git-log2json.sh

#!/usr/bin/env bash

# generate git log array in JSON:

git log \
    --pretty=format:'{%n  "commit": "%H",%n  "author": "%an <%ae>",%n  "date": "%ad",%n  "message": "%f"%n},' \
    $@ | \
    perl -pe 'BEGIN{print "["}; END{print "]\n"}' | \
    perl -pe 's/},]/}]/' > logAcc.json

git-stat2json.sh

#!/usr/bin/env bash

# generate git log --stats array in JSON

git log \
    --numstat \
    --format='%H' \
    $@ | \
    perl -lawne '
        if (defined $F[1]) {
            print qq#{"insertions": "$F[0]", "deletions": "$F[1]", "path": "$F[2]"},#
        } elsif (defined $F[0]) {
            print qq#],\n"$F[0]": [#
        };
        END{print qq#],#}' | \
    tail -n +2 | \
    perl -wpe 'BEGIN{print "{"}; END{print "}"}' | \
    tr '\n' ' ' | \
    perl -wpe 's#(]|}),\s*(]|})#$1$2#g' | \
    perl -wpe 's#,\s*?}$#}#' > logStats.json

merge.js

/*
 * OPTIONAL: use this Node.js expression to merge the data structures
 * created by the two shell scripts above
 */

var logAcc, lstat;

logAcc = require('logAcc.json');
lstat = require('logStats.json');

logAcc.map(function(o){
    o.stat = lstat[o.commit];
});