NAME

App::td - Manipulate table data

VERSION

This document describes version 0.091 of App::td (from Perl distribution App-td), released on 2019-01-16.

FUNCTIONS

td

Usage:

 td(%args) -> [status, msg, payload, meta]

Manipulate table data.

td receives table data from standard input and performs an action on it. It has functionality similar to some Unix commands like head, tail, wc, cut, sort except that it operates on table rows/columns instead of lines/characters. This is convenient to use with CLI scripts that output table data.

A table data is JSON-encoded data in the form of either: hos (hash of scalars, which is viewed as a two-column table where the columns are key and value), aos (array of scalars, which is viewed as a 1-column array where the column is elem), aoaos (array of arrays of scalars), or aohos (array of hashes of scalars).

The input can also be an enveloped table data, where the envelope is an array: [status, message, content, meta] and content is the actual table data. This kind of data is produced by Perinci::CmdLine-based scripts and can contain more detailed table specification in the meta hash, which td can parse.

First you might want to use the info action to see if the input is a table data:

 % osnames -l --json | td info

If input is not valid JSON, a JSON parse error will be displayed. If input is valid JSON but not a table data, another error will be displayed. Otherwise, information about the table will be displayed (form, number of columns, column names, number of rows, and so on).

Next, you can use these actions:

 # count number of rows (equivalent to "wc -l" Unix command)
 % osnames -l --json | td rowcount
 
 # append a row containing rowcount
 % osnames -l --json | td rowcount-row
 
 # return the column names only
 % lcpan related-mods Perinci::CmdLine | td colnames
 
 # append a row containing column names
 % lcpan related-mods Perinci::CmdLine | td colnames-row
 
 # count number of columns
 % osnames -l --json | td colcount
 
 # select some columns
 % osnames -l --json | td select value description
 # select all columns but some
 % osnames -l --json | td select '*' -e value -e description
 
 # only show first 5 rows
 % osnames -l --json | td head -n5
 # show all but the last 5 rows
 % osnames -l --json | td head -n -5
 
 # only show last 5 rows
 % osnames -l --json | td tail -n5
 # show rows from the row 5 onwards
 % osnames -l --json | td tail -n +5
 
 # sort by column(s) (add "-" prefix to for descending order)
 % osnames -l --json | td sort value tags
 % osnames -l --json | td sort -- -value
 
 # return sum of all numeric columns
 % list-files -l --json | td sum
 
 # append a sum row
 % list-files -l --json | td sum-row
 
 # return average of all numeric columns
 % list-files -l --json | td avg
 
 # append an average row
 % list-files -l --json | td avg-row
 
 # add a row number column (1, 2, 3, ...)
 % list-files -l --json | td rownum-col

Use this to list all the available actions:

 % td actions
 % td actions -l ;# show details

This function is not exported.

Arguments ('*' denotes required arguments):

• action* => str

  Action to perform on input table.

• argv => array[str] (default: [])

  Arguments.

• detail => bool

• exclude_columns => array[str]

• lines => str

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)

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/App-td.

SOURCE

Source repository is at https://github.com/perlancar/perl-App-td.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=App-td

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

SEE ALSO

Rinci::function for a more detailed explanation on enveloped result.

TableDef for more detailed explanation of table data definition, which can be specified in enveloped result's `meta` hash in the `table` key (see Perinci::Sub::Property::result::table).

TableData::Object

Perinci::CmdLine

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2019, 2017, 2016, 2015 by perlancar@cpan.org.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

cpanm App::td

perl -MCPAN -e shell
install App::td