7 @@ import * as pipenv from './pipenv';
 import * as poetry from './poetry';
 import * as preCommit from './pre-commit';
 import * as pub from './pub';
+import * as pyenv from './pyenv';
 import * as regex from './regex';
 import * as rubyVersion from './ruby-version';
 import * as sbt from './sbt';
@@ -115,6 +116,7 @@ api.set('pipenv', pipenv);
 api.set('poetry', poetry);
 api.set('pre-commit', preCommit);
 api.set('pub', pub);
+api.set('pyenv', pyenv);
 api.set('regex', regex);
 api.set('ruby-version', rubyVersion);
 api.set('sbt', sbt);

lib/manager/pyenv/__snapshots__/extract.spec.ts.snap

@@ -0,0 +1,31 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`manager/pyenv/extract extractPackageFile() returns a result 1`] = `
+Array [
+  Object {
+    "currentValue": "3.7.1",
+    "datasource": "docker",
+    "depName": "python",
+  },
+]
+`;
+
+exports[`manager/pyenv/extract extractPackageFile() skips non ranges 1`] = `
+Array [
+  Object {
+    "currentValue": "latestn",
+    "datasource": "docker",
+    "depName": "python",
+  },
+]
+`;
+
+exports[`manager/pyenv/extract extractPackageFile() supports ranges 1`] = `
+Array [
+  Object {
+    "currentValue": "3.8",
+    "datasource": "docker",
+    "depName": "python",
+  },
+]
+`;

lib/manager/pyenv/extract.spec.ts

@@ -0,0 +1,19 @@
+import { getName } from '../../../test/util';
+import { extractPackageFile } from './extract';
+
+describe(getName(), () => {
+  describe('extractPackageFile()', () => {
+    it('returns a result', () => {
+      const res = extractPackageFile('3.7.1\n');
+      expect(res.deps).toMatchSnapshot();
+    });
+    it('supports ranges', () => {
+      const res = extractPackageFile('3.8\n');
+      expect(res.deps).toMatchSnapshot();
+    });
+    it('skips non ranges', () => {
+      const res = extractPackageFile('latestn');
+      expect(res.deps).toMatchSnapshot();
+    });
+  });
+});

lib/manager/pyenv/extract.ts

@@ -0,0 +1,11 @@
+import * as datasourceDocker from '../../datasource/docker';
+import type { PackageDependency, PackageFile } from '../types';
+
+export function extractPackageFile(content: string): PackageFile {
+  const dep: PackageDependency = {
+    depName: 'python',
+    currentValue: content.trim(),
+    datasource: datasourceDocker.id,
+  };
+  return { deps: [dep] };
+}

lib/manager/pyenv/index.ts

@@ -0,0 +1,11 @@
+import { LANGUAGE_PYTHON } from '../../constants/languages';
+import * as dockerVersioning from '../../versioning/docker';
+
+export { extractPackageFile } from './extract';
+
+export const language = LANGUAGE_PYTHON;
+
+export const defaultConfig = {
+  fileMatch: ['(^|/).python-version$'],
+  versioning: dockerVersioning.id,
+};

lib/manager/pyenv/readme.md

@@ -0,0 +1 @@
+Simply keeps the `.python-version` file updated.