gitlabhq/app/models/graph/json_builder.rb

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require "grit"
module Graph
class JsonBuilder
attr_accessor :days, :commits, :ref_cache, :repo
def self.max_count
@max_count ||= 650
end
def initialize project, ref, commit
@project = project
@ref = ref
@commit = commit
@repo = project.repo
@ref_cache = {}
@commits = collect_commits
@days = index_commits
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, {date_order: true, max_count: self.class.max_count, skip: to_commit}).dup
# Decorate with app/models/commit.rb
@commits.map! { |commit| Commit.new(commit) }
# Decorate with lib/gitlab/graph/commit.rb
@commits.map! { |commit| 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>] commits to index
#
# @return [Array<TimeDate>] list of commit dates corelated with time on commits
def index_commits
days, times = [], []
map = {}
commits.reverse.each_with_index do |c,i|
c.time = i
days[i] = c.committed_date
map[c.id] = c
times[i] = c
end
@_reserved = {}
days.each_index do |i|
@_reserved[i] = []
end
commits_sort_by_ref.each do |commit|
if map.include? commit.id then
place_chain(map[commit.id], map)
end
end
# find parent spaces for not overlap lines
times.each do |c|
c.parent_spaces.concat(find_free_parent_spaces(c, map, times))
end
days
end
# Skip count that the target commit is displayed in center.
def to_commit
commits = Grit::Commit.find_all(repo, nil, {date_order: true})
commit_index = commits.index do |c|
c.id == @commit.id
end
if commit_index && (self.class.max_count / 2 < commit_index) then
# get max index that commit is displayed in the center.
commit_index - self.class.max_count / 2
else
0
end
end
def commits_sort_by_ref
commits.sort do |a,b|
if include_ref?(a)
-1
elsif include_ref?(b)
1
else
b.committed_date <=> a.committed_date
end
end
end
def include_ref?(commit)
heads = commit.refs.select do |ref|
ref.is_a?(Grit::Head) or ref.is_a?(Grit::Remote) or ref.is_a?(Grit::Tag)
end
heads.map! do |head|
head.name
end
heads.include?(@ref)
end
def find_free_parent_spaces(commit, map, times)
spaces = []
commit.parents.each do |p|
if map.include?(p.id) then
parent = map[p.id]
range = if commit.time < parent.time then
commit.time..parent.time
else
parent.time..commit.time
end
space = if commit.space >= parent.space then
find_free_parent_space(range, parent.space, -1, commit.space, times)
else
find_free_parent_space(range, commit.space, -1, parent.space, times)
end
mark_reserved(range, space)
spaces << space
end
end
spaces
end
def find_free_parent_space(range, space_base, space_step, space_default, times)
if is_overlap?(range, times, space_default) then
find_free_space(range, space_step, space_base, space_default)
else
space_default
end
end
def is_overlap?(range, times, overlap_space)
range.each do |i|
if i != range.first &&
i != range.last &&
times[i].spaces.include?(overlap_space) then
return true;
end
end
false
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
time_range = leaves.last.time..leaves.first.time
space_base = get_space_base(leaves, map)
space = find_free_space(time_range, 2, space_base)
leaves.each do |l|
l.spaces << space
# Also add space to parent
l.parents.each do |p|
if map.include?(p.id)
parent = map[p.id]
if parent.space > 0
parent.spaces << space
end
end
end
end
# 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 get_space_base(leaves, map)
space_base = 1
if leaves.last.parents.size > 0
first_parent = leaves.last.parents.first
if map.include?(first_parent.id)
first_p = map[first_parent.id]
if first_p.space > 0
space_base = first_p.space
end
end
end
space_base
end
def mark_reserved(time_range, space)
for day in time_range
@_reserved[day].push(space)
end
end
def find_free_space(time_range, space_step, space_base = 1, space_default = nil)
space_default ||= space_base
reserved = []
for day in time_range
reserved += @_reserved[day]
end
reserved.uniq!
space = space_default
while reserved.include?(space) do
space += space_step
if space < space_base then
space_step *= -1
space = space_base + space_step
end
end
space
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