Changelog

num_discussants and weekday columns have been added to a tibble object created by read_mbox() function.
Now the returned tibble object is automatically arranged by date column in the increasing order.

Non-ASCII decoding issue in the subject line has been resolved; you will no longer see <environment> for any non-ASCII subjects (thanks @carlmcqueen, #1).

A functionality of saving an mbox file object as an Rda file in both read_mbox() and merge_mbox_all() has been replaced with saving it as an RDS.
Some parameter names has changed to better reflect their usage in both read_mbox() and merge_mbox_all() functions (e.g., from file to mbox; and from out to file.
New variables (i.e., columns) have been added to a returned mbox tibble data_frame object: message_ID; in_reply_to; and references. (Those are commonly used entries in mailing systems like Mailman).
Underlying Python script now returns an mbox file name when an error occurs. Sometimes, a new line starting with non-escaped ‘From’ in middle of message body causes an error; this does not have to do with this mboxr package; users have to manually modify their original mbox files by replacing a new line starting with ‘From’ with ‘>From’ found in the middle of message body.

Underlying Python code has been modified to address some critical issues that has caused errors when parsing “From,” and “To” variables; this change will resolve any unexpected stops in read_mbox() and merge_mbox_all() functions.
read_mbox() and merge_mbox_all() no longer saves an output as a CSV file since CSV format is not sufficient for handling a large amount of data and can even cause some issues; Rda file format is now supported instead.
“cc” variable has newly been added to a returned tibble object for an mbox file.
“date” variable is now automatically converted into lubridate::as_datetime() object with the default timezone as UTC.

A new function merge_mbox_all() is added for merging all available mbox files in the current active directory into one mbox file as a tibble object.

mboxr (development version) Unreleased