tools/osx/xcode_locator.m - bazel - Git at Google

 // Copyright 2015 Google Inc. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //    http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 // Application that finds all Xcodes installed on a given Mac and will return a
 // path for a given version number.
 //
 // If you have 7.0, 6.4.1 and 6.3 installed the inputs will map to:
 //
 // 7,7.0,7.0.0 = 7.0
 // 6,6.4,6.4.1 = 6.4.1
 // 6.3,6.3.0 = 6.3

 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif

 #import <CoreServices/CoreServices.h>
 #import <Foundation/Foundation.h>

 // Simple data structure for tracking a version of Xcode (i.e. 6.4) with an URL
 // to the appplication.
 @interface XcodeVersionEntry : NSObject
 @property(readonly) NSString *version;
 @property(readonly) NSURL *url;
 @end

 @implementation XcodeVersionEntry

 - (id)initWithVersion:(NSString *)version url:(NSURL *)url {
   if ((self = [super init])) {
     _version = version;
     _url = url;
   }
   return self;
 }

 - (id)description {
   return [NSString stringWithFormat:@"<%@ %p>: %@ %@",
                    [self class], self, _version, _url];
 }

 @end

 // Given an entry, insert it into a dictionary that is keyed by versions.
 //
 // For an entry that is 6.4.1:/Applications/Xcode.app, add it for 6.4.1 and
 // optionally add it for 6.4 and 6 if it is "better" than any entry that may
 // already be there, where "better" is defined as:
 //
 // 1. Under /Applications/. (This avoids mounted xcode versions taking
 //    precedence over installed versions.)
 //
 // 2. Not older (at least as high version number).
 static void AddEntryToDictionary(
   XcodeVersionEntry *entry,
   NSMutableDictionary<NSString *, XcodeVersionEntry *> *dict) {
   BOOL inApplications =
       [entry.url.path rangeOfString:@"/Applications/"].location != NSNotFound;
   NSString *entryVersion = entry.version;
   NSString *subversion = entryVersion;
   if (dict[entryVersion] && !inApplications) {
     return;
   }
   dict[entryVersion] = entry;
   while (YES) {
     NSRange range = [subversion rangeOfString:@"." options:NSBackwardsSearch];
     if (range.length == 0 || range.location == 0) {
       break;
     }
     subversion = [subversion substringToIndex:range.location];
     XcodeVersionEntry *subversionEntry = dict[subversion];
     if (subversionEntry) {
       BOOL atLeastAsLarge = ([subversionEntry.version compare:entry.version]
                              == NSOrderedDescending);
       if (inApplications && atLeastAsLarge) {
         dict[subversion] = entry;
       }
     } else {
       dict[subversion] = entry;
     }
   }
 }

 // Given a "version", expand it to at least 3 components by adding .0 as
 // necessary.
 static NSString *ExpandVersion(NSString *version) {
   NSArray *components = [version componentsSeparatedByString:@"."];
   NSString *appendage = nil;
   if (components.count == 2) {
     appendage = @".0";
   } else if (components.count == 1) {
     appendage = @".0.0";
   }
   if (appendage) {
     version = [version stringByAppendingString:appendage];
   }
   return version;
 }

 // Searches for all available Xcodes in the system and returns a dictionary that
 // maps version identifiers of any form (X, X.Y, and X.Y.Z) to the directory
 // where the Xcode bundle lives.
 //
 // If there is a problem locating the Xcodes, prints one or more error messages
 // and returns nil.
 static NSMutableDictionary<NSString *, XcodeVersionEntry *> *FindXcodes()
   __attribute((ns_returns_retained)) {
   CFStringRef bundleID = CFSTR("com.apple.dt.Xcode");

   NSMutableDictionary<NSString *, XcodeVersionEntry *> *dict =
       [[NSMutableDictionary alloc] init];
   CFErrorRef cfError;
   NSArray *array = CFBridgingRelease(LSCopyApplicationURLsForBundleIdentifier(
       bundleID, &cfError));
   if (array == nil) {
     NSError *nsError = (__bridge NSError *)cfError;
     fprintf(stderr, "error: %s\n", nsError.description.UTF8String);
     return nil;
   }

   // Scan all bundles but delay returning in case of errors until we are
   // done. This is to let us log details about all the bundles that were
   // processed so that a faulty bundle doesn't hide useful information about
   // other bundles that were found.
   BOOL errors = NO;
   for (NSURL *url in array) {
     NSArray *contents = [
       [NSFileManager defaultManager] contentsOfDirectoryAtURL:url
                                    includingPropertiesForKeys:nil
                                                       options:0
                                                         error:nil];
     NSLog(@"Found bundle %@ in %@; contents on disk: %@",
           bundleID, url, contents);

     NSBundle *bundle = [NSBundle bundleWithURL:url];
     if (bundle == nil) {
       NSLog(@"ERROR: Unable to open bundle at URL: %@\n", url);
       errors = YES;
       continue;
     }

     NSString *versionKey = @"CFBundleShortVersionString";
     NSString *version = [bundle.infoDictionary objectForKey:versionKey];
     if (version == nil) {
       NSLog(@"ERROR: Cannot find %@ in info for bundle %@; info: %@\n",
             versionKey, url, bundle.infoDictionary);
       errors = YES;
       continue;
     }
     NSString *expandedVersion = ExpandVersion(version);
     NSLog(@"Version strings for %@: short=%@, expanded=%@",
           url, version, expandedVersion);

     NSURL *developerDir =
         [url URLByAppendingPathComponent:@"Contents/Developer"];
     XcodeVersionEntry *entry =
         [[XcodeVersionEntry alloc] initWithVersion:expandedVersion
                                                url:developerDir];
     AddEntryToDictionary(entry, dict);
   }
   return errors ? nil : dict;
 }

 // Prints out the located Xcodes as a set of lines where each line contains the
 // list of versions for a given Xcode and its location on disk.
 static void DumpAsVersionsOnly(
   FILE *output,
   NSMutableDictionary<NSString *, XcodeVersionEntry *> *dict) {
   NSSet<XcodeVersionEntry *> *distinctValues =
       [[NSSet alloc] initWithArray:dict.allValues];
   NSMutableDictionary<NSString *, NSMutableSet <NSString *> *> *aliasDict =
       [[NSMutableDictionary alloc] init];
   [dict enumerateKeysAndObjectsUsingBlock:^(NSString *aliasVersion,
                                             XcodeVersionEntry *entry,
                                             BOOL *stop) {
     NSString *versionString = entry.version;
     if (aliasDict[versionString] == nil) {
       aliasDict[versionString] = [[NSMutableSet alloc] init];
     }
     [aliasDict[versionString] addObject:aliasVersion];
   }];
   for (NSString *version in aliasDict) {
     XcodeVersionEntry *entry = dict[version];
     fprintf(output, "%s:%s:%s\n",
             version.UTF8String,
             [[aliasDict[version] allObjects]
                    componentsJoinedByString: @","].UTF8String,
             entry.url.fileSystemRepresentation);
   }
 }

 // Prints out the located Xcodes in JSON format.
 static void DumpAsJson(
   FILE *output,
   NSMutableDictionary<NSString *, XcodeVersionEntry *> *dict) {
   fprintf(output, "{\n");
   for (NSString *version in dict) {
     XcodeVersionEntry *entry = dict[version];
     fprintf(output, "\t\"%s\": \"%s\",\n",
             version.UTF8String, entry.url.fileSystemRepresentation);
   }
   fprintf(output, "}\n");
 }

 // Dumps usage information.
 static void usage(FILE *output) {
   fprintf(
       output,
       "xcode-locator [-v|<version_number>]"
       "\n\n"
       "Given a version number or partial version number in x.y.z format, "
       "will attempt to return the path to the appropriate developer "
       "directory."
       "\n\n"
       "Omitting a version number will list all available versions in JSON "
       "format, alongside their paths."
       "\n\n"
       "Passing -v will list all available fully-specified version numbers "
       "along with their possible aliases and their developer directory, "
       "each on a new line. For example:"
       "\n\n"
       "7.3.1:7,7.3,7.3.1:/Applications/Xcode.app/Contents/Developer"
       "\n");
 }

 int main(int argc, const char * argv[]) {
   @autoreleasepool {
     NSString *versionArg = nil;
     BOOL versionsOnly = NO;
     if (argc == 1) {
       versionArg = @"";
     } else if (argc == 2) {
       NSString *firstArg = [NSString stringWithUTF8String:argv[1]];
       if ([@"-v" isEqualToString:firstArg]) {
         versionsOnly = YES;
         versionArg = @"";
       } else {
         versionArg = firstArg;
         NSCharacterSet *versSet =
             [NSCharacterSet characterSetWithCharactersInString:@"0123456789."];
         if ([versionArg rangeOfCharacterFromSet:versSet.invertedSet].length
             != 0) {
           versionArg = nil;
         }
       }
     }
     if (versionArg == nil) {
       usage(stderr);
       return 1;
     }

     NSMutableDictionary<NSString *, XcodeVersionEntry *> *dict = FindXcodes();
     if (dict == nil) {
       return 1;
     }

     XcodeVersionEntry *entry = [dict objectForKey:versionArg];
     if (entry) {
       printf("%s\n", entry.url.fileSystemRepresentation);
       return 0;
     }

     if (versionsOnly) {
       DumpAsVersionsOnly(stdout, dict);
     } else {
       DumpAsJson(stdout, dict);
     }
     return ([@"" isEqualToString:versionArg] ? 0 : 1);
   }
 }
	// Copyright 2015 Google Inc. All rights reserved.
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// http://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	// Application that finds all Xcodes installed on a given Mac and will return a
	// path for a given version number.
	//
	// If you have 7.0, 6.4.1 and 6.3 installed the inputs will map to:
	//
	// 7,7.0,7.0.0 = 7.0
	// 6,6.4,6.4.1 = 6.4.1
	// 6.3,6.3.0 = 6.3

	#if !defined(__has_feature) \|\| !__has_feature(objc_arc)
	#error "This file requires ARC support."
	#endif

	#import <CoreServices/CoreServices.h>
	#import <Foundation/Foundation.h>

	// Simple data structure for tracking a version of Xcode (i.e. 6.4) with an URL
	// to the appplication.
	@interface XcodeVersionEntry : NSObject
	@property(readonly) NSString *version;
	@property(readonly) NSURL *url;
	@end

	@implementation XcodeVersionEntry

	- (id)initWithVersion:(NSString )version url:(NSURL )url {
	if ((self = [super init])) {
	_version = version;
	_url = url;
	}
	return self;
	}

	- (id)description {
	return [NSString stringWithFormat:@"<%@ %p>: %@ %@",
	[self class], self, _version, _url];
	}

	@end

	// Given an entry, insert it into a dictionary that is keyed by versions.
	//
	// For an entry that is 6.4.1:/Applications/Xcode.app, add it for 6.4.1 and
	// optionally add it for 6.4 and 6 if it is "better" than any entry that may
	// already be there, where "better" is defined as:
	//
	// 1. Under /Applications/. (This avoids mounted xcode versions taking
	// precedence over installed versions.)
	//
	// 2. Not older (at least as high version number).
	static void AddEntryToDictionary(
	XcodeVersionEntry *entry,
	NSMutableDictionary<NSString , XcodeVersionEntry > *dict) {
	BOOL inApplications =
	[entry.url.path rangeOfString:@"/Applications/"].location != NSNotFound;
	NSString *entryVersion = entry.version;
	NSString *subversion = entryVersion;
	if (dict[entryVersion] && !inApplications) {
	return;
	}
	dict[entryVersion] = entry;
	while (YES) {
	NSRange range = [subversion rangeOfString:@"." options:NSBackwardsSearch];
	if (range.length == 0 \|\| range.location == 0) {
	break;
	}
	subversion = [subversion substringToIndex:range.location];
	XcodeVersionEntry *subversionEntry = dict[subversion];
	if (subversionEntry) {
	BOOL atLeastAsLarge = ([subversionEntry.version compare:entry.version]
	== NSOrderedDescending);
	if (inApplications && atLeastAsLarge) {
	dict[subversion] = entry;
	}
	} else {
	dict[subversion] = entry;
	}
	}
	}

	// Given a "version", expand it to at least 3 components by adding .0 as
	// necessary.
	static NSString ExpandVersion(NSString version) {
	NSArray *components = [version componentsSeparatedByString:@"."];
	NSString *appendage = nil;
	if (components.count == 2) {
	appendage = @".0";
	} else if (components.count == 1) {
	appendage = @".0.0";
	}
	if (appendage) {
	version = [version stringByAppendingString:appendage];
	}
	return version;
	}

	// Searches for all available Xcodes in the system and returns a dictionary that
	// maps version identifiers of any form (X, X.Y, and X.Y.Z) to the directory
	// where the Xcode bundle lives.
	//
	// If there is a problem locating the Xcodes, prints one or more error messages
	// and returns nil.
	static NSMutableDictionary<NSString , XcodeVersionEntry > *FindXcodes()
	__attribute((ns_returns_retained)) {
	CFStringRef bundleID = CFSTR("com.apple.dt.Xcode");

	NSMutableDictionary<NSString , XcodeVersionEntry > *dict =
	[[NSMutableDictionary alloc] init];
	CFErrorRef cfError;
	NSArray *array = CFBridgingRelease(LSCopyApplicationURLsForBundleIdentifier(
	bundleID, &cfError));
	if (array == nil) {
	NSError nsError = (__bridge NSError )cfError;
	fprintf(stderr, "error: %s\n", nsError.description.UTF8String);
	return nil;
	}

	// Scan all bundles but delay returning in case of errors until we are
	// done. This is to let us log details about all the bundles that were
	// processed so that a faulty bundle doesn't hide useful information about
	// other bundles that were found.
	BOOL errors = NO;
	for (NSURL *url in array) {
	NSArray *contents = [
	[NSFileManager defaultManager] contentsOfDirectoryAtURL:url
	includingPropertiesForKeys:nil
	options:0
	error:nil];
	NSLog(@"Found bundle %@ in %@; contents on disk: %@",
	bundleID, url, contents);

	NSBundle *bundle = [NSBundle bundleWithURL:url];
	if (bundle == nil) {
	NSLog(@"ERROR: Unable to open bundle at URL: %@\n", url);
	errors = YES;
	continue;
	}

	NSString *versionKey = @"CFBundleShortVersionString";
	NSString *version = [bundle.infoDictionary objectForKey:versionKey];
	if (version == nil) {
	NSLog(@"ERROR: Cannot find %@ in info for bundle %@; info: %@\n",
	versionKey, url, bundle.infoDictionary);
	errors = YES;
	continue;
	}
	NSString *expandedVersion = ExpandVersion(version);
	NSLog(@"Version strings for %@: short=%@, expanded=%@",
	url, version, expandedVersion);

	NSURL *developerDir =
	[url URLByAppendingPathComponent:@"Contents/Developer"];
	XcodeVersionEntry *entry =
	[[XcodeVersionEntry alloc] initWithVersion:expandedVersion
	url:developerDir];
	AddEntryToDictionary(entry, dict);
	}
	return errors ? nil : dict;
	}

	// Prints out the located Xcodes as a set of lines where each line contains the
	// list of versions for a given Xcode and its location on disk.
	static void DumpAsVersionsOnly(
	FILE *output,
	NSMutableDictionary<NSString , XcodeVersionEntry > *dict) {
	NSSet<XcodeVersionEntry > distinctValues =
	[[NSSet alloc] initWithArray:dict.allValues];
	NSMutableDictionary<NSString , NSMutableSet <NSString > > aliasDict =
	[[NSMutableDictionary alloc] init];
	[dict enumerateKeysAndObjectsUsingBlock:^(NSString *aliasVersion,
	XcodeVersionEntry *entry,
	BOOL *stop) {
	NSString *versionString = entry.version;
	if (aliasDict[versionString] == nil) {
	aliasDict[versionString] = [[NSMutableSet alloc] init];
	}
	[aliasDict[versionString] addObject:aliasVersion];
	}];
	for (NSString *version in aliasDict) {
	XcodeVersionEntry *entry = dict[version];
	fprintf(output, "%s:%s:%s\n",
	version.UTF8String,
	[[aliasDict[version] allObjects]
	componentsJoinedByString: @","].UTF8String,
	entry.url.fileSystemRepresentation);
	}
	}

	// Prints out the located Xcodes in JSON format.
	static void DumpAsJson(
	FILE *output,
	NSMutableDictionary<NSString , XcodeVersionEntry > *dict) {
	fprintf(output, "{\n");
	for (NSString *version in dict) {
	XcodeVersionEntry *entry = dict[version];
	fprintf(output, "\t\"%s\": \"%s\",\n",
	version.UTF8String, entry.url.fileSystemRepresentation);
	}
	fprintf(output, "}\n");
	}

	// Dumps usage information.
	static void usage(FILE *output) {
	fprintf(
	output,
	"xcode-locator [-v\|<version_number>]"
	"\n\n"
	"Given a version number or partial version number in x.y.z format, "
	"will attempt to return the path to the appropriate developer "
	"directory."
	"\n\n"
	"Omitting a version number will list all available versions in JSON "
	"format, alongside their paths."
	"\n\n"
	"Passing -v will list all available fully-specified version numbers "
	"along with their possible aliases and their developer directory, "
	"each on a new line. For example:"
	"\n\n"
	"7.3.1:7,7.3,7.3.1:/Applications/Xcode.app/Contents/Developer"
	"\n");
	}

	int main(int argc, const char * argv[]) {
	@autoreleasepool {
	NSString *versionArg = nil;
	BOOL versionsOnly = NO;
	if (argc == 1) {
	versionArg = @"";
	} else if (argc == 2) {
	NSString *firstArg = [NSString stringWithUTF8String:argv[1]];
	if ([@"-v" isEqualToString:firstArg]) {
	versionsOnly = YES;
	versionArg = @"";
	} else {
	versionArg = firstArg;
	NSCharacterSet *versSet =
	[NSCharacterSet characterSetWithCharactersInString:@"0123456789."];
	if ([versionArg rangeOfCharacterFromSet:versSet.invertedSet].length
	!= 0) {
	versionArg = nil;
	}
	}
	}
	if (versionArg == nil) {
	usage(stderr);
	return 1;
	}

	NSMutableDictionary<NSString , XcodeVersionEntry > *dict = FindXcodes();
	if (dict == nil) {
	return 1;
	}

	XcodeVersionEntry *entry = [dict objectForKey:versionArg];
	if (entry) {
	printf("%s\n", entry.url.fileSystemRepresentation);
	return 0;
	}

	if (versionsOnly) {
	DumpAsVersionsOnly(stdout, dict);
	} else {
	DumpAsJson(stdout, dict);
	}
	return ([@"" isEqualToString:versionArg] ? 0 : 1);
	}
	}