43 lines
1.3 KiB
Lua
43 lines
1.3 KiB
Lua
-- custom-toc.lua
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-- This filter builds a custom TOC without images in the link text,
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-- leaving the actual header content (with images) untouched.
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-- Helper function: remove all image inlines from a list of inlines.
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local function remove_images(inlines)
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local result = {}
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for _, item in ipairs(inlines) do
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if item.t ~= "Image" then
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table.insert(result, item)
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end
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end
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return result
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end
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-- Build a bullet list representing the table of contents.
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local function build_toc(doc)
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local toc_items = {}
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for _, block in ipairs(doc.blocks) do
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if block.t == "Header" then
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-- Remove images from the header content to use for the TOC.
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local clean_inlines = remove_images(block.content)
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local header_text = pandoc.utils.stringify(clean_inlines)
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if header_text ~= "" then
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-- Create a link using the cleaned inlines and the header’s identifier.
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local link = pandoc.Link(clean_inlines, "#" .. block.identifier)
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table.insert(toc_items, { link })
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end
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end
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end
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return pandoc.BulletList(toc_items)
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end
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-- The Pandoc function runs after the document is fully constructed.
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function Pandoc(doc)
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-- Build the custom TOC.
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local toc = build_toc(doc)
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-- Insert the TOC at the very beginning of the document.
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table.insert(doc.blocks, 1, toc)
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return doc
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end
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