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lib/App/CSVUtils/csv_mix_formulas.pm  view on Meta::CPAN

 csv_mix_formulas(%args) -> [$status_code, $reason, $payload, \%result_meta]

Mix several formulasE<sol>recipes (lists of ingredients and their weightsE<sol>volumes) into one, and output the combined formula.

Each formula is a CSV comprised of at least two fields. The first field (by
default literally the first field, but can also be specified using
C<--ingredient-field>) is assumed to contain the name of ingredients. The second
field (by default literally the second field, but can also be specified using
C<--weight-field>) is assumed to contain the weight of ingredients. A percent
form is recognized and will be converted to its decimal form (e.g. "60%" or
"60.0 %" will become 0.6).

Example, mixing this CSV:

 ingredient,%weight,extra-field1,extra-field2
 water,80,foo,bar
 sugar,15,foo,bar
 citric acid,0.3,foo,bar
 strawberry syrup,4.7,foo,bar

and this:

 ingredient,%weight,extra-field1,extra-field2,extra-field3
 lemon syrup,5.75,bar,baz,qux
 citric acid,0.25,bar,baz,qux
 sugar,14,bar,baz,qux
 water,80,bar,baz,qux

will result in the following CSV. Note: 1) for the header, except for the first
two fields which are the ingredient name and weight which will contain the mixed
formula, the other fields will simply collect values from all the CSV files. 2)
for sorting order: decreasing weight then by name.

 ingredient,%weight,extra-field1,extra-field2,extra-field3
 water,80,foo,bar,qux
 sugar,14.5,foor,bar,qux
 lemon syrup,2.875,bar,baz,qux
 strawberry syrup,2.35,foo,bar,
 citric acid,0.275,foo,bar,qux

Keywords: compositions, mixture, combine

This function is not exported.

Arguments ('*' denotes required arguments):

=over 4

=item * B<ingredient_field> => I<str>

Specify field which contain the ingredient names.

=item * B<inplace> => I<true>

Output to the same file as input.

Normally, you output to a different file than input. If you try to output to the
same file (C<-o INPUT.csv -O>) you will clobber the input file; thus the utility
prevents you from doing it. However, with this C<--inplace> option, you can
output to the same file. Like perl's C<-i> option, this will first output to a
temporary file in the same directory as the input file then rename to the final
file at the end. You cannot specify output file (C<-o>) when using this option,
but you can specify backup extension with C<-b> option.

Some caveats:

=over

=item * if input file is a symbolic link, it will be replaced with a regular file;

=item * renaming (implemented using C<rename()>) can fail if input filename is too long;

=item * value specified in C<-b> is currently not checked for acceptable characters;

=item * things can also fail if permissions are restrictive;

=back

=item * B<inplace_backup_ext> => I<str> (default: "")

Extension to add for backup of input file.

In inplace mode (C<--inplace>), if this option is set to a non-empty string, will
rename the input file using this extension as a backup. The old existing backup
will be overwritten, if any.

=item * B<input_escape_char> => I<str>

Specify character to escape value in field in input CSV, will be passed to Text::CSV_XS.

Defaults to C<\\> (backslash). Overrides C<--input-tsv> option.

=item * B<input_filenames> => I<array[filename]> (default: ["-"])

Input CSV files.

Use C<-> to read from stdin.

Encoding of input file is assumed to be UTF-8.

=item * B<input_header> => I<bool> (default: 1)

Specify whether input CSV has a header row.

By default, the first row of the input CSV will be assumed to contain field
names (and the second row contains the first data row). When you declare that
input CSV does not have header row (C<--no-input-header>), the first row of the
CSV is assumed to contain the first data row. Fields will be named C<field1>,
C<field2>, and so on.

=item * B<input_quote_char> => I<str>

Specify field quote character in input CSV, will be passed to Text::CSV_XS.

Defaults to C<"> (double quote). Overrides C<--input-tsv> option.

=item * B<input_sep_char> => I<str>

Specify field separator character in input CSV, will be passed to Text::CSV_XS.

Defaults to C<,> (comma). Overrides C<--input-tsv> option.

=item * B<input_tsv> => I<true>

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

Overriden by C<--input-sep-char>, C<--input-quote-char>, C<--input-escape-char>
options. If one of those options is specified, then C<--input-tsv> will be
ignored.

=item * B<output_always_quote> => I<bool> (default: 0)

Whether to always quote values.

When set to false (the default), values are quoted only when necessary:

 field1,field2,"field three contains comma (,)",field4

When set to true, then all values will be quoted:

 "field1","field2","field three contains comma (,)","field4"

=item * B<output_escape_char> => I<str>