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coverage_diff

An escript to analyse coverage difference reported at coveralls.io service.
Draft version of the tool created by fenek.

Build

$ rebar3 escriptize

Run

$ cd _build/default/bin/
$ ./coverage_diff [-c cache_directory] [--md] build1 build2

Arguments

-c cache_directory
   Loading of the data from coveralls.io takes time, it has sence to cache it if 
   want to make a couple of comparisons between different builds
--md 
   generate markdown report, useful if you want to add report as comment to GitHub.

Meaning of the table columns

Diff table:
   Cov1/Cov2 - coverage in build1/build2
   dCov      - coverage difference
   dR        - difference in number of relevant (coverable) code lines
   dN        - difference in number of noncovered (relevant) code lines
   
New/Removed files table:
   Rel      - number of relevant code lines in the file
   Non      - number of noncovered code line

Examples

Plain text output

$ ./coverage_diff -c . 14118700 14117699

coverage_diff:main(["-c",".","14118700","14117699"])

================================================================================

Total coverage for 14118700: 66.616%
Total coverage for 14117699: 70.859%
Noncovered lines count delta: 1452

================================================================================

| File                           |   Cov1  |    Cov2  |     dCov  |  dR |  dN |
|--------------------------------|---------|----------|-----------|-----|-----|
| mongoose_riak_sup.erl          |  0.000% | 100.000% | -100.000% |   0 |  19 |
| mam_message_xml.erl            |  0.000% | 100.000% | -100.000% |   0 |   3 |
| mod_offline_riak.erl           |  0.000% |  96.429% |  -96.429% |   0 |  54 |
| mod_last_riak.erl              |  0.000% |  95.238% |  -95.238% |   0 |  20 |
| mod_roster_riak.erl            |  0.000% |  94.118% |  -94.118% |   0 |  64 |
| mod_vcard_riak.erl             |  0.000% |  91.525% |  -91.525% |   0 |  54 |
| mod_mam_riak_timed_arch_yz.erl |  0.000% |  87.963% |  -87.963% |   0 | 190 |
| mongoose_riak.erl              | 13.889% |  97.222% |  -83.333% |   0 |  30 |
| mod_private_riak.erl           |  0.000% |  81.818% |  -81.818% |   0 |  18 |
| mod_privacy_riak.erl           |  0.000% |  81.818% |  -81.818% |   0 |  36 |
| ejabberd_auth_riak.erl         |  0.000% |  81.818% |  -81.818% |   0 |  63 |
| mongoose_fips.erl              | 41.176% |  75.000% |  -33.824% |  13 |   9 |
| ejabberd_binary.erl            | 55.556% |  88.889% |  -33.333% |   0 |   3 |
| mongoose_lib.erl               | 41.667% |  50.000% |   -8.333% |   0 |   1 |
| ELDAPv3.erl                    | 14.709% |  22.713% |   -8.004% | 690 | 690 |
| mod_mam_utils.erl              | 82.979% |  88.339% |   -5.360% |  -1 |  15 |
| eldap_filter_yecc.erl          | 15.236% |  20.233% |   -4.996% | 141 | 141 |
| mod_mam_odbc_prefs.erl         | 95.604% |  98.901% |   -3.297% |   0 |   3 |
| mod_bosh_socket.erl            | 80.464% |  81.457% |   -0.993% |   0 |   3 |
| p1_fsm_old.erl                 | 35.849% |  36.604% |   -0.755% |   0 |   2 |
| mongoose_rdbms.erl             | 68.493% |  69.178% |   -0.685% |   0 |   1 |
| ejabberd_config.erl            | 63.347% |  63.771% |   -0.424% |   0 |   2 |
| ejabberd_app.erl               | 83.333% |  83.750% |   -0.417% |  -2 |   0 |
| mod_mam.erl                    | 89.577% |  89.902% |   -0.326% |   0 |   1 |
| mod_muc.erl                    | 68.144% |  68.421% |   -0.277% |   0 |   1 |

================================================================================

| Removed files             | Coverage | Rel | Non |
|---------------------------|----------|-----|-----|
| mongoose_deprecations.erl |  96.429% |  28 |   1 |

================================================================================

Markdown output

$ ./coverage_diff --md -c . 14118700 14117699

coverage_diff:main(["--md","-c",".","14118700","14117699"])

================================================================================

Total coverage for 14118700: 66.616%
Total coverage for 14117699: 70.859%
Noncovered lines count delta: 1452

================================================================================

coverage decrease analysis between 14118700 and 14117699

File Cov1 Cov2 dCov dR dN
mongoose_riak_sup.erl 0.000% 100.000% -100.000% 0 19
mam_message_xml.erl 0.000% 100.000% -100.000% 0 3
mod_offline_riak.erl 0.000% 96.429% -96.429% 0 54
mod_last_riak.erl 0.000% 95.238% -95.238% 0 20
mod_roster_riak.erl 0.000% 94.118% -94.118% 0 64
mod_vcard_riak.erl 0.000% 91.525% -91.525% 0 54
mod_mam_riak_timed_arch_yz.erl 0.000% 87.963% -87.963% 0 190
mongoose_riak.erl 13.889% 97.222% -83.333% 0 30
mod_private_riak.erl 0.000% 81.818% -81.818% 0 18
mod_privacy_riak.erl 0.000% 81.818% -81.818% 0 36
ejabberd_auth_riak.erl 0.000% 81.818% -81.818% 0 63
mongoose_fips.erl 41.176% 75.000% -33.824% 13 9
ejabberd_binary.erl 55.556% 88.889% -33.333% 0 3
mongoose_lib.erl 41.667% 50.000% -8.333% 0 1
ELDAPv3.erl 14.709% 22.713% -8.004% 690 690
mod_mam_utils.erl 82.979% 88.339% -5.360% -1 15
eldap_filter_yecc.erl 15.236% 20.233% -4.996% 141 141
mod_mam_odbc_prefs.erl 95.604% 98.901% -3.297% 0 3
mod_bosh_socket.erl 80.464% 81.457% -0.993% 0 3
p1_fsm_old.erl 35.849% 36.604% -0.755% 0 2
mongoose_rdbms.erl 68.493% 69.178% -0.685% 0 1
ejabberd_config.erl 63.347% 63.771% -0.424% 0 2
ejabberd_app.erl 83.333% 83.750% -0.417% -2 0
mod_mam.erl 89.577% 89.902% -0.326% 0 1
mod_muc.erl 68.144% 68.421% -0.277% 0 1 
================================================================================
Removed files Coverage Rel Non
mongoose_deprecations.erl 96.429% 28 1 
================================================================================