Github user bso-intel commented on a diff in the pull request:

    https://github.com/apache/cordova-lib/pull/395#discussion_r53545261
  
    --- Diff: cordova-lib/src/cordova/platform.js ---
    @@ -79,148 +79,156 @@ function addHelper(cmd, hooksRunner, projectRoot, 
targets, opts) {
         var platformsDir = path.join(projectRoot, 'platforms');
         shell.mkdir('-p', platformsDir);
     
    -    return hooksRunner.fire('before_platform_' + cmd, opts)
    -    .then(function() {
    -        return promiseutil.Q_chainmap(targets, function(target) {
    -            // For each platform, download it and call its helper script.
    -            var parts = target.split('@');
    -            var platform = parts[0];
    -            var spec = parts[1];
    -
    -            return Q.when().then(function() {
    -                if (!(platform in platforms)) {
    -                    spec = platform;
    -                    platform = null;
    -                }
    +    return promiseutil.Q_chainmap(targets, function(target) {
    +        // For each platform, download it and call its helper script.
    +        var parts = target.split('@');
    +        var platform = parts[0];
    +        var spec = parts[1];
    +        var platDetails = '';
    +
    +        return Q.when().then(function() {
    +            if (!(platform in platforms)) {
    +                spec = platform;
    +                platform = null;
    +            }
     
    -                if(platform === 'amazon-fireos') {
    -                    events.emit('warn', 'amazon-fireos has been 
deprecated. Please use android instead.');
    -                }
    -                if(platform === 'wp8') {
    -                    events.emit('warn', 'wp8 has been deprecated. Please 
use windows instead.');
    -                }
    -                if (platform && !spec && cmd == 'add') {
    -                    events.emit('verbose', 'No version supplied. 
Retrieving version from config.xml...');
    -                    spec = getVersionFromConfigFile(platform, cfg);
    -                }
    +            if(platform === 'amazon-fireos') {
    +                events.emit('warn', 'amazon-fireos has been deprecated. 
Please use android instead.');
    +            }
    +            if(platform === 'wp8') {
    +                events.emit('warn', 'wp8 has been deprecated. Please use 
windows instead.');
    +            }
    +            if (platform && !spec && cmd == 'add') {
    +                events.emit('verbose', 'No version supplied. Retrieving 
version from config.xml...');
    +                spec = getVersionFromConfigFile(platform, cfg);
    +            }
    +
    +            // If --save/autosave on && no version specified, use the 
pinned version
    +            // e.g: 'cordova platform add android --save', 'cordova 
platform update android --save'
    +            if( (opts.save || autosave) && !spec ){
    +                spec = platforms[platform].version;
    +            }
     
    -                // If --save/autosave on && no version specified, use the 
pinned version
    -                // e.g: 'cordova platform add android --save', 'cordova 
platform update android --save'
    -                if( (opts.save || autosave) && !spec ){
    -                    spec = platforms[platform].version;
    +            if (spec) {
    +                var maybeDir = cordova_util.fixRelativePath(spec);
    +                if (cordova_util.isDirectory(maybeDir)) {
    +                    return getPlatformDetailsFromDir(maybeDir, platform);
    +                }
    +            }
    +            return downloadPlatform(projectRoot, platform, spec, opts);
    +        }).then(function(platformDetails) {
    +            platDetails = platformDetails;
    +            var hookOpts = {
    +                platforms :[platDetails.platform],
    +                nohooks :[opts.nohooks]
    +            };
    +            return hooksRunner.fire('before_platform_' + cmd, hookOpts);
    --- End diff --
    
    Now, the behavior is a little different than before.
    Previously, the before_platform_add hook ran only once for all target 
platforms.
    This hook could be platform agnostic.
    However, by moving the hookRunner inside per platform, this hook will run 
every time each platform is added.
    Not sure whether this is an issue or not, though.


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