Class: WebGit::Diff

Inherits:
Object
  • Object
show all
Defined in:
lib/web_git/diff.rb

Class Method Summary collapse

Class Method Details

.diff_to_html(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 189

def self.diff_to_html(diff)
  left_hash = get_each_left(diff)
  right_hash = get_each_right(diff)
  html_output = '<div style="overflow-y: scroll;height:400px">'
  html_output += '<style>'
  html_output += Diffy::CSS
  html_output += '</style>'
  html_output += '<div class="row mb-3">'
  html_output += '<div class="col-md-12 offset" style="overflow-y: scroll;">'

  left_hash.keys.each do |file|
    html_output += '<div class="row text-center">
      <div class="col-12">
        <h4>'
    html_output+= file.to_s
    html_output += '</h4>
      </div>
    </div>
      <div class="row mb-4">
        <div class="col-6">'
    html_output += Diffy::SplitDiff.new(
      left_hash[file],
      right_hash[file],
      :format => :html
      ).left

    html_output +=
        '</div>
        <div class="col-6">'
    html_output += Diffy::SplitDiff.new(
      left_hash[file],
      right_hash[file],
      :format => :html
    ).right

    html_output += '</div></div>'
  end
  html_output += "</div>"
  html_output += "</div>"
  html_output += "</div>"
  html_output

end

.file_diffs(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 81

def self.file_diffs(diff)
  diff.scan(/diff --git.*?(?=diff --git|\z)/m)
end

.get_diff ⇒ Object 



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# File 'lib/web_git/diff.rb', line 3

def self.get_diff
  Dir.chdir(Rails.root) do
    `git diff`
  end
end

.get_each_left(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 9

def self.get_each_left(diff)
  filenames = get_file_names("")
  files = file_diffs(diff)
  lefts = {}
  files.each_with_index do |file, i|
    file_content = ""
    lines = file.split("\n").drop(4)
    start_line = 0
    current_line_index = 0
    line_number = start_line + current_line_index
    lines.each do |line|
      if !line.match?(/@@ ([-]\d+,\d+\s[+]\d+,\d+) @@/)
        if line.first != "+"
          file_content += "#{line_number}| " + line + "\n"
          line_number += 1
        end
      else
        current_line_index = 0
        # The line numbers in the output of a git diff match this regex
        numbers = line.scan(/@@ ([-]\d+,\d+\s[+]\d+,\d+) @@/).map(&:join)
        # If left, starting line number is the first one in a split Array
        start_line = numbers.first.split(" ").first.
          split(",").first.to_i.abs
        line_number = start_line + current_line_index
        file_content += "\n"
      end
    end
    lefts[filenames[i]] = file_content.chomp "\n"
  end
  lefts
end

.get_each_right(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 41

def self.get_each_right(diff)
  filenames = get_file_names("")
  files = file_diffs(diff)
  rights = {}
  files.each_with_index do |file, i|
    file_content = ""
    lines = file.split("\n").drop(4)
    start_line = 0
    current_line_index = 0
    line_number = start_line + current_line_index
    lines.each do |line|
      # The line numbers in the output of a git diff match this regex
      # @@ -61,18 +61,15 @@
      if !line.match?(/@@ ([-]\d+,\d+\s[+]\d+,\d+) @@/)
        if line.first != "-"
          file_content += "#{line_number}| " + line + "\n"
          line_number += 1
        end
      else
        current_line_index = 0
        numbers = line.scan(/@@ ([-]\d+,\d+\s[+]\d+,\d+) @@/).map(&:join)
        # If right, start line is the second in a split Array
        start_line = numbers.first.split(" ").second.
          split(",").first.to_i.abs
        line_number = start_line + current_line_index
        file_content += "\n"
      end
    end
    rights[filenames[i]] = file_content.chomp "\n"
  end
  rights
end

.get_file_names(commit) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 99

def self.get_file_names(commit)
  Dir.chdir(Rails.root) do
    if commit.blank?
      filenames = `git diff --name-only`
    else
      filenames = `git diff-tree --no-commit-id --name-only -r #{commit}`
    end
    filenames.split("\n")
  end
end

.get_last_commit_hash ⇒ Object 



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# File 'lib/web_git/diff.rb', line 74

def self.get_last_commit_hash
  Dir.chdir(Rails.root) do
    log = `git log -1 --oneline`
    log.split.first
  end
end

.get_last_diff ⇒ Object 



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# File 'lib/web_git/diff.rb', line 110

def self.get_last_diff
  Dir.chdir(Rails.root) do
    `git diff -M HEAD~1`
  end
end

.get_last_left(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 116

def self.get_last_left(diff)
  filenames = get_file_names(get_last_commit_hash)
  files = file_diffs(diff)
  ones = {}
  files.each_with_index do |file, i|
    file_content = ""
    lines = file.split("\n").drop(4)
    lines.each do |line|
      # The line numbers in the output of a git diff match this regex
      # @@ -61,18 +61,15 @@
      if !line.match?(/@@ ([-]\d+,\d+\s[+]\d+,\d+) @@/)
        if line.first != "+"
          line.slice!(0)
          file_content += line + "\n"
        end
      else
        file_content += "\n"
      end
    end
    ones[filenames[i]] = file_content.chomp "\n"
  end
  ones
end

.get_last_right(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 140

def self.get_last_right(diff)
  filenames = get_file_names(get_last_commit_hash)
  files = file_diffs(diff)
  ones = {}
  files.each_with_index do |file, i|
    file_content = ""
    lines = file.split("\n").drop(4)
    lines.each do |line|
      if !line.match?(/@@ ([-]\d+,\d+\s[+]\d+,\d+) @@/)
        if line.first != "+"
        elsif line.first == "+"
          line.slice!(0)
          file_content += line + "\n"
        end
      else
        file_content += "\n"
      end
    end
    ones[filenames[i]] = file_content.chomp "\n"
  end
  ones
end

.last_to_html(diff) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 163

def self.last_to_html(diff)
  left_hash = get_last_left(diff)
  right_hash = get_last_right(diff)

  html_output = '<link rel="stylesheet"' +
    'href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/' +
    'bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/' +
    '1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">'
  html_output += '<style>'
  html_output += Diffy::CSS
  html_output += '</style>'
  html_output += '<div class="card">'
  left_hash.keys.each do |file|
    html_output += '<div class="file mb-4 p-3">'
    html_output += '<h4>' + file + '</h4>'
    html_output += Diffy::Diff.new(
      left_hash[file],
      right_hash[file],
      :include_plus_and_minus_in_html => true
    ).to_s(:html)
    html_output += '</div>'
  end
  html_output += '</div>'
  html_output
end

.match_other_files(line, file, filenames) ⇒ Object 



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# File 'lib/web_git/diff.rb', line 85

def self.match_other_files(line, file, filenames)
  filenames.each do |other_file|
    if file != other_file
      # It looks like:
      #   --- a/<path-to-file>
      #   +++ b/<path-to-file>
      if line.include?('diff --git a/' + other_file + ' b/' + other_file)
        return true
      end
    end
  end
  false
end