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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| -- Pandoc Lua filter to convert Markdown to a single <pre> HTML tag | ||
| -- with 72-character text wrapping and limited tag preservation | ||
|
|
||
| -- Add HTML escape function | ||
| local function escape_html(text) | ||
| return text:gsub("&", "&"):gsub("<", "<"):gsub(">", ">"):gsub('"', """):gsub("'", "'") | ||
| end | ||
|
|
||
| -- Custom map function to replace pandoc.utils.map | ||
| local function map(array, func) | ||
| local new_array = {} | ||
| for i, v in ipairs(array) do | ||
| new_array[i] = func(v) | ||
| end | ||
| return new_array | ||
| end | ||
|
|
||
| -- Function to calculate visible character count for links | ||
| local function visible_char_count(text) | ||
| return #text:gsub("<[^>]+>", "") | ||
| end | ||
|
|
||
| -- Function to wrap text to a specified width | ||
| local function wrap_text(text, width) | ||
| local wrapped = {} | ||
| local current_line = "" | ||
|
|
||
| for word in text:gmatch("%S+") do | ||
| local test_line = current_line ~= "" and current_line .. " " .. word or word | ||
|
|
||
| if visible_char_count(test_line) > width then | ||
| table.insert(wrapped, current_line) | ||
| current_line = word | ||
| else | ||
| current_line = test_line | ||
| end | ||
| end | ||
|
|
||
| if current_line ~= "" then | ||
| table.insert(wrapped, current_line) | ||
| end | ||
|
|
||
| return table.concat(wrapped, "\n") | ||
| end | ||
|
|
||
| -- Function to convert inline elements to plain text with preserved tags | ||
| local function inline_to_plaintext(inline) | ||
| if inline.t == "Str" then | ||
| return inline.text | ||
| elseif inline.t == "Space" then | ||
| return " " | ||
| elseif inline.t == "SoftBreak" or inline.t == "LineBreak" then | ||
| return "\n" | ||
| elseif inline.t == "Link" then | ||
| local content = pandoc.utils.stringify(inline.content) | ||
| return string.format("<a href='%s'>%s</a>", inline.target, content) | ||
| elseif inline.t == "Image" then | ||
| local alt_text = pandoc.utils.stringify(inline.caption) | ||
| return string.format("<img src='%s' alt='%s'>", inline.src, alt_text) | ||
| else | ||
| return "" | ||
| end | ||
| end | ||
|
|
||
| -- Function to process block elements | ||
| local function block_to_plaintext(block) | ||
| if block.t == "Para" or block.t == "Plain" then | ||
| local text = table.concat(map(block.content, inline_to_plaintext)) | ||
| return wrap_text(text, 72) | ||
| elseif block.t == "Figure" then | ||
| local image = block.content[1] -- The first element is usually the image | ||
| local caption = pandoc.utils.stringify(block.caption) | ||
| if image and image.t == "Plain" and image.content[1].t == "Image" then | ||
| local img = image.content[1] | ||
| local alt_text = pandoc.utils.stringify(img.caption) | ||
| return string.format( | ||
| "<figure><img src='%s' alt='%s'><figcaption>%s</figcaption></figure>", | ||
| img.src, | ||
| alt_text, | ||
| caption | ||
| ) | ||
| end | ||
| elseif block.t == "Header" then | ||
| local level = string.rep("#", block.level) | ||
| local text = table.concat(map(block.content, inline_to_plaintext)) | ||
| return wrap_text(level .. " " .. text, 72) | ||
| elseif block.t == "BulletList" then | ||
| local items = {} | ||
| for _, item in ipairs(block.content) do | ||
| -- Join the item contents with newlines between blocks | ||
| local item_text = table.concat(map(item, block_to_plaintext), "\n") | ||
| table.insert(items, "- " .. item_text:gsub("\n", "\n ")) -- Indent continued lines | ||
| end | ||
| return table.concat(items, "\n") | ||
| elseif block.t == "OrderedList" then | ||
| local items = {} | ||
| for i, item in ipairs(block.content) do | ||
| -- Join the item contents with newlines between blocks | ||
| local item_text = table.concat(map(item, block_to_plaintext), "\n") | ||
| -- Calculate padding for alignment of continued lines | ||
| local number_width = #tostring(i) + 2 -- accounts for number and ". " | ||
| local padding = string.rep(" ", number_width) | ||
| -- Add the numbered item and indent continued lines | ||
| table.insert(items, string.format("%d. %s", i, item_text:gsub("\n", "\n" .. padding))) | ||
| end | ||
| return table.concat(items, "\n") | ||
| elseif block.t == "BlockQuote" then | ||
| local text = table.concat(map(block.content, block_to_plaintext)) | ||
| return wrap_text("> " .. text, 72) | ||
| elseif block.t == "HorizontalRule" then | ||
| return string.rep("-", 72) | ||
| elseif block.t == "Table" then | ||
| return wrap_text("[Table content omitted for plaintext format]", 72) | ||
| else | ||
| return "" | ||
| end | ||
| end | ||
|
|
||
| -- Function to center text within 72 characters | ||
| local function center_text(text, width) | ||
| local padding_length = math.floor((width - #text) / 2) | ||
| return string.rep(" ", padding_length) .. text | ||
| end | ||
|
|
||
| -- Main Pandoc filter | ||
| function Pandoc(doc) | ||
| local all_text = {} | ||
|
|
||
| local title = doc.meta.title and pandoc.utils.stringify(doc.meta.title) or "" | ||
| if title ~= "" then | ||
| table.insert(all_text, center_text(title, 72)) | ||
| end | ||
|
|
||
| for _, block in ipairs(doc.blocks) do | ||
| local block_text = block_to_plaintext(block) | ||
| if block_text ~= "" then | ||
| table.insert(all_text, block_text) | ||
| end | ||
| end | ||
| local output = "<pre>" .. table.concat(all_text, "\n\n") .. "</pre>" | ||
| return pandoc.Pandoc({ pandoc.RawBlock("html", output) }, doc.meta) | ||
| end |
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