luametalatex/luametalatex-callbacks.lua

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2020-07-04 06:27:30 +02:00
-- Two callbacks are defined in other files: pre_dump in lateinit and find_fmt_file in init
local read_tfm = font.read_tfm
local font_define = font.define
local callback_register = callback.register
if status.ini_version then
callback_register('define_font', function(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
callback_register('define_font', function(name, size)
local f = read_tfm(name, size)
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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
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return font.define(f)
end)
end
callback_register('find_log_file', function(name) return name end)
do
local function normal_find_data_file(name)
return kpse.find_file(name, 'tex', true)
end
if status.ini_version then
function unhook_expl()
callback_register('find_data_file', normal_find_data_file)
end
callback_register('find_data_file', function(name)
if name == 'ltexpl.ltx' then
name = 'luametalatex-ltexpl-hook'
end
return normal_find_data_file(name)
end)
else
callback_register('find_data_file', normal_find_data_file)
end
end
-- callback_register('read_data_file', function(name) error[[TODO]]return kpse.find_file(name, 'tex', true) end)
callback_register('open_data_file', function(name)
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local f = io.open(name, 'r')
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return setmetatable({
reader = function()
local line = f:read()
return line
end,
close = function()error[[1]] return f:close() end,
}, {
__gc = function()f:close()end,
})
end)
callback_register('handle_error_hook', function()
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.runtoks(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)
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-- Now overwrite the callback functionality. Our system is based on the ssumption there there are
-- no unknown callback names, just callbacks very unlikely to ever be called. That doesn't lead to
-- good error checking, but we expect this to be overwritten by LaTeX anyway.
local callback_find = callback.find
local rawset = rawset
local callbacks = setmetatable({}, {
__index = function(cbs, name)
return callback_find(name)
end,
__newindex = function(cbs, name, new)
return callback_register(name, new) or rawset(cbs, name, new)
end,
})
function callback.register(name, new)
callbacks[name] = new
end
function callback.find(name)
return callbacks[name]
end
return callbacks