1 files changed, 51 insertions, 0 deletions
diff --git a/date-fns/scripts/build/fp.js b/date-fns/scripts/build/fp.js
new file mode 100755
index 0000000..f3e5a5a
--- /dev/null
+++ b/date-fns/scripts/build/fp.js
@@ -0,0 +1,51 @@
+#!/usr/bin/env node
+
+/**
+ * @file
+ * The script generates the FP functions using the docs JSON file.
+ *
+ * It's a part of the build process.
+ */
+
+const fs = require('fs')
+const path = require('path')
+const prettier = require('./_lib/prettier')
+const jsDocs = require(path.resolve(process.cwd(), 'tmp/docs.json'))
+
+const generatedAutomaticallyMessage =
+  "// This file is generated automatically by `scripts/build/fp.js`. Please, don't change it."
+const FP_DIR = './src/fp'
+
+const fpFns = Object.keys(jsDocs)
+  .map((category) => jsDocs[category])
+  .reduce((previousValue, newValue) => [...previousValue, ...newValue], [])
+  .filter((doc) => doc.kind === 'function' && doc.isFPFn)
+
+buildFP(fpFns)
+
+function getFPFn(resultFnName, initialFnName, arity) {
+  return [generatedAutomaticallyMessage]
+    .concat('')
+    .concat(`import fn from '../../${initialFnName}/index'`)
+    .concat(`import convertToFP from '../_lib/convertToFP/index'`)
+    .concat('')
+    .concat(`var ${resultFnName} = convertToFP(fn, ${arity})`)
+    .concat('')
+    .concat(`export default ${resultFnName}`)
+    .concat('')
+    .join('\n')
+}
+
+function buildFPFn({ title, generatedFrom, args: { length } }) {
+  const fpFnLines = getFPFn(title, generatedFrom, length)
+  const fpFnDir = `${FP_DIR}/${title}`
+
+  if (!fs.existsSync(fpFnDir)) {
+    fs.mkdirSync(fpFnDir)
+  }
+  fs.writeFileSync(`${fpFnDir}/index.js`, prettier(fpFnLines))
+}
+
+function buildFP(fns) {
+  fns.forEach(buildFPFn)
+}