gitlabhq/app/models/network/graph.rb
2013-03-19 10:00:29 +09:00

281 lines
6.4 KiB
Ruby

require "grit"
module Network
class Graph
attr_reader :days, :commits, :map
def self.max_count
@max_count ||= 650
end
def initialize project, ref, commit
@project = project
@ref = ref
@commit = commit
@repo = project.repo
@commits = collect_commits
@days = index_commits
end
protected
# Get commits from repository
#
def collect_commits
refs_cache = build_refs_cache
find_commits(count_to_display_commit_in_center)
.map do |commit|
# Decorate with app/model/network/commit.rb
Network::Commit.new(commit, refs_cache[commit.id])
end
end
# Method is adding time and space on the
# list of commits. As well as returns date list
# corelated with time set on commits.
#
# @return [Array<TimeDate>] list of commit dates corelated with time on commits
def index_commits
days = []
@map = {}
@commits.reverse.each_with_index do |c,i|
c.time = i
days[i] = c.committed_date
@map[c.id] = c
end
@reserved = {}
days.each_index do |i|
@reserved[i] = []
end
commits_sort_by_ref.each do |commit|
place_chain(commit)
end
# find parent spaces for not overlap lines
@commits.each do |c|
c.parent_spaces.concat(find_free_parent_spaces(c))
end
days
end
# Skip count that the target commit is displayed in center.
def count_to_display_commit_in_center
commit_index = find_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 find_commits(skip = 0)
Grit::Commit.find_all(
@repo,
nil,
{
date_order: true,
max_count: self.class.max_count,
skip: skip
}
)
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)
spaces = []
commit.parents(@map).each do |parent|
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)
else
find_free_parent_space(range, commit.space, -1, parent.space)
end
mark_reserved(range, space)
spaces << space
end
spaces
end
def find_free_parent_space(range, space_base, space_step, space_default)
if is_overlap?(range, space_default) then
find_free_space(range, space_step, space_base, space_default)
else
space_default
end
end
def is_overlap?(range, overlap_space)
range.each do |i|
if i != range.first &&
i != range.last &&
@commits[reversed_index(i)].spaces.include?(overlap_space) then
return true;
end
end
false
end
# Add space mark on commit and its parents
#
# @param [::Commit] the commit object.
def place_chain(commit, parent_time = nil)
leaves = take_left_leaves(commit)
if leaves.empty?
return
end
time_range = leaves.last.time..leaves.first.time
space_base = get_space_base(leaves)
space = find_free_space(time_range, 2, space_base)
leaves.each do |l|
l.spaces << space
# Also add space to parent
l.parents(@map).each do |parent|
if parent.space > 0
parent.spaces << space
end
end
end
# and mark it as reserved
min_time = leaves.last.time
leaves.last.parents(@map).each do |parent|
if parent.time < min_time
min_time = parent.time
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(@map).select{|p| p.space.zero?}
for p in parents
place_chain(p, l.time)
end
end
end
def get_space_base(leaves)
space_base = 1
parents = leaves.last.parents(@map)
if parents.size > 0
if parents.first.space > 0
space_base = parents.first.space
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 [::Commit] the commit object.
#
# @return [Array<Network::Commit>] list of branch commits
def take_left_leaves(raw_commit)
commit = @map[raw_commit.id]
leaves = []
leaves.push(commit) if commit.space.zero?
while true
return leaves if commit.parents(@map).count.zero?
commit = commit.parents(@map).first
return leaves unless commit.space.zero?
leaves.push(commit)
end
end
def build_refs_cache
refs_cache = {}
@repo.refs.each do |ref|
refs_cache[ref.commit.id] = [] unless refs_cache.include?(ref.commit.id)
refs_cache[ref.commit.id] << ref
end
refs_cache
end
def reversed_index(index)
-index - 1
end
end
end