Merge pull request #7 from boost/automate-baseline

feat: set up automated baseline generation

Author: lunmanlee

README.md

@@ -120,15 +120,12 @@ It runs the https://hub.docker.com/r/codeclimate/codeclimate docker image under
         $ bundle binstubs codeclimate_diff
 
 
-6. Run the baseline and commit the result to the repo
+    Add codeclimate_diff_baseline.json to .gitignore
 
-    ```
-    ./bin/codeclimate_diff --baseline
-    ```
 
 ## Usage
 
-1. Create a feature branch for your work, and reset the baseline + commit (5 mins)
+1. Create a feature branch for your work
 
 2. Do some work
 
@@ -137,7 +134,7 @@ It runs the https://hub.docker.com/r/codeclimate/codeclimate docker image under
     ```bash
     # runs on each file changed in your branch (about 10 secs per code file changed on your branch)
     ./bin/codeclimate_diff
-
+    # baseline is now generated on first run, to generate new baseline, delete the existing.
     OR
 
     # filters the changed files in your branch futher by a grep pattern

exe/codeclimate_diff

@@ -23,10 +23,10 @@ OptionParser.new do |opts|
           "Grep pattern to filter files.  If provided, will filter the files changed on your branch further.")
 end.parse!(into: options)
 
-if options[:baseline]
-  CodeclimateDiff::Runner.generate_baseline
-elsif options[:"new-only"]
-  CodeclimateDiff::Runner.run_diff_on_branch(options[:pattern], always_analyze_all_files: options[:all], show_preexisting: false)
+if options[:"new-only"]
+  CodeclimateDiff::Runner.run_diff_on_branch(options[:pattern], always_analyze_all_files: options[:all],
+                                                                show_preexisting: false)
 else
-  CodeclimateDiff::Runner.run_diff_on_branch(options[:pattern], always_analyze_all_files: options[:all], show_preexisting: true)
+  CodeclimateDiff::Runner.run_diff_on_branch(options[:pattern], always_analyze_all_files: options[:all],
+                                                                show_preexisting: true)
 end

lib/codeclimate_diff/runner.rb

@@ -86,8 +86,27 @@ def self.generate_baseline
       puts "Done!"
     end
 
+    def self.setup_baseline_for_branch
+      main_branch = CodeclimateDiff.configuration["main_branch_name"] || "main"
+
+      project_repo = `basename $(pwd)`.strip
+
+      puts "Creating a temp worktree to generate the baseline..."
+      system("git worktree add ../temp-codeclimate #{main_branch}")
+
+      Dir.chdir("../temp-codeclimate") do
+        generate_baseline
+
+        puts "Copying the baseline to #{project_repo}..."
+        system("cp codeclimate_diff_baseline.json ../#{project_repo}")
+      end
+
+      puts("Removing the temp worktree...")
+      system("git worktree remove ../temp-codeclimate")
+    end
+
     def self.run_diff_on_branch(pattern, always_analyze_all_files: false, show_preexisting: true)
-      CodeclimateWrapper.new.pull_latest_image
+      setup_baseline_for_branch unless File.exist?("codeclimate_diff_baseline.json")
 
       changed_filenames = calculate_changed_filenames(pattern)