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require "grit"
module Gitlab
module Graph
class JsonBuilder
attr_accessor :days, :commits, :ref_cache, :repo
def self.max_count
@max_count ||= 650
end
def initialize project, ref
@project = project
@ref = ref
@repo = project.repo
@ref_cache = {}
@commits = collect_commits
@days = index_commits
@space = 0
end
def to_json(*args)
{
days: @days.compact.map { |d| [d.day, d.strftime("%b")] },
commits: @commits.map(&:to_graph_hash)
}.to_json(*args)
end
protected
# Get commits from repository
#
def collect_commits
@commits = Grit::Commit.find_all(repo, nil, {max_count: self.class.max_count}).dup
# Decorate with app/models/commit.rb
@commits.map! { |commit| ::Commit.new(commit) }
# Decorate with lib/gitlab/graph/commit.rb
@commits.map! { |commit| Gitlab::Graph::Commit.new(commit) }
# add refs to each commit
@commits.each { |commit| commit.add_refs(ref_cache, repo) }
@commits
end
# Method is adding time and space on the
# list of commits. As well as returns date list
# corelated with time set on commits.
#
# @param [Array<Graph::Commit>] comits to index
#
# @return [Array<TimeDate>] list of commit dates corelated with time on commits
def index_commits
days, heads = [], []
map = {}
commits.reverse.each_with_index do |c,i|
c.time = i
days[i] = c.committed_date
map[c.id] = c
heads += c.refs unless c.refs.nil?
end
heads.select!{|h| h.is_a? Grit::Head or h.is_a? Grit::Remote}
# sort heads so the master is top and current branches are closer
heads.sort! do |a,b|
if a.name == @ref
-1
elsif b.name == @ref
1
else
b.commit.committed_date <=> a.commit.committed_date
end
end
@_reserved = {}
days.each_index do |i|
@_reserved[i] = []
end
heads.each do |h|
if map.include? h.commit.id then
place_chain(map[h.commit.id], map)
end
end
days
end
# Add space mark on commit and its parents
#
# @param [Graph::Commit] the commit object.
# @param [Hash<String,Graph::Commit>] map of commits
def place_chain(commit, map, parent_time = nil)
leaves = take_left_leaves(commit, map)
if leaves.empty?
return
end
@space = find_free_space(leaves, map)
leaves.each{|l| l.space = @space}
# and mark it as reserved
min_time = leaves.last.time
parents = leaves.last.parents.collect
parents.each do |p|
if map.include? p.id
parent = map[p.id]
if parent.time < min_time
min_time = parent.time
end
end
end
if parent_time.nil?
max_time = leaves.first.time
else
max_time = parent_time - 1
end
mark_reserved(min_time..max_time, @space)
# Visit branching chains
leaves.each do |l|
parents = l.parents.collect.select{|p| map.include? p.id and map[p.id].space.zero?}
for p in parents
place_chain(map[p.id], map, l.time)
end
end
end
def mark_reserved(time_range, space)
for day in time_range
@_reserved[day].push(space)
end
end
def find_free_space(leaves, map)
time_range = leaves.last.time..leaves.first.time
reserved = []
for day in time_range
reserved += @_reserved[day]
end
space = base_space(leaves, map)
while (reserved.include? space) || (space == @space) do
space += 1
end
space
end
def base_space(leaves, map)
parents = []
leaves.each do |l|
parents.concat l.parents.collect.select{|p| map.include? p.id and map[p.id].space.nonzero?}
end
space = parents.map{|p| map[p.id].space}.max || 0
space += 1
end
# Takes most left subtree branch of commits
# which don't have space mark yet.
#
# @param [Graph::Commit] the commit object.
# @param [Hash<String,Graph::Commit>] map of commits
#
# @return [Array<Graph::Commit>] list of branch commits
def take_left_leaves(commit, map)
leaves = []
leaves.push(commit) if commit.space.zero?
while true
return leaves if commit.parents.count.zero?
return leaves unless map.include? commit.parents.first.id
commit = map[commit.parents.first.id]
return leaves unless commit.space.zero?
leaves.push(commit)
end
end
end
end
end
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