term_height

 term_height() -> [status, msg, payload, meta]

Try to determine the sane terminal height.

First will observe the LINES environment variable, and use it if defined. Note that in a Unix shell like bash, COLUMNS and LINES are shell variables and not environment variables, so they are not inherited by child processes. You usually set the LINES environment variable when you want to override the terminal height.

Then, if LINES is not defined, will try to use the Perl module Term::Size to determine the terminal size and use the result if succeed.

Third, if the Perl module is not available, will run "tput lines" and use the output returned by tput if succeed.

Otherwise will use the default value of 25.

This function is not exported.

No arguments.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

term_width

 term_width() -> [status, msg, payload, meta]

Try to determine the sane terminal width.

First will observe the COLUMNS environment variable, and use it if defined. Note that in a Unix shell like bash, COLUMNS and LINES are shell variables and not environment variables, so they are not inherited by child processes. You usually set the COLUMNS environment variable when you want to override the terminal width.

Then, if COLUMNS is not defined, will try to use Perl module Term::Size to determine the terminal size and use the result if succeed.

Third, if the Perl module is not available, will run "tput cols" and use the output returned by tput if succeed.

Otherwise will use the default value of 80 (79 on Windows; the default command prompt window is 80x25 but printing one character on rightmost column will cause the cursor to move to the next line, so we choose 80-1).

This function is not exported.

No arguments.

Returns an enveloped result (an array).

First element (status) is an integer containing HTTP status code (200 means OK, 4xx caller error, 5xx function error). Second element (msg) is a string containing error message, or 'OK' if status is 200. Third element (payload) is optional, the actual result. Fourth element (meta) is called result metadata and is optional, a hash that contains extra information.

Return value: (any)

COLUMNS

LINES