allow to use precommit closure in commitChanges (kiegroup#115)

* allow to use precommit closure in `commitChanges`

* review update

* update after review comment

test/vars/GithubScmSpec.groovy

@@ -249,6 +249,24 @@ class GithubScmSpec extends JenkinsPipelineSpecification {
         1 * getPipelineMock("sh")("git commit -m 'commit message'")
     }
 
+    def "[githubscm.groovy] commitChanges with precommit closure"() {
+        when:
+        groovyScript.commitChanges('commit message', {
+            sh 'whatever'
+        })
+        then:
+        1 * getPipelineMock("sh")('whatever')
+        1 * getPipelineMock("sh")("git commit -m 'commit message'")
+    }
+
+    def "[githubscm.groovy] commitChanges without precommit closure"() {
+        when:
+        groovyScript.commitChanges('commit message')
+        then:
+        1 * getPipelineMock("sh")("git commit -m 'commit message'")
+    }
+
+
     def "[githubscm.groovy] forkRepo without credentials"() {
         setup:
         groovyScript.getBinding().setVariable("GITHUB_USER", 'user')

vars/githubscm.groovy

@@ -93,11 +93,15 @@ def createBranch(String branchName) {
     println "[INFO] Created branch '${branchName}' on repo."
 }
 
-def commitChanges(String commitMessage, String filesToAdd = '--all') {
-    sh "git add ${filesToAdd}"
+def commitChanges(String commitMessage, Closure preCommit) {
+    preCommit()
     sh "git commit -m '${commitMessage}'"
 }
 
+def commitChanges(String commitMessage, String filesToAdd = '--all') {
+    commitChanges(commitMessage, { sh "git add ${filesToAdd}" })
+}
+
 def forkRepo(String credentialID = 'kie-ci') {
     cleanHubAuth()
     withCredentials([usernamePassword(credentialsId: credentialID, usernameVariable: 'GITHUB_USER', passwordVariable: 'GITHUB_TOKEN')]) {
@@ -243,3 +247,22 @@ def getForkedProjectName(String group, String repository, String owner, String c
 def cleanHubAuth() {
     sh "rm -rf ~/.config/hub"
 }
+
+/**
+* Uses `find` command to stage all files matching the pattern and which are not in .gitignore 
+*/
+def findAndStageNotIgnoredFiles(String findNamePattern){
+    // based on https://stackoverflow.com/a/59888964/8811872
+    sh """
+    find . -type f -name '${findNamePattern}' > found_files.txt
+    files_to_add=""
+    while IFS= read -r file; do
+        if ! git check-ignore -q "\$file"; then
+            files_to_add="\$files_to_add \$file"
+        fi
+    done < found_files.txt
+    rm found_files.txt
+    git add \$files_to_add
+    git status
+    """
+}