<p>I’ve started integrating the GitRuby raw access library, a way to interact with Git in pure ruby, into Grit in my fork. It’s not quite done – it won’t work with things like the ‘<span class="caps">XXX</span>…<span class="caps">YYY</span>’ range strings in log, or the ‘skip’ dingus, but it does work for a number of things. I’ve implemented it as a module that is included in the Grit::Git class – since all the git calls are captured by the ‘method_missing’ function, I simply implement the ones I want to override and try in pure ruby – if I can’t do it, sometimes I fall back to the method_missing, which will do a ‘git’ system call.</p>
<p>So far I’ve overridden the cat_file, ls_tree, rev_parse and the rev_list and log functions (which are essentially the same thing, since we’re passing —pretty=“raw” to rev-list, which makes it identical to ‘git log’). There are significant speed increases in the short calls (like cat-file, ls_tree, etc) and only becomes worse than the system calls if we’re doing some massive commit walk (‘git rev-list —all’, for example).</p>
<h3>Grit 0.7.0</h3>
<pre class="console">
user system total real
packobj 0.030000 0.260000 1.320000 ( 1.344565)
commits 1 0.030000 0.070000 0.380000 ( 0.366209)
commits 2 0.110000 0.160000 0.830000 ( 0.802311)
big revlist 0.330000 0.130000 0.830000 ( 0.795258)
log 0.380000 0.140000 0.880000 ( 0.856951)
diff 0.330000 0.190000 2.080000 ( 2.072242)
commit-diff 0.690000 0.250000 1.560000 ( 1.521016)
heads 0.000000 0.070000 0.360000 ( 0.376296)
</pre>
<h3>Grit Edge (with GitRuby) :</h3>
<pre class="console">
user system total real
packobj 0.050000 0.000000 0.050000 ( 0.051167)
commits 1 0.140000 0.010000 0.150000 ( 0.164900)
commits 2 0.430000 0.030000 0.460000 ( 0.454646)
big revlist 1.540000 0.100000 1.640000 ( 1.637204)
log 0.480000 0.030000 0.510000 ( 0.512445)
diff 0.200000 0.190000 1.970000 ( 1.905014)
commit-diff 0.550000 0.240000 1.420000 ( 1.366508)
heads 0.020000 0.090000 0.410000 ( 0.402519)
</pre>
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