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spellcheck.lua
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spellcheck.lua
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-- lua filter for spell checking: requires 'aspell'.
-- Copyright (C) 2017-2020 John MacFarlane, released under MIT license
-- pandoc.utils.stringify works on MetaValue elements since pandoc 2.1
if PANDOC_VERSION == nil then -- if pandoc_version < 2.1
error("ERROR: pandoc >= 2.1 required for spellcheck.lua filter")
end
local text = require('text')
local words = {}
local deflang
local function add_to_dict(lang, t)
if not words[lang] then
words[lang] = {}
end
if not words[lang][t] then
words[lang][t] = (words[lang][t] or 0) + 1
end
end
local function get_deflang(meta)
deflang = (meta.lang and pandoc.utils.stringify(meta.lang)) or 'en'
return {} -- eliminate meta so it doesn't get spellchecked
end
local function run_spellcheck(lang)
local keys = {}
local wordlist = words[lang]
for k,_ in pairs(wordlist) do
keys[#keys + 1] = k
end
local inp = table.concat(keys, '\n')
local outp = pandoc.pipe('aspell', {'list','-l',lang}, inp)
for w in string.gmatch(outp, "([%S]+)\n") do
io.write(w)
if lang ~= deflang then
io.write("\t[" .. lang .. "]")
end
io.write("\n")
end
end
local function results(el)
pandoc.walk_block(pandoc.Div(el.blocks), {Str = function(e) add_to_dict(deflang, e.text) end})
for lang,v in pairs(words) do
run_spellcheck(lang)
end
os.exit(0)
end
local function checkstr(el)
add_to_dict(deflang, el.text)
end
local function checkspan(el)
local lang = el.attributes.lang
if not lang then return nil end
pandoc.walk_inline(el, {Str = function(e) add_to_dict(lang, e.text) end})
return {} -- remove span, so it doesn't get checked again
end
local function checkdiv(el)
local lang = el.attributes.lang
if not lang then return nil end
pandoc.walk_block(el, {Str = function(e) add_to_dict(lang, e.text) end})
return {} -- remove div, so it doesn't get checked again
end
return {{Meta = get_deflang},
{Div = checkdiv, Span = checkspan},
{Str = function(e) add_to_dict(deflang, e.text) end, Pandoc = results}}