From 5c54e928cce9179ba26fd77ea42a5558fff2867b Mon Sep 17 00:00:00 2001
From: Clayton Watts <cletusw@gmail.com>
Date: Thu, 5 Oct 2017 10:16:42 -0600
Subject: [PATCH] feat: Plugin context option

Overrides webpack context, overridden by pattern context

Fixes #148
---
 README.md      |  3 ++-
 src/index.js   | 13 +++++++++++-
 tests/index.js | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index f866b1a4..d72a24d0 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ Or, in the simple case of just a `from` with the default destination, you can us
 | `from` | Y        |             | _examples:_<br>'relative/file.txt'<br>'/absolute/file.txt'<br>'relative/dir'<br>'/absolute/dir'<br>'\*\*/\*'<br>{glob:'\*\*/\*', dot: true}<br><br>Globs accept [minimatch options](https://github.com/isaacs/minimatch) |
 | `to`   | N        | output root if `from` is file or dir<br><br>resolved glob path if `from` is glob | _examples:_<br>'relative/file.txt'<br>'/absolute/file.txt'<br>'relative/dir'<br>'/absolute/dir'<br>'relative/[name].[ext]'<br>'/absolute/[name].[ext]'<br><br>Templates are [file-loader patterns](https://github.com/webpack/file-loader) |
 | `toType` | N | **'file'** if `to` has extension or `from` is file<br><br>**'dir'** if `from` is directory, `to` has no extension or ends in '/'<br><br>**'template'** if `to` contains [a template pattern](https://github.com/webpack/file-loader) | |
-| `context` | N | compiler.options.context | A path that determines how to interpret the `from` path |
+| `context` | N | options.context \|\| compiler.options.context | A path that determines how to interpret the `from` path |
 | `flatten` | N | false | Removes all directory references and only copies file names<br><br>If files have the same name, the result is non-deterministic |
 | `ignore` | N | [] | Additional globs to ignore for this pattern |
 | `transform` | N | function(content, path) {<br>&nbsp;&nbsp;return content;<br>} | Function that modifies file contents before writing to webpack |
@@ -47,6 +47,7 @@ Or, in the simple case of just a `from` with the default destination, you can us
 
 | Name | Default | Details |
 | ---- | ------- | ------- |
+| `context` | compiler.options.context | A path that determines how to interpret the `from` path, shared for all patterns |
 | `ignore` | [] | Array of globs to ignore (applied to `from`) |
 | `copyUnmodified` | false | Copies files, regardless of modification when using watch or webpack-dev-server. All files are copied on first build, regardless of this option. |
 | `debug` | **'warning'** | _options:_<br>**'warning'** - only warnings<br>**'info'** or true - file location and read info<br>**'debug'** - very detailed debugging info
diff --git a/src/index.js b/src/index.js
index 097543f5..46d4159f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,4 +1,5 @@
 import Promise from 'bluebird';
+import path from 'path';
 import _ from 'lodash';
 import preProcessPattern from './preProcessPattern';
 import processPattern from './processPattern';
@@ -46,6 +47,16 @@ function CopyWebpackPlugin(patterns = [], options = {}) {
         let contextDependencies;
         const written = {};
 
+        let context;
+
+        if (!options.context) {
+            context = compiler.options.context;
+        } else if (!path.isAbsolute(options.context)) {
+            context = path.join(compiler.options.context, options.context);
+        } else {
+            context = options.context;
+        }
+
         compiler.plugin('emit', (compilation, cb) => {
             debug('starting emit');
             const callback = () => {
@@ -64,7 +75,7 @@ function CopyWebpackPlugin(patterns = [], options = {}) {
                 written,
                 fileDependencies,
                 contextDependencies,
-                context: compiler.options.context,
+                context,
                 output: compiler.options.output.path,
                 ignore: options.ignore || [],
                 copyUnmodified: options.copyUnmodified,
diff --git a/tests/index.js b/tests/index.js
index cb66a021..ccd53ae0 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -1227,5 +1227,59 @@ describe('apply function', () => {
                 .catch(done);
             });
         });
+
+        describe('context', () => {
+            it('overrides webpack config context with absolute path', (done) => {
+                runEmit({
+                    expectedAssetKeys: [
+                        'newdirectory/nestedfile.txt'
+                    ],
+                    options: {
+                        context: path.resolve(HELPER_DIR, 'directory')
+                    },
+                    patterns: [{
+                        from: 'nested',
+                        to: 'newdirectory'
+                    }]
+                })
+                .then(done)
+                .catch(done);
+            });
+
+            it('overrides webpack config context with relative path', (done) => {
+                runEmit({
+                    expectedAssetKeys: [
+                        'newdirectory/nestedfile.txt'
+                    ],
+                    options: {
+                        context: 'directory'
+                    },
+                    patterns: [{
+                        from: 'nested',
+                        to: 'newdirectory'
+                    }]
+                })
+                .then(done)
+                .catch(done);
+            });
+
+            it('is overridden by pattern context', (done) => {
+                runEmit({
+                    expectedAssetKeys: [
+                        'newdirectory/nestedfile.txt'
+                    ],
+                    options: {
+                        context: 'directory'
+                    },
+                    patterns: [{
+                        context: 'nested',
+                        from: '.',
+                        to: 'newdirectory'
+                    }]
+                })
+                .then(done)
+                .catch(done);
+            });
+        });
     });
 });