itte/examples/gordon/folia.lua

80 lines
2.4 KiB
Lua

local util = require("itteutil")
-- Default settings
local folia = {
foils_dir = "",
debug = false,
}
util.docs.get_foils = [[ (directory_str)
Given the full path to a directory of foils, return the foil contents as a
table.
]]
function folia.get_foils(str)
local foil_list_str = io.popen("ls " .. str)
local foils = {}
if foil_list_str then
local foil_list = util.split_str(foil_list_str:read("*a"))
for i = 1, #foil_list do
local key = string.gsub(foil_list[i], ".lua", "")
local func, err = loadfile(str .. "/" .. foil_list[i])
if func then
func()
foils[key] = grammar
end
end
-- Unset global variables
func = nil
grammar = nil
end
return foils
end
util.docs.output = [[ (key_str)
Given a foil name or foils table key, output a random expanded string.
]]
function folia.output(key)
local foils = folia.get_foils(folia.foils_dir)
if table.concat(util.table_keys(foils), "") == "" then
util.debug("output", "Error: cannot retrieve foils." ..
" Please make sure the full directory path is correct.", folia.debug)
do return end
elseif not util.has_key(foils, key) then
util.debug("output", "Error: the key `" .. key ..
"` is not in the foils table.", folia.debug)
do return end
elseif not util.has_key(foils[key], "origin") then
util.debug("output", "Error: no origin found in the foil.", folia.debug)
do return end
elseif foils[key]["origin"] == {} then
util.debug("output", "Error: empty origin.", folia.debug)
do return end
end
local output_str = util.pick(foils[key]["origin"])[1]
local pattern = "#(%w+)#"
util.debug("output", "level 1: " .. output_str, folia.debug)
-- Check for expansion objects and replace them until none are found
while string.find(output_str, pattern) ~= nil do
local hash = output_str:sub(string.find(output_str, pattern))
local obj = hash:sub(2, #hash - 1)
-- Check the object key is in the foil grammar, and replace one instance
-- at a time.
if util.has_key(foils[key], obj) then
local expand_str = util.pick(foils[key][obj])[1]
output_str = string.gsub(output_str, hash, expand_str, 1)
util.debug("output", "level n: " .. output_str, folia.debug)
-- If the object key is not in the grammar, replace references with a
-- placeholder.
else
output_str = string.gsub(output_str, hash, "[" .. obj .. "]")
end
end
return output_str
end
return folia