writegitinfoheader corrected with usable options

- empty option corrected
- strict option added

build/simulink_codegen/writegitinfoheader.m

-function writegitinfoheader(empty)
+% Performs rtccode git tagging and
+% code version string .h generation
+%
+% input arguments:
+% varargin{1}: boolean, if true no git tagging will be performed
+%                       and an empty .h code ver string will be
+%                       generated. If false (default) git tagging 
+%                       will be attemped
+% varargin{2}: boolean, if true (default) git working copy cleanlyness
+%                       and remote sync will be checked. If false
+%                       it will be checked but only warnings will
+%                       be issued in case of violation.
+
+function writegitinfoheader(varargin)
    % max code description string length
    maxdesclen=1024;
 
+   if nargin==0
+       empty=false;
+       strict=true;
+   end
+   if nargin==1
+       empty=varargin{1};
+       strict=true;
+   end
+   if nargin==2
+       empty=varargin{1};
+       strict=varargin{2};
+   end    
+   
    if empty==false
        % scd expcode info retrieval
        try
@@ -19,14 +45,22 @@ function writegitinfoheader(empty)
        % TODO: check that the output of 'git status -procelain' is empty
        [~,result] = system('git status --porcelain');
        if ~isempty(result)
-           error('the working copy is not clean, please commit changes first.');
+           if ~strict
+              warning('the working copy is not clean, please commit changes first.');
+           else
+              error('the working copy is not clean, please commit changes first.');
+           end
        end
        
        % 2) check local and remote hash are matching (in synch working copy)
        [~,localhash]  = system('git rev-parse @');
        [~,remotehash] = system('git rev-parse @{u}');
        if ~strcmp(localhash, remotehash)
-           error('the working copy is not in sync with its origin, please push first.');
+           if ~strict
+               warning('the working copy is not in sync with its origin, please push first.');
+           else
+               error('the working copy is not in sync with its origin, please push first.');
+           end 
        end
        
        % first we get TCV current shot number, to be used for tagging
@@ -91,9 +125,11 @@ function writegitinfoheader(empty)
            descstr=descstr(1:numel(descstr));
            fprintf('WARNING: code description string truncated!\n');
        end       
-   end
+   else
+   
+       descstr = 'n/a';
    
-   descstr = 'n/a';
+   end
    
    fprintf('Code decription string will be set to:\n%s\n', descstr);
       
@@ -125,26 +161,27 @@ function writegitinfoheader(empty)
    % can be kept 
    
    answ = input('Ok to clean build folder [(Y)es/(N)o]?','s');
-   switch upper(answ)
-       case 'Y'
-       otherwise
-            return
+   
+   if upper(answ)=='Y'
+       try
+           cfg=Simulink.fileGenControl('getConfig');
+           codegenfolder=cfg.CodeGenFolder;
+           cleancmd = ['rm -rf ' codegenfolder '/SCD_rtccode*'];
+           [status,result]  = system(cleancmd);
+           
+           if result~=0
+               warning('Build folder could not be cleaned properly with the command: %s',cleancmd);
+               status
+           else
+               fprintf('Cleaned with command: %s\n', cleancmd);
+           end
+       catch ME
+           warning('Exception cleaning expcode build folder %s', codegenfolder);
+       end
    end
    
-   try
-      cfg=Simulink.fileGenControl('getConfig');
-      codegenfolder=cfg.CodeGenFolder;
-      cleancmd = ['rm -rf ' codegenfolder '/SCD_rtccode*'];
-      [status,result]  = system(cleancmd);
-      
-      if result~=0
-          warning('Build folder could not be cleaned properly with the command: %s',cleancmd);
-          status
-      else
-          fprintf('Cleaned with command: %s\n', cleancmd);
-      end
-   catch ME
-       warning('Exception cleaning expcode build folder %s', codegenfolder);
+   if ~empty
+       fprintf('All done, remember to publish tag with ''git push --tags''\n');
    end
-      
+   
 end
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