Add array of resolved files support

CHANGELOG.md

@@ -5,6 +5,8 @@
 - Changed: custom resolve has more responsibility for paths resolving.
 See [resolve option](https://github.com/postcss/postcss-import#resolve) for more information about this change
 ([#116](https://github.com/postcss/postcss-import/pull/116))
+- Added: custom resolve function can return array of paths
+([#120](https://github.com/postcss/postcss-import/pull/120))
 
 # 7.1.3 - 2015-11-05
 

README.md

@@ -145,7 +145,7 @@ Type: `Function`
 Default: `null`
 
 You can overwrite the default path resolving way by setting this option.
-This function gets `(id, basedir, importOptions)` arguments and returns full path or promise resolving full path.
+This function gets `(id, basedir, importOptions)` arguments and returns full path, array of paths or promise resolving paths.
 You can use [resolve](https://github.com/substack/node-resolve) for that.
 
 #### `skipDuplicates`

index.js

@@ -255,23 +255,31 @@ function readAtImport(
   addInputToPath(options)
 
   return Promise.resolve().then(function() {
-    if (options.resolve) {
-      return options.resolve(parsedAtImport.uri, dir, options)
-    }
-    return resolveId(parsedAtImport.uri, dir, options.path)
+    var resolver = options.resolve ? options.resolve : resolveId
+    return resolver(parsedAtImport.uri, dir, options)
   }).then(function(resolved) {
-    parsedAtImport.file = resolved
-    return readImportedContent(
-      result,
-      parsedAtImport,
-      assign({}, options),
-      state,
-      media,
-      processor
-    )
+    if (!Array.isArray(resolved)) {
+      resolved = [ resolved ]
+    }
+    return Promise.all(resolved.map(function(file) {
+      return readImportedContent(
+        result,
+        parsedAtImport,
+        file,
+        assign({}, options),
+        state,
+        media,
+        processor
+      )
+    }))
   }).then(function(ignored) {
     compoundInstance(parsedAtImport)
-    return ignored
+    return ignored.reduce(function(ignored, instance) {
+      if (instance) {
+        return ignored.concat(instance)
+      }
+      return ignored
+    }, [])
   }).catch(function(err) {
     result.warn(err.message, { node: atRule })
   })
@@ -288,12 +296,12 @@ function readAtImport(
 function readImportedContent(
   result,
   parsedAtImport,
+  resolvedFilename,
   options,
   state,
   media,
   processor
 ) {
-  var resolvedFilename = parsedAtImport.file
   var atRule = parsedAtImport.node
   if (options.skipDuplicates) {
     // skip files already imported at the same scope
@@ -366,7 +374,15 @@ function readImportedContent(
   ).then(function(ignored) {
     return processor.process(newStyles).then(function(newResult) {
       result.messages = result.messages.concat(newResult.messages)
-      parsedAtImport.styles = newStyles
+      var nodes = parsedAtImport.importedNodes
+      var importedNodes = newStyles.nodes
+      if (!nodes) {
+        parsedAtImport.importedNodes = importedNodes
+      }
+      else if (importedNodes.length) {
+        importedNodes[0].raws.before = importedNodes[0].raws.before || "\n"
+        parsedAtImport.importedNodes = nodes.concat(importedNodes)
+      }
       return ignored
     })
   })
@@ -380,17 +396,13 @@ function readImportedContent(
  * @param {Object} newStyles
  */
 function compoundInstance(instance) {
-  if (
-    !instance.styles ||
-    !instance.styles.nodes ||
-    !instance.styles.nodes.length
-  ) {
+  var nodes = instance.importedNodes
+
+  if (!nodes || !nodes.length) {
     instance.node.remove()
     return
   }
 
-  var nodes = instance.styles.nodes
-
   // save styles
   nodes.forEach(function(node) {
     node.parent = undefined

lib/resolve-id.js

@@ -32,7 +32,8 @@ function resolvePromise(id, opts) {
   })
 }
 
-module.exports = function(id, base, paths) {
+module.exports = function(id, base, options) {
+  var paths = options.path
   var resolveOpts = {
     basedir: base,
     moduleDirectory: moduleDirectories,

test/fixtures/custom-resolve-array.css

@@ -0,0 +1 @@
+@import "any-path";

test/fixtures/custom-resolve-array.expected.css

@@ -0,0 +1,2 @@
+.custom-array-1 {}
+.custom-array-2 {}

test/fixtures/imports/custom-array-1.css

@@ -0,0 +1 @@
+.custom-array-1 {}

test/fixtures/imports/custom-array-2.css

@@ -0,0 +1 @@
+.custom-array-2 {}

test/import.js

@@ -171,3 +171,16 @@ test("should be able to consume modules in the custom-resolve way", t => {
     resolve: sassResolve,
   })
 })
+
+test("should be able to process array of files in the custom-resolve way", t => {
+  const arrayResolve = () => {
+    return [
+      path.resolve("fixtures/imports/custom-array-1.css"),
+      path.resolve("fixtures/imports/custom-array-2.css"),
+      path.resolve("fixtures/imports/custom-array-1.css"),
+    ]
+  }
+  return compareFixtures(t, "custom-resolve-array", {
+    resolve: arrayResolve,
+  })
+})