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PBGitRevList.mm
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PBGitRevList.mm
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//
// PBGitRevList.m
// GitX
//
// Created by Pieter de Bie on 17-06-08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import "PBGitRevList.h"
#import "PBGitGrapher.h"
#import "PBRevPoolDelegate.h"
#import "PBGitRepository.h"
#import "PBGitCommit.h"
#import "PBGitRevSpecifier.h"
#import "PBGitRevPool.h"
#import "PBGitRepository.h"
#include "git/oid.h"
#include <ext/stdio_filebuf.h>
#include <iostream>
#include <string>
#include <list>
using namespace std;
static void linearizeCommits(PBGitRevPool *pool, NSArray **commits, PBGitRepository *repository);
@implementation PBGitRevList
@synthesize commits;
- initWithRepository:(PBGitRepository *)repo
{
repository = repo;
[repository addObserver:self forKeyPath:@"currentBranch" options:0 context:nil];
return self;
}
- (void) reload
{
[self readCommitsForce: YES];
}
- (void) readCommitsForce: (BOOL) force
{
// We use refparse to get the commit sha that we will parse. That way,
// we can check if the current branch is the same as the previous one
// and in that case we don't have to reload the revision list.
// If no branch is selected, don't do anything
if (![repository currentBranch])
return;
PBGitRevSpecifier* newRev = [repository currentBranch];
NSString* newSha = nil;
if (!force && newRev && [newRev isSimpleRef]) {
newSha = [repository parseReference:[newRev simpleRef]];
if ([newSha isEqualToString:lastSha])
return;
}
lastSha = newSha;
NSThread * commitThread = [[NSThread alloc] initWithTarget: self selector: @selector(walkRevisionListWithSpecifier:) object:newRev];
[commitThread start];
}
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
change:(NSDictionary *)change context:(void *)context
{
if (object == repository)
[self readCommitsForce: NO];
}
- (void) walkRevisionListWithSpecifier:(PBGitRevSpecifier *)rev
{
commits = [NSMutableArray array];
PBGitRevPool *pool = [[PBGitRevPool alloc] initWithRepository:repository];
repository.commitPool = pool;
pool.delegate = self;
[pool loadRevisions:rev];
commitsLoaded = 0;
[self linearizeCommits];
size_t i;
for (i = 0; i < 100; ++i) {
grapher = [[PBGitGrapher alloc] initWithRepository:repository];
for (PBGitCommit *commit in commits)
[grapher decorateCommit:commit];
}
[self performSelectorOnMainThread:@selector(setCommits:) withObject:commits waitUntilDone:YES];
}
- (void)revPool:(PBGitRevPool *)pool encounteredCommit:(PBGitCommit *)commit
{
[commits addObject: commit];
// if (++commitsLoaded % 1000 == 0)
// [self linearizeCommits];
}
-(void) linearizeCommits
{
NSDate *start = [NSDate date];
//bool tipChanged = false;
/* Mark them and clear the indegree */
for (PBGitCommit *commit in commits)
commit->inDegree = 1;
/* update the indegree */
for (PBGitCommit *commit in commits)
{
for (PBGitCommit *parent in [commit parents]) {
if (parent->inDegree)
parent->inDegree++;
}
}
/*
* find the tips
*
* tips are nodes not reachable from any other node in the list
*
* the tips serve as a starting set for the work queue.
*/
std::list<PBGitCommit *> tips;
for (PBGitCommit *commit in commits)
{
if (commit->inDegree == 1)
tips.push_back(commit);
}
NSMutableArray *sortedCommits = [NSMutableArray array];
// int i = 0;
while (tips.size())
{
PBGitCommit *commit = tips.front();
tips.pop_front();
for (PBGitCommit *parent in [commit parents]) {
if (!parent->inDegree)
continue;
/*
* parents are only enqueued for emission
* when all their children have been emitted thereby
* guaranteeing topological order.
*/
if (--parent->inDegree == 1)
tips.push_front(parent);
}
/*
* current item is a commit all of whose children
* have already been emitted. we can emit it now.
*/
// if (tipChanged || [*commits objectAtIndex: i++] != commit)
// {
// tipChanged = true;
// [grapher decorateCommit: commit];
// }
[sortedCommits addObject:commit];
}
commits = sortedCommits;
NSTimeInterval duration = [[NSDate date] timeIntervalSinceDate:start];
NSLog(@"Sorted %i commits in %f seconds", [commits count], duration);
}
@end