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-- Ensure unpack also works if pandoc was compiled against Lua 5.1
local unpack = unpack or table.unpack
local List = require 'pandoc.List'
local stringify = (require 'pandoc.utils')['stringify']
--- Set some default options
local default = {
opening = 'Dear Sir/Madam,',
closing = 'Sincerely,',
address = 'no address given'
}
--- Return a list of inlines representing a call to a latex command.
local function latex_command (command, ...)
local entry = {
pandoc.RawInline('latex', '\\' .. command),
}
for _, arg in ipairs{...} do
entry[#entry + 1] = pandoc.RawInline('latex', '{')
if type(arg) ~= 'table' then
entry[#entry + 1] = pandoc.RawInline('latex', tostring(arg))
else
List.extend(entry, arg)
end
entry[#entry + 1] = pandoc.RawInline('latex', '}')
end
return entry
end
--- Convert the given meta-value to a list of inlines
local function ensure_inlines (val)
if not val or type(val) == 'string' or type(val) == 'boolean' then
return pandoc.MetaInlines{pandoc.Str(tostring(val))}
elseif type(val) == 'table' and val.t == 'MetaInlines' then
return val
elseif type(val) == 'table' then
local res = List:new{}
for i = 1, #val do
res:extend(val[i])
res[#res + 1] = pandoc.RawInline('latex', '\\\\ ')
end
res[#res] = nil -- drop last linebreak
return pandoc.MetaInlines(res)
else
return pandoc.MetaInlines{pandoc.Str(pandoc.utils.stringify(val))}
end
end
--- Convert the given value to a MetaList
local function ensure_meta_list (val)
if not val or val.t ~= 'MetaList' then
return pandoc.MetaList{}
else
return val
end
end
--- Set supported variables as KOMA variables.
function setkomavar_commands (meta)
local set_vars = {}
local res = {}
local function set_koma_var (name, value, enable)
if value ~= nil then
res[#res + 1] = latex_command('setkomavar', name, ensure_inlines(value))
if enable then
set_vars[#set_vars + 1] = name
end
end
end
set_koma_var('fromname', meta.fromname or meta.author)
set_koma_var('fromaddress', meta.fromaddress or meta['return-address'])
set_koma_var('subject', meta.subject)
set_koma_var('title', meta.title)
set_koma_var('signature', meta.signature)
set_koma_var('customer', meta.customer)
set_koma_var('yourref', meta.yourref)
set_koma_var('myref', meta.myref)
set_koma_var('invoice', meta.invoice)
set_koma_var('place', meta.place)
set_koma_var('fromfax', meta.fromfax or meta.fax, true)
set_koma_var('fromurl', meta.fromurl or meta.url, true)
set_koma_var('fromlogo', meta.fromlogo or meta.logo, true)
set_koma_var('fromemail', meta.fromemail or meta.email, true)
set_koma_var('fromphone', meta.fromphone or meta.phone, true)
-- don't set date if date is set to `false`
if meta.date == nil or meta.date == true then
if meta['date-format'] then
set_koma_var('date', os.date(stringify(date_format)))
else
set_koma_var('date', pandoc.MetaInlines{pandoc.RawInline('latex', '\\today')})
end
elseif meta.date then
set_koma_var('date', meta.date)
end
if meta['KOMAoptions'] or #set_vars >= 1 then
res[#res + 1] = latex_command(
'KOMAoptions',
meta['KOMAoptions']
or table.concat(set_vars, '=true,') .. '=true'
)
end
return res
end
--- Bring Metadata in a form suitable for the scrlttr KOMA class
local function make_koma_metadata(meta)
local header_includes = ensure_meta_list(meta['header-includes'])
List.extend(header_includes, setkomavar_commands(meta))
local include_before = ensure_meta_list(meta['include-before'])
List.extend(
include_before,
{
pandoc.MetaInlines(
latex_command(
'begin',
'letter',
ensure_inlines(meta.address or default.address)
)
),
pandoc.MetaInlines(
latex_command('opening', meta.opening or default.opening)
),
}
)
local include_after = ensure_meta_list(meta['include-after'])
List.extend(
include_after,
{
pandoc.MetaInlines(
latex_command('closing', meta.closing or default.closing)
),
pandoc.MetaInlines(latex_command('end', 'letter')),
}
)
-- unset or reset some unwanted vars
meta.data = nil -- set via komavar 'date'
meta.title = nil -- set via komavar 'subject'
meta.indent = true -- disable parskib
-- set documentclass to scrlttr2 if it's unset
meta.documentclass = meta.documentclass or pandoc.MetaString'scrlttr2'
meta['header-includes'] = header_includes
meta['include-before'] = include_before
meta['include-after'] = include_after
return meta
end
return {
{Meta = make_koma_metadata}
}
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