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function [formatted,treeish] = VersionControlIdentifier()
% This function gives the (git) commit ID of matlab2tikz
%
% This assumes the standard directory structure as used by Nico's master branch:
% SOMEPATH/src/matlab2tikz.m with a .git directory in SOMEPATH.
%
% The HEAD of that repository is determined from file system information only
% by following dynamic references (e.g. ref:refs/heds/master) in branch files
% until an absolute commit hash (e.g. 1a3c9d1...) is found.
% NOTE: Packed branch references are NOT supported by this approach
MAXITER = 10; % stop following dynamic references after a while
formatted = '';
REFPREFIX = 'ref:';
isReference = @(treeish)(any(strfind(treeish, REFPREFIX)));
treeish = [REFPREFIX 'HEAD'];
try
% get the matlab2tikz directory
privateDir = fileparts(mfilename('fullpath'));
gitDir = fullfile(privateDir,'..','..','.git');
nIter = 1;
while isReference(treeish)
refName = treeish(numel(REFPREFIX)+1:end);
branchFile = fullfile(gitDir, refName);
if exist(branchFile, 'file') && nIter < MAXITER
% The FID is reused in every iteration, so `onCleanup` cannot
% be used to `fclose(fid)`. But since there is very little that
% can go wrong in a single `fscanf`, it's probably best to leave
% this part as it is for the time being.
fid = fopen(branchFile,'r');
treeish = fscanf(fid,'%s');
fclose(fid);
nIter = nIter + 1;
else % no branch file or iteration limit reached
treeish = '';
return;
end
end
catch %#ok
treeish = '';
end
if ~isempty(treeish)
formatted = [' Commit & ' treeish ' \\\\ \n'];
end
%TODO: do the formatting somewhere else!
end
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