LaTeX format for LuaMetaTeX
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-- Three callbacks are defined in other files: stop_run in back-pdf, pre_dump in lateinit, and find_fmt_file in init
local read_tfm = font.read_tfm
local font_define = font.define
local callbacks = require'luametalatex-callbacks'
if status.ini_version then
function callbacks.define_font(name, size)
local f = read_tfm(name, size)
if not f then return end
local id = font_define(f)
lua.prepared_code[#lua.prepared_code+1] = string.format("assert(%i == font.define(font.read_tfm(%q, %i)))", id, name, size)
return id
end
else
function callbacks.define_font(name, size)
local f = read_tfm(name, size)
if not f then
tex.error(string.format("Font %q not found", name), "The requested font could't be loaded.\n\z
Are you sure that you passed the right name and\n\z
that the font is actually installed?")
return 0
end
return font.define(f)
end
end
callbacks.__freeze'define_font'
function callbacks.find_log_file(name) return name end
callbacks.__freeze'find_log_file'
-- find_data_file is not an engine callback in luametatex, so we don't __freeze it
if status.ini_version then
function unhook_expl()
callbacks.find_data_file = nil
end
function callbacks.find_data_file(name)
if name == 'ltexpl.ltx' then
name = 'luametalatex-ltexpl-hook'
end
return kpse.find_file(name, 'tex', true)
end
end
local function normal_find_data_file(name)
return kpse.find_file(name, 'tex', true)
end
function callbacks.open_data_file(name)
local find_callback = callbacks.find_data_file
local path
if find_callback then
path = find_callback(name)
else
path = kpse.find_file(name, 'tex', true)
end
if not path then return end
local open_callback = callbacks.open_data_file
if open_callback then
return open_callback(path)
end
local f = io.open(path, 'r')
return f and setmetatable({
reader = function()
local line = f:read()
return line
end,
close = function() f:close() f = nil end,
}, {
__gc = function() if f then f:close() end end,
})
end
callbacks.__freeze('open_data_file', true)
local do_terminal_input do
local function terminal_open_data_file()
local old = callbacks.open_data_file
return function()
callbacks.open_data_file = old
return {
reader = function()
texio.write_nl('term', '* ')
local line = io.stdin:read()
return line
end,
close = function() end,
}
end
end
function do_terminal_input()
local old_find = callbacks.find_data_file
function callbacks.find_data_file(name)
callbacks.find_data_file = old_find
return name
end
callbacks.open_data_file = terminal_open_data_file()
token.put_next(token.create'expandafter', token.create'relax', token.create'input', 'TERMINAL ')
token.skip_next_expanded()
end
end
local errorvalues = tex.geterrorvalues()
function callbacks.intercept_tex_error(mode, errortype)
errortype = errorvalues[errortype]
if errortype == "eof" then
tex.runlocal(function()token.put_next(token.create'tracingall')end)
do_terminal_input()
tex.runlocal(token.skip_next)
return 3
end
texio.write'.'
tex.showcontext()
if mode ~= 3 then return mode end
repeat
texio.write_nl'? '
local line = io.read()
if not line then
tex.fatalerror'End of line encountered on terminal'
end
if line == "" then return 3 end
local first = line:sub(1,1):upper()
if first == 'H' then
texio.write(tex.gethelptext() or "Sorry, I don't know how to help in this situation.\n\z
Maybe you should try asking a human?")
elseif first == 'I' then
line = line:sub(2)
tex.runlocal(function()
tex.sprint(token.scan_token(), line)
end)
return 3
elseif first == 'Q' then texio.write'OK, entering \\batchmode...\n' return 0
elseif first == 'R' then texio.write'OK, entering \\nonstopmode...\n' return 1
elseif first == 'S' then texio.write'OK, entering \\scrollmode...\n' return 2
elseif first == 'X' then return -1
else
texio.write'Type <return> to proceed, S to scroll future error messages,\
\z R to run without stopping, Q to run quietly,\
\z I to insert something,\
\z H for help, X to quit.'
end
until false
return 3
end
callbacks.__freeze'intercept_tex_error'