NAME

App::CSVUtils - CLI utilities related to CSV

VERSION

This document describes version 0.019 of App::CSVUtils (from Perl distribution App-CSVUtils), released on 2019-04-23.

DESCRIPTION

This distribution contains the following CLI utilities:

• csv-add-field

• csv-avg

• csv-concat

• csv-convert-to-hash

• csv-delete-field

• csv-dump

• csv-each-row

• csv-grep

• csv-list-field-names

• csv-map

• csv-munge-field

• csv-replace-newline

• csv-select-fields

• csv-select-row

• csv-sort-fields

• csv-sum

• dump-csv

FUNCTIONS

csv_add_field

Usage:

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

Add a field to CSV file.

Your Perl code (-e) will be called for each row (excluding the header row) and should return the value for the new field. $main::row is available and contains the current row, while $main::rownum contains the row number (2 means the first data row). $main::field_idxs is also available for additional information.

Field by default will be added as the last field, unless you specify one of --after (to put after a certain field), --before (to put before a certain field), or --at (to put at specific position, 1 means as the first field).

This function is not exported.

Arguments ('*' denotes required arguments):

• after => str

  Put the new field after specified field.

• at => int

  Put the new field at specific position (1 means as first field).

• before => str

  Put the new field before specified field.

• eval* => str

  Perl code to do munging.

• field* => str

  Field name.

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_avg

Usage:

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

Output a summary row which are arithmetic averages of data rows.

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

• with_data_rows => bool

  Whether to also output data rows.

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)

csv_concat

Usage:

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

Concatenate several CSV files together, collecting all the fields.

Example, concatenating this CSV:

col1,col2
1,2
3,4

and:

col2,col4
a,b
c,d
e,f

and:

col3
X
Y

will result in:

col1,col2,col4,col3
1,2,
3,4,
,a,b
,c,d
,e,f
,,,X
,,,Y

This function is not exported.

Arguments ('*' denotes required arguments):

• filenames* => array[filename]

  Input CSV files.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_convert_to_hash

Usage:

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

Return a hash of field names as keys and first row as values.

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• row_number => int (default: 2)

  Row number (e.g. 2 for first data row).

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_delete_field

Usage:

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

Delete one or more fields from CSV file.

This function is not exported.

Arguments ('*' denotes required arguments):

• fields* => array[str]

  Field names.

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_dump

Usage:

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

Dump CSV as data structure (array of array/hash).

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• hash => bool

  Provide row in $_ as hashref instead of arrayref.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_each_row

Usage:

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

Run Perl code for every row.

Examples:

• Delete user data:

  csv_each_row(
    filename => "users.csv",
    eval => "\"unlink qq(/home/data/\$_->{username}.dat)\"",
    hash => 1
  );

This is like csv_map, except result of code is not printed.

This function is not exported.

Arguments ('*' denotes required arguments):

• eval* => str

  Perl code.

• filename* => filename

  Input CSV file.

• hash => bool

  Provide row in $_ as hashref instead of arrayref.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_grep

Usage:

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

Only output row(s) where Perl expression returns true.

Examples:

• Only show rows where the amount field is divisible by 7:

  csv_grep( filename => "file.csv", eval => "\$_->{amount} % 7 ? 1:0", hash => 1);

• Only show rows where date is a Wednesday:

  csv_grep(
    filename => "file.csv",
    eval => "BEGIN { use DateTime::Format::Natural; \$parser = DateTime::Format::Natural->new } \$dt = \$parser->parse_datetime(\$_->{date}); \$dt->day_of_week == 3",
    hash => 1
  );

This is like Perl's grep performed over rows of CSV. In $_, your Perl code will find the CSV row as an arrayref (or, if you specify -H, as a hashref). $main::row is also set to the row (always as arrayref), while $main::rownum contains the row number (2 means the first data row). $main::field_idxs is also available for additional information.

Your code is then free to return true or false based on some criteria. Only rows where Perl expression returns true will be included in the result.

This function is not exported.

Arguments ('*' denotes required arguments):

• eval* => str

  Perl code.

• filename* => filename

  Input CSV file.

• hash => bool

  Provide row in $_ as hashref instead of arrayref.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_list_field_names

Usage:

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

List field names of CSV file.

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_map

Usage:

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

Return result of Perl code for every row.

Examples:

• Create SQL insert statements (escaping is left as an exercise for users):

  csv_map(
    filename => "file.csv",
    eval => "\"INSERT INTO mytable (id,amount) VALUES (\$_->{id}, \$_->{amount});\"",
    hash => 1
  );

This is like Perl's map performed over rows of CSV. In $_, your Perl code will find the CSV row as an arrayref (or, if you specify -H, as a hashref). $main::row is also set to the row (always as arrayref), while $main::rownum contains the row number (2 means the first data row). $main::field_idxs is also available for additional information.

Your code is then free to return a string based on some operation against these data. This utility will then print out the resulting string.

This function is not exported.

Arguments ('*' denotes required arguments):

• add_newline => bool (default: 1)

  Whether to make sure each string ends with newline.

• eval* => str

  Perl code.

• filename* => filename

  Input CSV file.

• hash => bool

  Provide row in $_ as hashref instead of arrayref.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_munge_field

Usage:

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

Munge a field in every row of CSV file.

Perl code (-e) will be called for each row (excluding the header row) and $_ will contain the value of the field, and the Perl code is expected to modify it. $main::row will contain the current row array and $main::rownum contains the row number (2 means the first data row). $main::field_idxs is also available for additional information.

This function is not exported.

Arguments ('*' denotes required arguments):

• eval* => str

  Perl code to do munging.

• field* => str

  Field name.

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_replace_newline

Usage:

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

Replace newlines in CSV values.

Some CSV parsers or applications cannot handle multiline CSV values. This utility can be used to convert the newline to something else. There are a few choices: replace newline with space (--with-space, the default), remove newline (--with-nothing), replace with encoded representation (--with-backslash-n), or with characters of your choice (--with 'blah').

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

• with => str (default: " ")

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)

csv_select_fields

Usage:

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

Only output selected field(s).

This function is not exported.

Arguments ('*' denotes required arguments):

• field_pat => re

  Field regex pattern to select.

• fields => array[str]

  Field names.

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_select_row

Usage:

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

Only output specified row(s).

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• row_spec* => str

  Row number (e.g. 2 for first data row), range (2-7), or comma-separated list of such (2-7,10,20-23).

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_sort_fields

Usage:

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

Sort CSV fields.

This function is not exported.

Arguments ('*' denotes required arguments):

• ci => bool

• example => str

  A comma-separated list of field names.

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• reverse => bool

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

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)

csv_sum

Usage:

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

Output a summary row which are arithmetic sums of data rows.

This function is not exported.

Arguments ('*' denotes required arguments):

• filename* => filename

  Input CSV file.

• header => bool (default: 1)

  Whether CSV has a header row.

  When you declare that CSV does not have header row (--no-header), the fields will be named field1, field2, and so on.

• tsv => bool

  Inform that input file is in TSV (tab-separated) format instead of CSV.

• with_data_rows => bool

  Whether to also output data rows.

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-CSVUtils.

SOURCE

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

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.

SEE ALSO

csvgrep.

AUTHOR

perlancar <perlancar@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2019, 2018, 2017, 2016 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::CSVUtils

perl -MCPAN -e shell
install App::CSVUtils