Class: Fcom::Querier

Inherits:
Object
  • Object
show all
Includes:
OptionsHelpers, MemoWise
Defined in:
lib/fcom/querier.rb

Overview

This class executes a system command to retrieve the git history, which is passed through rg (ripgrep), and then ultimately is fed back to fcom for parsing.

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Querier

Returns a new instance of Querier.



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# File 'lib/fcom/querier.rb', line 14

def initialize(options)
  @options = options
end

Instance Method Details

#query ⇒ Object 



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# File 'lib/fcom/querier.rb', line 18

def query
  expression_to_match = search_string
  expression_to_match = Regexp.escape(expression_to_match).gsub('\\ ', ' ') unless regex_mode?

  if expression_to_match.nil? || expression_to_match.empty?
    puts('provide expression to match as first argument')
    exit
  end

  quote = expression_to_match.include?('"') ? "'" : '"'

  a_previous_command_generated_output_not_yet_spaced = false
  remaining_commits = commits

  filename_by_most_recent_containing_commit.each do |commit, path_at_commit|
    break if remaining_commits && remaining_commits <= 0

    command = query_command(commit, path_at_commit, expression_to_match, quote, remaining_commits)
    Fcom.logger.debug("Executing command: #{command}")

    commits_printed = 0
    PTY.spawn(command) do |stdout, _stdin, _pid|
      # Read first byte to detect any output
      first_byte = stdout.read(1)

      if first_byte
        # Add spacing if needed
        if a_previous_command_generated_output_not_yet_spaced
          print "\n\n"
        end

        a_previous_command_generated_output_not_yet_spaced = true

        print(first_byte)

        # Now read the rest line by line
        stdout.each_line do |line|
          puts(line)
          commits_printed += 1 if line.chomp == Fcom::Parser::COMMIT_HEADER_SEPARATOR
        end
      end
    rescue Errno::EIO
      # The command produced no output.
    end

    remaining_commits -= commits_printed if remaining_commits
  end
end