instructions.md

In this exercise, you'll be processing log messages with six severity levels.

Each log line is a string formatted as follows: "[<LVL>]: <MESSAGE>".

These are the different log levels:

LEVEL	LVL
Trace	TRC
Debug	DBG
Info	INF
Warning	WRN
Error	ERR
Fatal	FTL

1. Parse log level

Define a LogLevel enum that has six elements corresponding to the log levels defined above. Next, define the parse_log_level function which takes the log message as parameter and returns the enum member of its level.

parse_log_level("[INF]: File deleted")
#=> LogLevel.Info

2. Support unknown log level

Unfortunately, some log messages occasionally appear with an unknown severity. To gracefully handle these 'mysterious' log messages in the function parse_log_level, add an Unknown member to the LogLevel enum which is returned when parsing an unknown log level:

parse_log_level("[XYZ]: Overly specific, out of context message")
#=> LogLevel.Unknown

3. Convert a log message to the short format

The log level of a log line is quite verbose. To reduce the disk space needed to store the log messages, a short format is defined: "[<CODE_LEVEL>]:<MESSAGE>".

The log level codes follow a straightforward mapping:

LEVEL	CODE
Trace	0
Debug	1
Info	4
Warning	5
Error	6
Fatal	7
Unknown	42

Define the convert_to_short_log() function, which takes two parameters:

1. Log level - The Log level of the log sent. ex: LogLevel.Error.
2. Log Message - The message of type str.

convert_to_short_log(LogLevel.Error, "Stack overflow")
# => "6:Stack overflow"

4. Create an Alias

It looks like the user has created logs for LogLevel.Warn instead of LogLevel.Warning. Create an alias for LogLevel.Warning and return the new alias member in the function get_warn_alias.

This can be done on the same enum class LogLevel already defined at the top of the file. Both the LogLevels should point to same value: "WRN".

get_warn_alias()
#=> LogLevel.Warn

get_warn_alias() == LogLevel.Warning
#=> True

5. All Member Names and Values

Define the function get_members().

This function should return a list of tuples (name, value) containing all the members of the enum LogLevel.

get_members()
#=> [('Trace', 'TRC'), ('Debug', 'DBG'), ('Info', 'INF'), ('Warning', 'WRN'),
# ('Error', 'ERR'), ('Fatal', 'FTL'), ('Unknown', 'UKN')]