Passing path to shell scripts as argument, created README.md

splitting/README.md

@@ -0,0 +1,15 @@
+# Repository Splitting
+
+This project provides tools for splitting the Xtext repository as described [in the Wiki](https://github.com/eclipse/xtext/wiki/Restructuring). This is the proposed work flow:
+
+ 1. `../gradlew findProjects` creates `build/splitting/all-projects.txt`, a list of all projects (paths with a `.project` file) that have ever been in the history, and `build/splitting/unmapped-paths.txt`, a list of paths that are not covered by any project.
+ 2. Create `splitting.txt` based on the results of the previous step. This file must consist of lines of the form `path >> target-repos`, where `path` can be any file or directory in the repository and `target-repos` is either `delete` or a list of repository ids where that path should be included.
+ 3. `../gradlew clean validateSplitting` checks whether `splitting.txt` covers all files found in the history.
+ 4. `../gradlew generateRemovals` creates `build/splitting/removals-*.txt` for each target repository.
+
+Now you have all necessary data to perform the actual splitting. In order to do this:
+
+ 1. Create and checkout a new branch.
+ 2. Run `../gradlew *FilterBranch`, where `*` is the target repository id.
+ 3. Find something else to do (on my machine the previous command takes more than one hour).
+ 4. Push the resulting branch to the corresponding repository.

splitting/build.gradle

@@ -61,6 +61,6 @@ repositories.each { targetRepo ->
 		dependsOn(generateRemovals)
 		inputs.file removalsFile
 		workingDir '..'
-		commandLine 'splitting/git-filter-branch.sh', removalsFile.path
+		commandLine 'splitting/git-filter-branch.sh', removalsFile.path, file('.').canonicalPath
 	}
 }

splitting/git-filter-branch.sh

@@ -3,5 +3,5 @@
 REMOVALS=`cat $1 | tr '\n' ' '`
 git filter-branch -f --prune-empty \
     --index-filter "git rm -qrf --cached --ignore-unmatch $REMOVALS" \
-    --parent-filter splitting/parent-filter.sh \
+    --parent-filter $2/parent-filter.sh \
     HEAD

splitting/src/org/eclipse/xtext/splitting/ValidateSplitting.java

@@ -39,17 +39,16 @@ public class ValidateSplitting {
 				while ((line = reader.readLine()) != null) {
 					if (!line.isEmpty()) {
 						String[] parts = line.split(">>");
-						if (parts.length != 2) {
+						if (parts.length != 2)
 							fail("Invalid line: " + line);
-						}
-						String[] repos = parts[1].split(",");
-						if (repos.length == 0) {
-							fail("Invalid line: " + line);
-						}
-						for (String repo : repos) {
-							String trimmed = repo.trim();
-							if (!(REPOSITORIES.contains(trimmed) || DELETE.equals(trimmed))) {
-								fail("Invalid repository: " + trimmed);
+						if (!DELETE.equals(parts[1].trim())) {
+							String[] repos = parts[1].split(",");
+							if (repos.length == 0)
+								fail("Invalid line: " + line);
+							for (String repo : repos) {
+								String trimmed = repo.trim();
+								if (!REPOSITORIES.contains(trimmed))
+									fail("Invalid repository: " + trimmed);
 							}
 						}
 						String path = parts[0].trim();
@@ -74,9 +73,8 @@ public class ValidateSplitting {
 								if (specifiedPaths.contains(file.substring(0, lastMatch)))
 									foundSplitting = true;
 							}
-							if (!foundSplitting) {
+							if (!foundSplitting)
 								fail("File not covered by splitting: " + file);
-							}
 						}
 					}
 				}