override slimPatterns instead of appending

README.md

@@ -107,7 +107,7 @@ except ImportError:
 _Works on non 'win32' environments: Docker, WSL are included_  
 To remove the tests, information and caches from the installed packages, 
 enable the `slim` option. This will: `strip` the `.so` files, remove `__pycache__` 
-directories and `dist-info` directories.  
+and `dist-info` directories as well as `.pyc` and `.pyo` files.  
 ```yaml
 custom:
   pythonRequirements:
@@ -116,7 +116,8 @@ custom:
 #### Custom Removal Patterns  
 To specify additional directories to remove from the installed packages, 
 define a list of patterns in the serverless config using the `slimPatterns`
-option and glob syntax. Note, it matches against whole paths, so to match a file in any
+option and glob syntax. These paterns will be added to the default ones (`**/*.py[c|o]`, `**/__pycache__*`, `**/*.dist-info*`).
+Note, the glob syntax matches against whole paths, so to match a file in any
 directory, start your pattern with `**/`.
 ```yaml
 custom:
@@ -125,6 +126,15 @@ custom:
     slimPatterns:
       - "**/*.egg-info*"
 ```  
+To overwrite the default patterns set the option `slimPatternsAppendDefaults` to `false` (`true` by default).
+```yaml
+custom:
+  pythonRequirements:
+    slim: true
+    slimPatternsAppendDefaults: false
+    slimPatterns:
+      - "**/*.egg-info*"
+```  
 This will remove all folders within the installed requirements that match 
 the names in `slimPatterns`  
 ## Omitting Packages 

index.js

@@ -29,6 +29,7 @@ class ServerlessPythonRequirements {
       {
         slim: false,
         slimPatterns: false,
+        slimPatternsAppendDefaults: true,
         zip: false,
         cleanupZipHelper: true,
         invalidateCaches: false,
@@ -62,7 +63,7 @@ class ServerlessPythonRequirements {
       },
       (this.serverless.service.custom &&
         this.serverless.service.custom.pythonRequirements) ||
-        {}
+      {}
     );
     if (options.dockerizePip === 'non-linux') {
       options.dockerizePip = process.platform !== 'linux';
@@ -86,7 +87,7 @@ class ServerlessPythonRequirements {
       // If no dockerFile is provided, use default image
       const defaultImage = `lambci/lambda:build-${
         this.serverless.service.provider.runtime
-      }`;
+        }`;
       options.dockerImage = options.dockerImage || defaultImage;
     }
     return options;
@@ -165,7 +166,7 @@ class ServerlessPythonRequirements {
         .then(() =>
           injectAllRequirements.bind(this)(
             arguments[1].functionObj &&
-              arguments[1].functionObj.package.artifact
+            arguments[1].functionObj.package.artifact
           )
         );
     };

lib/slim.js

@@ -10,7 +10,11 @@ const getStripCommand = (options, folderPath) =>
 const deleteFiles = (options, folderPath) => {
   let patterns = ['**/*.py[c|o]', '**/__pycache__*', '**/*.dist-info*'];
   if (options.slimPatterns) {
-    patterns = patterns.concat(options.slimPatterns);
+    if (options.slimPatternsAppendDefaults === false || options.slimPatternsAppendDefaults == 'false') {
+      patterns = options.slimPatterns;
+    } else {
+      patterns = patterns.concat(options.slimPatterns);
+    }
   }
   for (const pattern of patterns) {
     for (const file of glob.sync(`${folderPath}/${pattern}`)) {

test.bats

@@ -74,6 +74,17 @@ teardown() {
     test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
 }
 
+@test "py3.6 can package flask with slim, slimPatternsAppendDefaults=false & slimPatterns options" {
+    cd tests/base
+    cat _slimPatterns.yml > slimPatterns.yml
+    npm i $(npm pack ../..)
+    sls --slim=true --slimPatternsAppendDefaults false package
+    unzip .serverless/sls-py-req-test.zip -d puck
+    ls puck/flask
+    test $(find puck -name "*.pyc" | wc -l) -ge 1
+    test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
+}
+
 @test "py3.6 doesn't package boto3 by default" {
     cd tests/base
     npm i $(npm pack ../..)
@@ -146,6 +157,19 @@ teardown() {
     test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
 }
 
+@test "py3.6 can package flask with slim & dockerizePip & slimPatterns & slimPatternsAppendDefaults=false  options" {
+    cd tests/base
+    cat _slimPatterns.yml > slimPatterns.yml
+    npm i $(npm pack ../..)
+    docker &> /dev/null || skip "docker not present"
+    ! uname -sm|grep Linux || groups|grep docker || id -u|egrep '^0$' || skip "can't dockerize on linux if not root & not in docker group"
+    sls --dockerizePip=true --slim=true --slimPatternsAppendDefaults false package
+    unzip .serverless/sls-py-req-test.zip -d puck
+    ls puck/flask
+    test $(find puck -name "*.pyc" | wc -l) -ge 1
+    test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
+}
+
 @test "py3.6 uses download cache with useDownloadCache option" {
     cd tests/base
     npm i $(npm pack ../..)
@@ -297,13 +321,24 @@ teardown() {
     cd tests/base
     cat _slimPatterns.yml > slimPatterns.yml
     npm i $(npm pack ../..)
-    sls --runtime=python2.7 --slim=true packag
+    sls --runtime=python2.7 --slim=true package
     unzip .serverless/sls-py-req-test.zip -d puck
     ls puck/flask
     test $(find puck -name "*.pyc" | wc -l) -eq 0
     test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
 }
 
+@test "py2.7 can package flask with slim & dockerizePip & slimPatterns & slimPatternsAppendDefaults=false  options" {
+    cd tests/base
+    cat _slimPatterns.yml > slimPatterns.yml
+    npm i $(npm pack ../..)
+    sls --runtime=python2.7 --slim=true --slimPatternsAppendDefaults false package
+    unzip .serverless/sls-py-req-test.zip -d puck
+    ls puck/flask
+    test $(find puck -name "*.pyc" | wc -l) -ge 1
+    test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
+}
+
 @test "py2.7 doesn't package boto3 by default" {
     cd tests/base
     npm i $(npm pack ../..)
@@ -375,6 +410,19 @@ teardown() {
     test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
 }
 
+@test "py2.7 can package flask with slim & dockerizePip & slimPatterns & slimPatternsAppendDefaults=false  options" {
+    cd tests/base
+    cat _slimPatterns.yml > slimPatterns.yml
+    npm i $(npm pack ../..)
+    docker &> /dev/null || skip "docker not present"
+    ! uname -sm|grep Linux || groups|grep docker || id -u|egrep '^0$' || skip "can't dockerize on linux if not root & not in docker group"
+    sls --dockerizePip=true --slim=true --slimPatternsAppendDefaults false --runtime=python2.7 package
+    unzip .serverless/sls-py-req-test.zip -d puck
+    ls puck/flask
+    test $(find puck -name "*.pyc" | wc -l) -ge 1
+    test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
+}
+
 @test "pipenv py3.6 can package flask with default options" {
     cd tests/pipenv
     npm i $(npm pack ../..)
@@ -403,6 +451,17 @@ teardown() {
     test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
 }
 
+@test "pipenv py3.6 can package flask with slim & slimPatterns & slimPatternsAppendDefaults false  option" {
+    cd tests/pipenv
+    npm i $(npm pack ../..)
+    cat _slimPatterns.yml > slimPatterns.yml
+    sls --slim=true --slimPatternsAppendDefaults false package
+    unzip .serverless/sls-py-req-test.zip -d puck
+    ls puck/flask
+    test $(find puck -name "*.pyc" | wc -l) -ge 1
+    test $(find puck -type d -name "*.egg-info*" | wc -l) -eq 0  
+}
+
 @test "pipenv py3.6 can package flask with zip option" {
     cd tests/pipenv
     npm i $(npm pack ../..)

tests/base/serverless.yml

@@ -12,11 +12,13 @@ custom:
     dockerizePip: ${opt:dockerizePip, self:custom.defaults.dockerizePip}
     slim: ${opt:slim, self:custom.defaults.slim}
     slimPatterns: ${file(./slimPatterns.yml):slimPatterns, self:custom.defaults.slimPatterns}
+    slimPatternsAppendDefaults: ${opt:slimPatternsAppendDefaults, self:custom.defaults.slimPatternsAppendDefaults}
     vendor: ${opt:vendor, ''}
     fileName: ${opt:fileName, 'requirements.txt'}
   defaults:
     slim: false
     slimPatterns: false
+    slimPatternsAppendDefaults: true
     zip: false
     dockerizePip: false
     individually: false