PBGitBinary.m

   1 //
   2 //  PBGitBinary.m
   3 //  GitX
   4 //
   5 //  Created by Pieter de Bie on 04-10-08.
   6 //  Copyright 2008 __MyCompanyName__. All rights reserved.
   7 //
   8
   9 #import "PBGitBinary.h"
  10 #import "PBEasyPipe.h"
  11
  12 @implementation PBGitBinary
  13
  14 static NSString* gitPath = nil;
  15
  16 + (NSString *)versionForPath:(NSString *)path
  17 {
  18         if (!path)
  19                 return nil;
  20
  21         if (![[NSFileManager defaultManager] fileExistsAtPath:path])
  22                 return nil;
  23
  24         NSString *version = [PBEasyPipe outputForCommand:path withArgs:[NSArray arrayWithObject:@"--version"]];
  25         if ([version hasPrefix:@"git version "])
  26                 return [version substringFromIndex:12];
  27
  28         return nil;
  29 }
  30
  31 + (BOOL) acceptBinary:(NSString *)path
  32 {
  33         if (!path)
  34                 return NO;
  35
  36         NSString *version = [self versionForPath:path];
  37         if (!version)
  38                 return NO;
  39
  40         int c = [version compare:@"" MIN_GIT_VERSION];
  41         if (c == NSOrderedSame || c == NSOrderedDescending) {
  42                 gitPath = path;
  43                 return YES;
  44         }
  45
  46         NSLog(@"Found a git binary at %@, but is only version %@", path, version);
  47         return NO;
  48 }
  49
  50 + (void) initialize
  51 {
  52         // Check what we might have in user defaults
  53         // NOTE: Currently this should NOT have a registered default, or the searching bits below won't work
  54         gitPath = [[NSUserDefaults standardUserDefaults] stringForKey:@"gitExecutable"];
  55         if (gitPath.length > 0) {
  56                 if ([self acceptBinary:gitPath])
  57                         return;
  58                 [[NSAlert alertWithMessageText:@"Invalid git path"
  59                                                 defaultButton:@"OK"
  60                                           alternateButton:nil
  61                                                   otherButton:nil
  62                         informativeTextWithFormat:@"You entered a custom git path in the Preferences pane, "
  63                  "but this path is not a valid git v" MIN_GIT_VERSION " or higher binary. We're going to use the default "
  64                  "search paths instead"] runModal];
  65         }
  66
  67         // Try to find the path of the Git binary
  68         char* path = getenv("GIT_PATH");
  69         if (path && [self acceptBinary:[NSString stringWithUTF8String:path]])
  70                 return;
  71
  72         // No explicit path. Try it with "which"
  73         NSString *whichPath = [PBEasyPipe outputForCommand:@"/usr/bin/which" withArgs:[NSArray arrayWithObject:@"git"]];
  74         if ([self acceptBinary:whichPath])
  75                 return;
  76
  77         // Still no path. Let's try some default locations.
  78         for (NSString* location in [PBGitBinary searchLocations]) {
  79                 if ([self acceptBinary:location])
  80                         return;
  81         }
  82
  83         NSLog(@"Could not find a git binary higher than version " MIN_GIT_VERSION);
  84 }
  85
  86 + (NSString *) path;
  87 {
  88         return gitPath;
  89 }
  90
  91 static NSMutableArray *locations = nil;
  92
  93 + (NSArray *) searchLocations
  94 {
  95         if (locations)
  96                 return locations;
  97
  98         locations = [NSMutableArray arrayWithObjects:@"/opt/local/bin/git",
  99                                                   @"/sw/bin/git",
 100                                                   @"/opt/git/bin/git",
 101                                                   @"/usr/local/bin/git",
 102                                                   @"/usr/local/git/bin/git",
 103                                                   nil];
 104
 105         [locations addObject:[@"~/bin/git" stringByExpandingTildeInPath]];
 106         return locations;
 107 }
 108
 109 + (NSString *) notFoundError
 110 {
 111         NSMutableString *error = [NSMutableString stringWithString:
 112                                                           @"Could not find a git binary version " MIN_GIT_VERSION " or higher.\n"
 113                                                           "Please make sure there is a git binary in one of the following locations:\n\n"];
 114         for (NSString *location in [PBGitBinary searchLocations]) {
 115                 [error appendFormat:@"\t%@\n", location];
 116         }
 117         return error;
 118 }
 119
 120
 121 + (NSString *)version
 122 {
 123         return [self versionForPath:gitPath];
 124 }
 125
 126
 127 @end