feat: support advanced substitutions in replacers (#1517)

Author: cchanche

README.md

@@ -376,8 +376,13 @@ replacers:
     replace: 'https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-$1-$2'
   - search: 'myname'
     replace: 'My Name'
+  - search: '/- ([a-z])/g'
+    replace: '- \u$1' # Uppercase the first letter of each changelog entry
 ```
 
+`search` will be parsed to a RegExp, and `replace` supports substitution in the
+[same flavour VSCode does](https://code.visualstudio.com/docs/editing/codebasics#_case-changing-in-regex-replace).
+
 ## Autolabeler
 
 You can add automatically a label into a pull request, with the `autolabeler`

badges/coverage.svg

@@ -0,0 +1,5 @@
+export {
+  type NestedTemplate,
+  renderTemplate,
+  type Template,
+} from './render-template'

dist/actions/drafter/run.js

@@ -1,4 +1,24 @@
-import type { ParsedConfig } from '../../config'
+import type { ParsedConfig } from 'src/actions/drafter/config'
+import { parseReplaceString } from './util'
+
+type TemplateReplacer = NonNullable<ParsedConfig['replacers']>[number]
+
+const getReplaceMatches = (args: unknown[]): string[] => {
+  const lastArg = args[args.length - 1]
+  const hasGroups = typeof lastArg === 'object' && lastArg !== null
+  const matchCount = args.length - (hasGroups ? 3 : 2)
+
+  return args.slice(0, matchCount) as string[]
+}
+
+const applyReplacer = (input: string, replacer: TemplateReplacer): string => {
+  const replacePattern = parseReplaceString(replacer.replace)
+
+  return input.replace(replacer.search, (...args) => {
+    const matches = getReplaceMatches(args)
+    return replacePattern.buildReplaceString(matches)
+  })
+}
 
 export type Template = {
   [key: `$${Uppercase<string>}`]:
@@ -52,8 +72,8 @@ export const renderTemplate = (params: {
   })
 
   if (replacers) {
-    for (const { search, replace } of replacers) {
-      input = input.replace(search, replace)
+    for (const replacer of replacers) {
+      input = applyReplacer(input, replacer)
     }
   }