Module: AIGit::Ollama

Defined in:
lib/ai_git/ollama.rb

Class Method Summary collapse

Class Method Details

.escape_json(string) ⇒ Object 



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# File 'lib/ai_git/ollama.rb', line 9

def escape_json(string)
  string.gsub('\\', '\\\\')
    .gsub('"', '\"')
    .gsub("\n", '\\n')
    .gsub("\r", '\\r')
    .gsub("\t", '\\t')
end

.generate_commit_message(diff) ⇒ Object 



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# File 'lib/ai_git/ollama.rb', line 17

def generate_commit_message(diff)
  raise 'No staged changes to generate commit message for' if diff.to_s.strip.empty?

  prompt = <<~PROMPT
You are an expert Git commit message writer. Your only job is to output a commit message — nothing else.

Here are the changes:
#{diff}

Rules you MUST follow exactly:
- Output ONLY the commit message. No explanations, no quotes, no markdown, no "Here is the commit message", no backticks.
- Use this exact structure:
  1. First line: Conventional commit type + short imperative title (max 72 chars, ideally < 50)
  2. Second line: blank
  3. Body (optional but recommended): Clear, concise explanation of WHAT changed and WHY.

Examples of good output:
feat: add user authentication flow

Implemented JWT-based login with refresh tokens. Added protected routes middleware.

fix: prevent null pointer on missing metadata

Added nil check in ReportGenerator#process before accessing user preferences.

Now generate the commit message:
  PROMPT

  json_body = {
    # model: 'qwen:14b',
    model: 'ministral-3:8b',
    prompt: prompt,
    stream: false,
    # These parameters help a lot with strictness:
    temperature: 0.3,
    top_p: 0.9,
    stop: ["\n\n\n", "```", "Here is", "The commit message"],
    num_predict: 400   # Limit output length
  }.to_json

  uri = URI('http://localhost:11434/api/generate')
  request = Net::HTTP::Post.new(uri)
  request['Content-Type'] = 'application/json'
  request.body = json_body

  response = Net::HTTP.start(uri.host, uri.port, read_timeout: 120) do |http|
    http.request(request)
  end

  raise 'Failed to connect to Ollama. Is it running?' unless response.is_a?(Net::HTTPSuccess)

  data = JSON.parse(response.body)
  message = data['response'].to_s.strip

  # Aggressive cleaning
  message = message.gsub(/^(Here is|The commit message is|```|json|markdown)/i, '')
    .gsub(/^>\s*/, '')
    .gsub(/\\n/, "\n")
    .strip

  # Remove common unwanted prefixes/suffixes
  lines = message.lines.map(&:strip)
  lines.reject! { |line| line.match?(/^(Here|Output|Generated|Based on|The changes)/i) }

  message = lines.join("\n").strip

  # Ensure it has at least a title
  if message.lines.count < 1 || message.strip.empty?
    message = "chore: update code"  # fallback
  end

  message
end