PEP 440 support

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

src/meta.ts

@@ -2,6 +2,7 @@ import * as handlebars from 'handlebars';
 import * as fs from 'fs';
 import * as path from 'path';
 import moment from 'moment';
+import * as pep440 from '@renovate/pep440';
 import * as semver from 'semver';
 import {Inputs, tmpDir} from './context';
 import {ReposGetResponseData} from './github';
@@ -62,6 +63,10 @@ export class Meta {
           version = this.procSemver(version, tag);
           break;
         }
+        case tcl.Type.Pep440: {
+          version = this.procPep440(version, tag);
+          break;
+        }
         case tcl.Type.Match: {
           version = this.procMatch(version, tag);
           break;
@@ -147,6 +152,53 @@ export class Meta {
     return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true');
   }
 
+  private procPep440(version: Version, tag: tcl.Tag): Version {
+    if (!/^refs\/tags\//.test(this.context.ref) && tag.attrs['value'].length == 0) {
+      return version;
+    }
+
+    let vraw: string;
+    if (tag.attrs['value'].length > 0) {
+      vraw = this.setGlobalExp(tag.attrs['value']);
+    } else {
+      vraw = this.context.ref.replace(/^refs\/tags\//g, '').replace(/\//g, '-');
+    }
+    if (!pep440.valid(vraw)) {
+      core.warning(`${vraw} does not conform to PEP 440. More info: https://www.python.org/dev/peps/pep-0440`);
+      return version;
+    }
+
+    let latest: boolean = false;
+    const pver = pep440.explain(vraw);
+    if (pver.is_prerelease || pver.is_postrelease || pver.is_devrelease) {
+      vraw = this.setValue(pep440.clean(vraw), tag);
+    } else {
+      vraw = this.setValue(
+        handlebars.compile(tag.attrs['pattern'])({
+          raw: function () {
+            return vraw;
+          },
+          version: function () {
+            return pep440.clean(vraw);
+          },
+          major: function () {
+            return pep440.major(vraw);
+          },
+          minor: function () {
+            return pep440.minor(vraw);
+          },
+          patch: function () {
+            return pep440.patch(vraw);
+          }
+        }),
+        tag
+      );
+      latest = true;
+    }
+
+    return Meta.setVersion(version, vraw, this.flavor.latest == 'auto' ? latest : this.flavor.latest == 'true');
+  }
+
   private procMatch(version: Version, tag: tcl.Tag): Version {
     if (!/^refs\/tags\//.test(this.context.ref) && tag.attrs['value'].length == 0) {
       return version;

src/pep440.d.ts

@@ -0,0 +1,39 @@
+interface ExplainedVersion {
+  epoch: number;
+  release: [number, number, number];
+  pre?: [string, number];
+  post?: number;
+  dev?: number;
+  local?: string;
+  public: string;
+  base_version: string;
+  is_prerelease: boolean;
+  is_devrelease: boolean;
+  is_postrelease: boolean;
+}
+
+interface Version {
+  epoch: number;
+  release: [number, number, number];
+  pre?: [string, number] | null;
+  post?: [string, number] | null;
+  dev?: [string, number] | null;
+  local?: Array<number> | null;
+  public: string;
+  base_version: string;
+}
+
+declare module '@renovate/pep440' {
+  function valid(version: string): string | null;
+  function clean(version: string): string;
+  function explain(version: string): ExplainedVersion;
+  function major(input: string): string;
+  function minor(input: string): string;
+  function patch(input: string): string;
+  function inc(input: string, release: string, preReleaseIdentifier?: string): string;
+}
+
+declare module '@renovate/pep440/lib/version' {
+  function stringify(parsed: Version): string;
+  function parse(version: string): Version;
+}

src/tag.ts

@@ -4,6 +4,7 @@ import * as core from '@actions/core';
 export enum Type {
   Schedule = 'schedule',
   Semver = 'semver',
+  Pep440 = 'pep440',
   Match = 'match',
   Edge = 'edge',
   Ref = 'ref',
@@ -42,6 +43,7 @@ export class Tag {
 export const DefaultPriorities: Record<Type, string> = {
   [Type.Schedule]: '1000',
   [Type.Semver]: '900',
+  [Type.Pep440]: '900',
   [Type.Match]: '800',
   [Type.Edge]: '700',
   [Type.Ref]: '600',
@@ -124,7 +126,8 @@ export function Parse(s: string): Tag {
       }
       break;
     }
-    case Type.Semver: {
+    case Type.Semver:
+    case Type.Pep440: {
       if (!tag.attrs.hasOwnProperty('pattern')) {
         throw new Error(`Missing pattern attribute for ${s}`);
       }