Add full option for blob diff action

Returns all diff lines for frontend if full is true.
Turn UnfoldForm into presenter, and move controller logic to presenter.

1 files changed, 44 insertions, 0 deletions

diff --git a/app/presenters/blobs/unfold_presenter.rb b/app/presenters/blobs/unfold_presenter.rb
new file mode 100644
index 00000000000..908b2f97f89
--- /dev/null
+++ b/app/presenters/blobs/unfold_presenter.rb
@@ -0,0 +1,44 @@
+# frozen_string_literal: true
+
+require 'gt_one_coercion'
+
+module Blobs
+  class UnfoldPresenter < BlobPresenter
+    include Virtus.model
+    include Gitlab::Utils::StrongMemoize
+
+    attribute :full, Boolean, default: false
+    attribute :since, GtOneCoercion
+    attribute :to, GtOneCoercion
+    attribute :bottom, Boolean
+    attribute :unfold, Boolean, default: true
+    attribute :offset, Integer
+    attribute :indent, Integer, default: 0
+
+    def initialize(blob, params)
+      @subject = blob
+      @all_lines = highlight.lines
+      super(params)
+
+      if full?
+        self.attributes = { since: 1, to: @all_lines.size, bottom: false, unfold: false, offset: 0, indent: 0 }
+      end
+    end
+
+    def lines
+      strong_memoize(:lines) do
+        lines = @all_lines
+        lines = lines[since - 1..to - 1] unless full?
+        lines.map(&:html_safe)
+      end
+    end
+
+    def match_line_text
+      return '' if bottom?
+
+      lines_length = lines.length - 1
+      line = [since, lines_length].join(',')
+      "@@ -#{line}+#{line} @@"
+    end
+  end
+end