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Utility Functions

A library of general Lua utility functions.

Functions

copy_table

utility_functions.copy_table(t, to_table, overwrite)

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If a table is passed, returns a copy, otherwise returns the passed value.

Input Type Description
t mixed
to_table (optional) table the existing top-level table to copy to if present. (Sub-tables are always copied to new tables.)
overwrite (optional) boolean if true, overwrites existing values; if false, does not copy over existing values. Default is true.
Return type Description
mixed

table_remove_first

utility_functions.table_remove_first(t, value)

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Removes the first occurrence of a value from an array table.

Input Type Description
t table
value mixed

table_is_empty

utility_functions.table_is_empty()

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Returns true if the table is an empty table. This works with both array tables and keyed tables

@ t *table

Return type Description
boolean true if the input table is empty; false if it is not empty or the input is not a table

iterate_keys

utility_functions.iterate_keys(t)

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Returns an unordered iterator for the keys in a table.

Input Type Description
t table
Return type Description
function

get_keys

utility_functions.get_keys(t)

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Returns a sorted array table of all the keys in a table.

Input Type Description
t table
Return type Description
table array table of the keys

create_lookup_table

utility_functions.create_lookup_table(t)

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Creates a value lookup table from an existing table.

Input Type Description
t table
Return type Description
table

round

utility_functions.round(num, places)

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Rounds a number to the nearest integer or the specified number of decimal places.

Input Type Description
num number
places (optional) number If specified, the number of decimal places to round to. If omitted or 0, will round to the nearest integer.
Return type Description
number

to_integer_if_whole

utility_functions.to_integer_if_whole(value)

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Takes a number and if it is an integer or whole float (eg 12 or 12.0), returns an integer. All other floats will be returned as passed.

Input Type Description
value number
Return type Description
number

calc_roman_numeral

utility_functions.calc_roman_numeral(num)

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Calculates the roman numeral for the input number. Adapted from https://exercism.org/tracks/lua/exercises/roman-numerals/solutions/Nia11 on 2022-08-13

Input Type Description
num number
Return type Description
string

calc_ordinal

utility_functions.calc_ordinal(num)

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Calculates the ordinal for the input number (e.g. 1st, 2nd, 3rd).

Input Type Description
num number
Return type Description
string

calc_alphabet

utility_functions.calc_alphabet(num)

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This returns one of the ways that Finale handles numbering things alphabetically, such as rehearsal marks or measure numbers.

This function was written to emulate the way Finale numbers saves when Autonumber is set to A, B, C… When the end of the alphabet is reached it goes to A1, B1, C1, then presumably to A2, B2, C2.

Input Type Description
num number
Return type Description
string

clamp

utility_functions.clamp(num, minimum, maximum)

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Clamps a number between two values.

Input Type Description
num number The number to clamp.
minimum number The minimum value.
maximum number The maximum value.
Return type Description
number

ltrim

utility_functions.ltrim(str)

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Removes whitespace from the start of a string.

Input Type Description
str string
Return type Description
string

rtrim

utility_functions.rtrim(str)

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Removes whitespace from the end of a string.

Input Type Description
str string
Return type Description
string

trim

utility_functions.trim(str)

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Removes whitespace from the start and end of a string.

Input Type Description
str string
Return type Description
string

call_and_rethrow

utility_functions.call_and_rethrow(levels, tryfunczzz)

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Calls a function and returns any returned values. If any errors are thrown at the level this function is called, they will be rethrown at the specified level with new level information. If the error message contains the rethrow placeholder enclosed in single quotes (see utils.rethrow_placeholder), it will be replaced with the correct function name for the new level.

The first argument must have the same name as the rethrow_placeholder, chosen for uniqueness.

@ … (any) Any arguments to be passed to the function.

Input Type Description
levels number Number of levels to rethrow.
tryfunczzz function The function to call.
Return type Description
any If no error is caught, returns the returned values from tryfunczzz

rethrow_placeholder

utility_functions.rethrow_placeholder()

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Returns the function name placeholder (enclosed in single quotes, the same as in Lua’s internal errors) used in call_and_rethrow.

Use this in error messages where the function name is variable or unknown (eg because the error is thrown up multiple levels) and needs to be replaced with the correct one at runtime by call_and_rethrow.

Return type Description
string

show_notes_dialog

utility_functions.show_notes_dialog(parent, caption, width, height)

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Displays a modal dialog with the contents of finaleplugin.RFTNotes (if present) or finaleplugin.Notes. If neither one is present, no dialog is shown.

Input Type Description
parent FCResourceWindow The parent window (if any) that is opening this dialog
caption string The caption for the dialog. Defaults to plugin name and version.
width number The width in pixels of the edit control. Defaults to 500.
height number The height inpixels of the edit control. Defaults to 350.

win_mac

utility_functions.win_mac(windows_value, mac_value)

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Returns the winval or the macval depending on which operating system the script is running on.

Input Type Description
windows_value any The Windows value to return
mac_value any The macOS value to return
Return type Description
any The windows_value or mac_value based on finenv.UI()IsOnWindows()

split_file_path

utility_functions.split_file_path(full_path)

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Splits a file path into folder, file name, and extension.

Input Type Description
full_path string The full file path in a Lua string.
Return type Description
string the folder path always including the final delimeter slash (macOS) or backslash (Windows). This may be an empty string.
string the filename without its extension
string the extension including its leading “.” or an empty string if no extension.

eachfile

utility_functions.eachfile(directory_path)

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Iterates a file path using lfs and feeds each directory and file name to a function. The directory names fed to the iterator function always contain path delimeters at the end. Both directory and file names are encoded utf8 on all platforms.

The following are skipped.

  • “.” and “..”
  • any file name starting withn “._” (These are macOS resource forks and can be seen on Windows as well when searching a macOS shared drive.)

Generates a runtime error for plugin versions before RGP Lua 0.68.

@ [recursive)] (boolean) true if subdirectories should always be searched. Defaults to false.

Input Type Description
directory_path string the directory path to search, encoded utf8.
Return type Description
function iterator function to be used in for loop.

parse_codepoint

utility_functions.parse_codepoint(codepoint_string)

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Returns a Unicode codepoint as a number.

Input Type Description
codepoint_string string A string in the form “U+FFFF” representing the codepoint
Return type Description
number the codepoint as a number

format_codepoint

utility_functions.format_codepoint(codepoint)

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Formats a Unicode codepoint into a string like “U+FFFF”

Input Type Description
codepoint number A string in the form “U+FFFF” representing the codepoint
Return type Description
number the codepoint as a number
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