Changes in version 2.1.0.900                      

This is the development version. Changes from the previous version are
identified below.

  - Function improvement: standardize (and by extension, harmonize) runs
    check_key internally before attempting to standardize data with that
    key
  - Function modification: check_key now rejects "source" as a
    user-specified "tidy_name" in the data key. Necessary to reserve
    "source" for storing the file name
  - Test addition: adding unit tests for check_key inputs

                 Changes in version 2.1.0 (2025-09-02)                  

  - Function fix: standardize warning message for columns found in key
    but not data is more succinct
  - Test update: unit test update for ggplot2 version 4.0.0

                 Changes in version 2.0.0 (2025-03-26)                  

There are no ERRORs, WARNINGs, or NOTEs returned by devtools::check().
Changes from the preceding version are as follows:

  - Removed function: make_json. The most critical dependency of this
    function is being archived and a suitable replacement cannot be
    found. Consider making a simple CSV of information rather than a
    JSON
  - New function: check_key makes sure a column key is properly
    formatted to work with ltertools::harmonize and removes rows where
    no "tidy_name" is specified
  - New function: standardize standarizes a single dataset (from a list)
    with the provided key object
  - Improvement: harmonize now runs in approximately half the time for
    large (i.e., >5 MB) raw data files. No change to function inputs or
    outputs, just increased efficiency

                 Changes in version 1.2.0 (2025-02-21)                  

There are no ERRORs, WARNINGs, or NOTEs returned by devtools::check().
Changes from the preceding version are as follows:

  - New function: expand_key generates rows for a column key for only
    raw data files that are not already in an existing key or in an
    existing harmonized data table

                 Changes in version 1.1.0 (2024-09-20)                  

There are no ERRORs, WARNINGs, or NOTEs returned by devtools::check().
Changes from the preceding version are as follows:

  - New function: make_json creates a JSON containing name/value pairs
    from a named vector. Optionally adds the JSON file name to the
    'gitignore' (if one can be found in the working directory)
  - New function: solar_day_info identifies sunrise, sunset, solar noon,
    and day length for all dates within a user-specified range at
    particular coordinates
  - Function update: harmonize now includes new defensive warning/error
    checks with informative messages for likely sources of error
  - Unit tests added for all functions currently in package. Likely
    limited impact on users except better adherence to best practice
    will make for a stronger package in the long run

                 Changes in version 1.0.0 (2024-02-23)                  

There are no ERRORs, WARNINGs, or NOTEs returned by devtools::check().
This is the first version of ltertools.

  - New function: read -- reads in all data files in a particular folder
    and stores them in a list
  - New function: begin_key -- creates the start of a "column key" for
    data harmonization
  - New function: harmonize -- performs column key-based harmonization
    of raw data
  - New function: cv -- calculates coefficient of variation for a vector
    of numbers
  - New function: convert_temp -- converts temperature values from one
    specified unit to another
  - New dataset: lter_sites -- includes primary habitat,
    latitude/longitude coordinates, and funding start/end years for
    every site currently in the network
  - New function: site_timeline -- creates a ggplot2-style timeline of
    all sites that meet the user-specified criteria (for site code
    and/or habitat)