dweiss commented on a change in pull request #73:
URL: https://github.com/apache/lucene/pull/73#discussion_r609808709
##########
File path: help/regeneration.txt
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@@ -0,0 +1,23 @@
+Regeneration
+============
+
+Lucene makes use of some generated code (e.g. jflex tokenizers).
+
+Examples below assume cwd at the gradlew script in the top directory of
+the project's checkout.
+
+
+Generic regeneration commands
+------------------------------
+
+Regenerate code:
+
+gradlew regenerate tidy
+
+Force-regenerate code, even when it isn't necessary:
+
+gradlew --rerun-tasks regenerate tidy
+
+Force-regenerate code, except for one tokenizer which is extremely slow:
Review comment:
An example of when --rerun-tasks is useful is when you tweak the code of
the generation task itself (not the inputs/outputs but the task itself).
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