it compiled

src/readmefile.ts

@@ -0,0 +1,61 @@
+import { readdirSync, readFileSync, writeFileSync } from 'fs'
+import { UserScriptMetaFull } from './types'
+
+export interface readmeData {
+    meta: UserScriptMetaFull
+    error: string | null
+}
+
+export function updateReadmeFile(fileList: readmeData[]) {
+    let readmeFile = getReadmeFileName()
+    if (readmeFile !== null) {
+        let [readmeStart, readmeEnd] = readReadmeFile(readmeFile)
+
+        let installLinks = fileList.map(readmeDataToString).join('\n')
+
+        let installLinksAll = `
+<!-- START INSTALL LINKS -->
+## Installs
+
+${installLinks}
+<!-- END INSTALL LINKS -->
+`
+
+        let content = [readmeStart, installLinksAll, readmeEnd].join('\n')
+        writeFileSync(readmeFile, content)
+    }
+}
+
+function readmeDataToString(readmeData: readmeData): string {
+    let { meta, error } = readmeData
+    let errStr = error !== null ? '~~' : ''
+    let errMsg = error !== null ? `\n  - ${error}` : ''
+    return `- ${errStr}[${meta.name}](${meta.downloadURL})})${errStr}${errMsg}`
+}
+
+function getReadmeFileName(): string | null {
+    let files = readdirSync('.')
+    for (let name of files) {
+        if (/^readme\.md$/i.test(name)) {
+            return name
+        }
+    }
+    return null
+}
+
+function readReadmeFile(readmeFile: string): [string, string] {
+    let content = readFileSync(readmeFile).toString()
+    const regex =
+        /<!-- START INSTALL LINKS -->(?:.|\n)*?<!-- END INSTALL LINKS -->/
+    const index = regex.exec(content)?.index
+
+    if (index === undefined) {
+        if (!content.endsWith('\n')) {
+            content += '\n'
+        }
+        return [content, '']
+    }
+
+    content = content.replace(regex, '')
+    return [content.slice(0, index), content.slice(index)]
+}