Calculating the size of the Drupal Codebase.

This post demonstrates how to calculate the lines of PHP, JavaScript, and CSS code between Drupal 6 and 7, leveraging cloc a “command line tool that counts blank lines, comment lines, and physical lines of source code in many programming languages.”

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The codebase has generally trippled in size between Drupal 6 and Drupal 7. CSS and PHP code has doubled. Javascript code has quadrupled — a nod to the clear importance of Javascript and the growing Jquery library and JS dependencies included in Drupal core. The vast majority of the size increase comes from code comments.

Criteria Drupal 6.20 Drupal 7.0
PHP files 204 484
Javascript files 23 84
CSS files 59 116
Ignored files 15 33
Total files 345 852
PHP comments 22,792 79,315
JS comments 936 2,808
CSS comments 409 1,098
Total comments 24,182 83,224
PHP lines of code 48,091 161,322
JS lines of code 2,347 5,085
CSS lines of code 4,305 8,909
Total lines of code 55,410 178,290
3rd Gen Equivalent 178,130.60 589,530.79

Note: The cloc documentation page says that the 3rd gen. equiv. value should be “taken with a large grain of salt.”

Background and procedure

Thanks to this post comparing Django to Rails for inspiration, the basic procedure is to download and install cloc a command line tool that calculate lines of code, comments, etc.

1. Install cloc command line tool.

You can use homebrew or download the source (perl script) from Sourceforge.

2. Download Drupal 6.20 and 7.0

$ drush dl drupal-6.20
$ drush dl drupal-7.0

3. Calculate lines of code of Drupal 6

$ cloc --force-lang=PHP,install --force-lang=PHP,module --force-lang=PHP,inc --force-lang=PHP,test --force-lang=PHP,profile --force-lang=Make,info -3 drupal-6.20/
     345 text files.
     345 unique files.
      15 files ignored.

http://cloc.sourceforge.net v 1.53  T=1.0 s (330.0 files/s, 87353.0 lines/s)
-------------------------------------------------------------------------------
Language          files     blank   comment      code    scale   3rd gen. equiv
-------------------------------------------------------------------------------
PHP                 204      6819     22792     48091 x   3.50 =      168318.50
CSS                  59       457       409      4305 x   1.00 =        4305.00
Javascript           23       356       936      2347 x   1.48 =        3473.56
make                 39        78         0       406 x   2.50 =        1015.00
Bourne Shell          4        25         3       134 x   3.81 =         510.54
Perl                  1        26        42       127 x   4.00 =         508.00
-------------------------------------------------------------------------------
SUM:                330      7761     24182     55410 x   3.21 =      178130.60
-------------------------------------------------------------------------------

4. Calculate lines of code of Drupal 7

$ cloc --force-lang=PHP,install --force-lang=PHP,module --force-lang=PHP,inc --force-lang=PHP,test --force-lang=PHP,profile --force-lang=Make,info -3 drupal-7.0/
     852 text files.
     847 unique files.
      33 files ignored.

http://cloc.sourceforge.net v 1.53  T=9.0 s (90.8 files/s, 31723.2 lines/s)
-------------------------------------------------------------------------------
Language          files     blank   comment      code    scale   3rd gen. equiv
-------------------------------------------------------------------------------
PHP                 484     21962     79315    161322 x   3.50 =      564627.00
CSS                 116       810      1098      8909 x   1.00 =        8909.00
Javascript           84       815      2808      5085 x   1.48 =        7525.80
make                108       226         0      1363 x   2.50 =        3407.50
Bourne Shell          8       172         3      1060 x   3.81 =        4038.60
XML                  12         3         0       441 x   1.90 =         837.90
HTML                  3         4         0        69 x   1.90 =         131.10
ASP.Net               1         3         0        40 x   1.29 =          51.60
SQL                   1         0         0         1 x   2.29 =           2.29
-------------------------------------------------------------------------------
SUM:                817     23995     83224    178290 x   3.31 =      589530.79
-------------------------------------------------------------------------------
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