add _extensions

2026-05-21 13:37:53 +08:00
parent 6a9a5fc90e
commit 61bd0bea2f
252 changed files with 33972 additions and 1 deletions
@@ -0,0 +1,180 @@
+-- Prepare LaTeX headers so quotation marks render correctly in the PDF body
+-- while keeping proper Unicode text in PDF bookmarks.
+
+--- Copyright: © 2025–Present Tom Ben
+--- License: MIT License
+
+local function format_is(name)
+    return FORMAT:match(name) ~= nil
+end
+
+local function to_macro_block(inlines)
+    return pandoc.walk_block(pandoc.Plain(inlines), {
+        Quoted = function(el)
+            local opening, closing
+            if el.quotetype == "SingleQuote" then
+                opening = pandoc.RawInline('latex', "`")
+                closing = pandoc.RawInline('latex', "'")
+            else
+                opening = pandoc.RawInline('latex', "``")
+                closing = pandoc.RawInline('latex', "''")
+            end
+
+            local result = pandoc.Inlines { opening }
+            for _, inline in ipairs(el.content) do
+                result:insert(inline)
+            end
+            result:insert(closing)
+            return result
+        end
+    })
+end
+
+local function to_unicode_block(inlines)
+    return pandoc.walk_block(pandoc.Plain(inlines), {
+        Quoted = function(el)
+            local opening, closing
+            if el.quotetype == "SingleQuote" then
+                opening, closing = '‘', '’'
+            else
+                opening, closing = '“', '”'
+            end
+
+            local result = pandoc.Inlines { pandoc.Str(opening) }
+            for _, inline in ipairs(el.content) do
+                result:insert(inline)
+            end
+            result:insert(pandoc.Str(closing))
+            return result
+        end,
+        Str = function(el)
+            -- Replace guillemets with curly quotes for PDF bookmarks
+            local text = el.text
+            text = text:gsub('«', '“')
+            text = text:gsub('»', '”')
+            text = text:gsub('‹', '‘')
+            text = text:gsub('›', '’')
+            if text ~= el.text then
+                return pandoc.Str(text)
+            end
+            return el
+        end
+    })
+end
+
+function Header(header)
+    if not format_is('latex') then
+        return header
+    end
+
+    local attr = header.attr
+    local macro_block = to_macro_block(header.content)
+    local unicode_block = to_unicode_block(header.content)
+
+    local latex_doc = pandoc.Pandoc({ macro_block }, pandoc.Meta {})
+    local latex_body = pandoc.write(latex_doc, 'latex')
+        :gsub('%s+$', '')
+        :gsub('\n', ' ')
+    local bookmark_text = pandoc.utils.stringify(unicode_block)
+        :gsub('\n', ' ')
+
+    attr.attributes['data-tex-body'] = latex_body
+    attr.attributes['data-bookmark'] = bookmark_text
+
+    return header
+end
+
+local latex_heading_levels = {
+    "section",
+    "subsection",
+    "subsubsection",
+    "paragraph",
+    "subparagraph",
+    "subparagraph"
+}
+
+local function escape_tex_argument(text)
+    local map = {
+        ['\\'] = '\\\\',
+        ['{'] = '\\{',
+        ['}'] = '\\}',
+        ['%'] = '\\%',
+        ['#'] = '\\#',
+        ['&'] = '\\&',
+        ['_'] = '\\_',
+        ['^'] = '\\^{}',
+        ['~'] = '\\~{}'
+    }
+    return text:gsub('[\\%%#&_{}%^~]', map)
+end
+
+local function heading_to_raw(header)
+    local tex_body = header.attr.attributes['data-tex-body']
+    if not tex_body then
+        return nil
+    end
+
+    local bookmark = header.attr.attributes['data-bookmark'] or pandoc.utils.stringify(header)
+    header.attr.attributes['data-tex-body'] = nil
+    header.attr.attributes['data-bookmark'] = nil
+    local short_attr = header.attr.attributes['short-title'] or header.attr.attributes['short']
+    if short_attr and short_attr ~= '' then
+        bookmark = short_attr
+    end
+    bookmark = tostring(bookmark):gsub('\n', ' ')
+    local level_index = math.min(header.level, #latex_heading_levels)
+    local command = latex_heading_levels[level_index]
+
+    local classes = header.attr.classes or {}
+    local unnumbered = false
+    for _, class in ipairs(classes) do
+        if class == 'unnumbered' then
+            unnumbered = true
+            break
+        end
+    end
+
+    local number_attr = header.attr.attributes['number']
+    if number_attr == 'no' or number_attr == 'false' or number_attr == '0' then
+        unnumbered = true
+    end
+
+    local star = unnumbered and '*' or ''
+    local bookmark_escaped = escape_tex_argument(bookmark)
+    local texorpdfstring = '\\texorpdfstring{' .. tex_body .. '}{' .. bookmark_escaped .. '}'
+    local pieces = { '\\' .. command .. star .. '{' .. texorpdfstring .. '}' }
+
+    local identifier = header.attr.identifier
+    if identifier and identifier ~= '' then
+        table.insert(pieces, '\\label{' .. identifier .. '}')
+    end
+
+    if unnumbered then
+        table.insert(pieces, '\\addcontentsline{toc}{' .. command .. '}{' .. bookmark_escaped .. '}')
+    end
+
+    return pandoc.RawBlock('latex', table.concat(pieces, '') .. '\n')
+end
+
+function Pandoc(doc)
+    if not format_is('latex') then
+        return doc
+    end
+
+    local blocks = pandoc.List:new()
+    for _, block in ipairs(doc.blocks) do
+        if block.t == 'Header' then
+            blocks:insert(heading_to_raw(block) or block)
+        else
+            blocks:insert(block)
+        end
+    end
+
+    doc.blocks = blocks
+    return doc
+end
+
+return {
+    { Header = Header },
+    { Pandoc = Pandoc }
+}