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COVER(1p) User Contributed Perl Documentation COVER(1p)

NAME
cover - report coverage statistics

VERSION
version 1.40

SYNOPSIS
cover -test

cover -report html_basic

DESCRIPTION
Report coverage statistics in a variety of formats.

The summary option produces a short textual summary. Other reports are available by using
the report option.

The following reports are currently available:

html - detailed HTML reports (default)
html_basic - detailed HTML reports with syntax highlighting
text - detailed textual summary
compilation - output in a format similar to Perl errors
json - output in a JSON format
vim - show coverage information in vim gutter

OPTIONS
The following command line options are supported:

-h -help - show help
-i -info - show documentation
-v -version - show version

-silent - don't print informational messages (default off)
-summary - give summary report (default on)
-report report_format - report format (default html)
-outputdir dir - directory for output (default given db)
-launch - launch report in viewer (if avail) (default off)

-select filename - only report on the file (default all)
-ignore filename - don't report on the file (default none)
-select_re RE - append to REs of files to select (default none)
-ignore_re RE - append to REs of files to ignore (default none)
-relative_only - for XS, ignore absolute paths (default off)
-gcov_chdir - for XS, run gcov in subdirs (default off)
-write [db] - write the merged database (default off)
-delete - drop database(s) (default off)
-dump_db - dump database(s) (for debugging) (default off)

-coverage criterion - report on criterion (default all available)

-test - drop database(s) and run make test (default off)
-gcov - run gcov to cover XS code (default on if using gcc)
-make make_prog - use the given 'make' program for 'make test'
-prefer_lib - prefer files in lib (default off)
-ignore_covered_err - allow coverung uncoverable code (default off)

-add_uncoverable_point string
-delete_uncoverable_point string
-clean_uncoverable_points
-uncoverable_file file

other options specific to the report format

coverage_database [coverage_database ...]

The "-report", "-select", "-ignore", "-select_re", "-ignore_re", and "-coverage" options may
be specified multiple times.

REPORT FORMATS
The following "-report" options are available in the core module. Other reports may be
available if they've been installed from external packages.

html|html_minimal (default)
HTML reporting. Percentage thresholds are colour-coded and configurable via -report_c0
<integer>, -report_c1 <integer> and -report_c2 <integer>.:

0% 75% 90% 100%
| .. | .. | .. |
<c0 <c1 <c2 c3
red yellow orange green

html_basic
HTML reporting with syntax highlighting if PPI::HTML or Perl::Tidy module is detected.
Like html|html_minimal reporting, percentage thresholds are colour-coded and
configurable.

text
Plain text reporting.

compilation
A textual report in a format similar to that output by Perl itself such that the report
may be used by your editor or other reporting tools to show where coverage is missing.

json
A report in JSON format.

vim A report suitable for use with the vim editor to show coverage data in the sign column.

DETAILS
Any number of coverage databases may be specified on the command line. These databases will
be merged and the reports will be based on the merged information. If no databases are
specified the default database (cover_db) will be used.

The "-write" option will write out the merged database. If no name is given for the new
database, the first database read in will be overwritten. When this option is used no
reports are generated by default.

Specify the "-select", "-select_re", "-ignore", and "-ignore_re" options to report on
specific files. "-select" and "-ignore" are interpreted as shell globs; "-select_re" and
"-ignore_re" are interpreted as regular expressions.

Specify "-coverage" options to report on specific criteria. By default all available
information on all criteria in all files will be reported. Available coverage options are
statement, branch, condition, subroutine, pod, and default (which equates to all available
options). However, if you know you only want coverage information for certain criteria it is
better to only collect data for those criteria in the first place by specifying them at that
point. This will make the data collection and reporting processes faster and less memory
intensive. See the documentation for Devel::Cover for more information.

If you want all *except* some criteria, then you can say something like "-coverage
default,-pod".

If you specify multiple "-report" options, make sure that they do not conflict. For example,
the different HTML reports will overwrite each other's results.

The "-test" option will delete the databases and run your tests to generate new coverage data
before reporting on it. Devel::Cover knows how to work with standard Perl Makefiles as well
as Module::Build based distributions. For detailed instructions see the documentation for
ExtUtils::MakeMaker at <https://metacpan.org/module/ExtUtils::MakeMaker> or for Module::Build
at <https://metacpan.org/module/Module::Build> both of which come as standard in recent Perl
distributions.

The "-gcov" option will try to run gcov on any XS code. This requires that you are using gcc
of course. If you are using the "-test" option will be turned on by default. If you have XS
code in subdirectories, you will probably need to add the "-gcov_chdir" option since gcov
seems to work better with that.

The "-prefer_lib" option tells Devel::Cover to report on files in the lib directory even if
they were used from the blib directory.

The "-ignore_covered_err" option will not flag an error if uncoverable code is covered.

EXIT STATUS
The following exit values are returned:

0 All operations were completed successfully.

>0 An error occurred.

With the -test option the exit status of the underlying test run is returned.

man > cover(1p)