mkdir as needed

README.md

@@ -9,10 +9,15 @@ npm install map-file
 
 ### <code>mapFile({from, to, map=<var>identity</var>}, callback=<var>done</var>)</code>
 
-- `from` is the reading filename. It may be relative or absolute.
-- `to` is the writing filename. It may be relative or absolute.
-- `map` is the function you use to map the content. The default returns the original text.
-- `callback` is a function to call after mapping. The default throws errors and logs success.
+- `from` is the reading filename
+  - supports relative or absolute
+- `to` is the writing filename
+  - supports relative or absolute
+  - makes nonexistent directories via `fs.mkdir`
+- `map` is the function you use to map the content
+  - default returns the original text
+- `callback` is a function to call after mapping
+  - default throws errors and logs success
 
 ## Usage
 

map-file.js

@@ -1,21 +1,31 @@
 const fs = require("fs")
 const path = require("path")
 const utf8 = "utf8"
+const made = dir => "." === dir || fs.existsSync(path.resolve(dir))
 const same = text => text
 const done = file => err => {
   if (err) throw err
   console.log("Wrote:", file)
 }
 
-const mapFile = ({from, to, map = same}, cb) => {
-  if (void 0 === cb) cb = done(to)
-  from = path.resolve(from)
-  to = path.resolve(to)
-  fs.readFile(from, utf8, (err, text) => {
+const mapFile = ({from, to, map=same}, cb=done(to)) => {
+  const write = text => {
+    fs.writeFile(path.resolve(to), text, utf8, cb)
+  }
+
+  fs.readFile(path.resolve(from), utf8, (err, text) => {
     if (err) throw err
     text = map(text)
-    if (void 0 === text) cb(new Error("text => undefined"))
-    else fs.writeFile(to, text, utf8, cb)
+    if (void 0 === text) {
+      cb(new Error("text => undefined"))
+    } else {
+      const destination = path.dirname(to)
+      if (made(destination)) write(text)
+      else fs.mkdir(path.resolve(destination), err => {
+        if (err) throw err
+        write(text)
+      })
+    }
   })
 }
 

test.js

@@ -1,23 +1,51 @@
 const mapFile = require("./")
 const assert = require("assert")
 const fs = require("fs")
-const from = "test-read.txt"
-const to = "test-write.txt"
+const cp = require("child_process")
+const path = require("path")
 const utf8 = "utf8"
-const transform = text => text.toLowerCase()
+const folder = "test-folder"
+const from = `${folder}/test-read.txt`
+const original = "HELLO"
+const method = "toLowerCase"
+const transform = text => text[method]()
+const cases = [
+  `${folder}/test-write.txt`,
+  `${folder}/deep/test-write.txt`
+]
 
-fs.readFile(from, utf8, (err, original) => {
-  mapFile({ from, to, map: text => {
-    assert.strictEqual(text, original)
-    console.log(from, original.trim())
-    return transform(text)
-  }}, err => {
+cp.exec(`rm -rf ${folder} && mkdir ${folder}`, err => {
+  if (err) throw err
+  console.log("created:", folder)
+  console.log()
+  fs.writeFile(path.resolve(from), original, err => {
     if (err) throw err
-    fs.readFile(to, utf8, (err, output) => {
+    cases.forEach(to => {
+      mapFile({ from, to, map: text => {
+        assert.strictEqual(text, original)
+        console.log("read:", from)
+        console.log("text:", original.trim())
+        console.log()
+        return transform(text)
+      }}, err => {
+        if (err) throw err
+        fs.readFile(to, utf8, (err, output) => {
+          if (err) throw err
+          assert.strictEqual(output, transform(original))
+          console.log("map:", method)
+          console.log("wrote:", to)
+          console.log("text:", output.trim())
+          console.log()
+        })
+      })
+    })
+    cp.exec(`rm -rf ${folder}`, err => {
       if (err) throw err
-      console.log(to, output.trim())
-      assert.strictEqual(output, transform(original))
-      console.log("Tests passed =)")
+      console.log("deleted:", folder)
+      console.log()
+      console.log("tests: passed =)")
+      console.log(`node: ${process.version}`)
+      console.log()
     })
   })
 })