Marek S. ŁukasiewiczandGitHub
b73dadec67
When omitted, the function outputs empty string for empty table as before. The feature was motivated by the Maintenance page in v1 that showed messages instead of just empty blocks (ported over).
1.5 KiB
1.5 KiB
#meta
Implements useful template functions
-- priority: 50
-- Template API root table
template = template or {}
-- Template storage table
templates = {}
-- Iterates over a table/array and applies a function to each element,
-- concatenating the results. The last, optional argument is output for empty table
function template.each(tbl, fn, empty)
local empty = empty or ""
local result = {}
for _, item in ipairs(tbl) do
table.insert(result, fn(item))
end
if #result == 0 then
return empty
else
return table.concat(result)
end
end
-- Creates a new template function from a string template
function template.new(templateStr)
-- Preprocess: strip indentation
local lines = {}
local splitLines = string.split(templateStr, "\n")
for _, line in ipairs(splitLines) do
line = string.gsub(line, "^ ", "")
table.insert(lines, line)
end
templateStr = table.concat(lines, "\n")
return function(obj)
return spacelua.interpolate(templateStr, obj)
end
end
-- Reads a template from a page
-- Return value:
-- * The template itself
-- * The extracted frontmatter
function template.fromPage(name, raw)
local fm = index.extractFrontmatter(space.readPage(name), {
removeFrontmatterSection = true,
removeTags = true
})
local templateText = string.trimStart(fm.text)
if raw then
-- Don't actually parse this as a template, just pass it along
return function()
return templateText
end, fm.frontmatter
end
return template.new(templateText), fm.frontmatter
end