ACF Libraries

Because of using lua, a very small language, the need arises to build everything from scratch. This can lead to some confusion, apprehension, or just feeling overwhelmed. Here is documentation on what we have now in the form of libraries and common functions. We hope to build some more and use this information to get the juices flowing in regard to ACF.

Some of these are lua libs or ones written for ACF. We are also using as a standard the lposix library which is documented here LPOSIX

Generic Libraries (acf-lib)

apk.lua

Functions to load/unload apk packages

delete - Deletes a package
install - Installs a package
version - Checks a package's installed version

date.lua

Date and time functions To be used with os.time() and os.date()

date_to_seconds - Takes a date table and converts it to seconds from 1970
seconds_to_date - Takes table of seconds values and converts to a date sorted smallest to largest
string_to_table
date_diff - Takes two values of seconds and gives back the difference
num_month_name - Month number to name of month
num_month_name_abr - Month number to abr of month
name_month_num - Month name to number
abr_month_num - Month abbreviation to number
num_dow_name - Day of Week number to name
num_dow_name_abr - Day of week number to abbreviation
name_dow_num - Day of Week full name to number
abr_dow_num - Day of week abbreviation to number
what_tz - Checks to see what timezone the box is set to; /etc/TZ
change_tz - Changes the timezone
- Tables are included with this information
  - Timezones
  - Days of Week
  - Months of the Year

format.lua

Used to format tables and strings

dostounix - Converts DOS line endings to Unix
escapemagiccharacters - Escape Lua magic characters
escapespecialcharacters - Escape shell special characters
parse_lines - Takes out the blank and commented lines
parse_linesandwords - Removes blanks and comments, and parses each line for words
parse_configfile - Parses a config file for name/value pairs
search_replace - Goes through a table of lines to search and replace
search_for_lines - Goes through a file or table of lines and returns a table of matching lines
cap_begin_word - Capitalizes beginning of words
string_to_table - Takes a delimited string and turns it into a table
expand_bash_syntax_vars - Takes a string and expands any ${...} constructs with the Lua variable
replace_line - Removes the indicated line from a string and replaces it
insert_line - Inserts a new line at the indicated location in a string
get_line - Returns the specified line by number
opts_to_table - Searches an option string for separate options and puts them in a table
table_to_opts - Goes through an options table and creates the option string
update_ini_file - Set a value in a particular ini section
parse_ini_file - Read a value / values from an ini file
get_ini_section - Read an entire section from an ini file
set_ini_section - Set an entire section in an ini file
get_ini_entry - Get an entry value from an ini file, accounting for parent sections and variables

fs.lua

Used for various filesystem specific functions

is_dir - Test if the path is a directory
is_file - Test if the path is a file
is_link - Test if the path is a link
create_directory - Creates a directory if it doesn't exist, including the parent dirs
remove_directory - Deletes a directory along with its contents
create_file - Creates a blank file (and the directory if necessary)
copy_properties - Copies the permissions and ownership of one file to another
copy_file - Copies a file to a directory or new filename (creating the directory if necessary)
move_file - Moves a file to a directory or new filename (creating the directory if necessary)
read_file / read_file_as_array - Reads a file as a string / array
write_file - Replaces contents of a file
write_line_file - Appends lines to a file
find_files_as_array - Returns an array of files under "where" that match "what" (a Lua pattern)
find - Give a path and a search string and iterate over matching files
stat - Does almost the same as posix.stat, but instead it writes the output human readable

html.lua

Used to generate HTML code.

cookie.set - Creates a cookie
cookie.unset - Clears a cookie
html_escape - Escapes HTML encoded strings
entity - Outputs tags such as h1, h2, p, etc.
link - Creates a link tag
Form setup functions - Create form tags
- form.text
- form.longtext
- form.password
- form.hidden
- form.submit
- form.action
- form.file
- form.image
- form.select
- form.checkbox
- form.start
- form.stop

processinfo.lua

Manages processes

package_version - Returns the version of an apk package
process_autostart - Returns a string describing run level of a process
read_initrunlevels - Returns all processes in all run levels
add_runlevels - Add a process to a list of run levels
delete_runlevels - Remove a process from a list of run levels
daemoncontrol - Start/Stop/Restart/... a process (calls /etc/init.d/service)
pidof - Find the process ID of a running program

validator.lua

This contains multiple different functions that each will validate input in there own way.

is_string - Tests if a variable is of type string
is_boolean - Tests if a variable is of type boolean
is_number - Tests if a variable is of type number
is_ipv4 - Tests if this is a valid ipv4 address
is_partial_ipv4 - Tests if this is part of a valid ipv4 address
is_mac - Tests to see if this is a valid mac address
is_integer - Tests to see if a string contains an integer
is_integer_in_range - Tests to see if a string contains an integer in a given range
is_port - Tests to see if a string contains an integer in the IP port range
is_valid_filename - Tests to see if a string is a valid filename and (optionally) located in a specified path