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App-CSVUtils-0.046
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/ App::CSVUtils::Manual::Cookbook

NAME

App::CSVUtils::Manual::Cookbook - App::CSVUtils cookbook

VERSION

This document describes version 0.046 of App::CSVUtils::Manual::Cookbook (from Perl distribution App-CSVUtils), released on 2022-10-25.

DESCRIPTION

This document lists the various tasks you can do with the scripts included in App::CSVUtils distribution.

Example 1.csv content:

name,age,rank
andi,25,120
budi,28,115
cinta,19,142
derry,33,121

ADDING COLUMNS

With csv-add-field, we add a new column named foo with the content calculated from Perl code:

% csv-add-field 1.csv foo '$main::rownum * 2'
name,age,rank,foo
andi,25,120,4
budi,28,115,6
cinta,19,142,8
derry,33,121,10

You can specify at which position the new column will be using one of the options --at, --after, --before:

TODO EXAMPLE.

ADDING ROWS

TODO.

ADDING SUMMARY ROW (TOTAL, AVERAGE, ETC)

TODO.

CONVERTING TO OTHER FORMATS

To CSV

TODO.

To JSON

TODO.

To Perl data structure

TODO.

To TSV

TODO.

To YAML

TODO.

DEALING WITH NEWLINES IN CSV

TODO.

DEALING WITH NON-STANDARD CSV

The utilities allow you to set input's field separator (`--sep-char`), quote character (`--quote-char`), and escape character (`--escape-char`), so if you have semicolon as the field separator, e.g.:

name;age;rank
andi;20;staff
budi;30;manager
cinta;17;associate

and you want to sort by age:

% csv-sort-rows INPUT.CSV --sep-char ';' --by-field age

These parameters will be passed to Text::CSV's attributes with the corresponding names.

Likewise, you can customize output's field separator (`--output-sep-char`), quote character (`--output-quote-char`), and escape character (`--output-escape-char`).

FILTERING (SELECTING) COLUMNS

With csv-select-fields:

% csv-select-fields 1.csv -f age -f name
age,name
25,andi
28,budi
19,cinta
33,derry

Note that the order of the fields is as specified.

You can select multiple fields using --include-field-pat option. You can exclude fields using --exclude-field and --exclude-field-pat.

FILTERING (SELECTING) ROWS

TODO.

GETTING INFORMATION ABOUT CSV

% csv-info 1.csv
{
   "data_row_count" : 6,
   "field_count" : 3,
   "fields" : [
      "name",
      "age",
      "rank"
   ],
   "file_size" : 78,
   "header_row_count" : 0,
   "row_count" : 6
}

Listing the column names

% csv-list-field-names 1.csv
+------+-------+
| name | index |
+------+-------+
| age  | 2     |
| name | 1     |
| rank | 3     |
+------+-------+

% csv-list-field-names 1.csv --json
[
   200,
   "OK",
   [
      {
         "index" : 2,
         "name" : "age"
      },
      {
         "index" : 1,
         "name" : "name"
      },
      {
         "index" : 3,
         "name" : "rank"
      }
   ],
   {
      "stream" : 0,
      "table.fields" : [
         "name",
         "index"
      ],
      "title" : "csv-list-field-names 1.csv --json"
   }
]

MERGING CSV

TODO.

See also "SPLITTING CSV".

MODIFYING COLUMNS

TODO.

MODIFYING ROWS

TODO.

PERFORMING SET OPERATIONS WITH CSV

TODO.

SORTING COLUMNS

TODO.

SORTING ROWS

TODO.

SPLITTING CSV

TODO.

See also "MERGING CSV".

TRANSPOSING

Transposing, like in a two-dimensional matrix, means switching row and colum indices to produce a new CSV where the columns become rows and vice versa. For example:

name,age
andi,20
budi,30
cinta,17

becomes:

name,andi,budi,cinta
age,20,30,17

To do this:

% csv-transpose INPUT.CSV

HOMEPAGE

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

SOURCE

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

SEE ALSO

Acme::CPANModules::WorkingWithCSV

AUTHOR

perlancar <perlancar@cpan.org>

CONTRIBUTING

To contribute, you can send patches by email/via RT, or send pull requests on GitHub.

Most of the time, you don't need to build the distribution yourself. You can simply modify the code, then test via:

% prove -l

If you want to build the distribution (e.g. to try to install it locally on your system), you can install Dist::Zilla, Dist::Zilla::PluginBundle::Author::PERLANCAR, Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE

This software is copyright (c) 2022, 2021, 2020, 2019, 2018, 2017, 2016 by perlancar <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.

BUGS

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

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.