Re-add literate supportg

runtime/plugins/literate/README.md

@@ -0,0 +1,5 @@
+# Literate Micro
+
+Support for reading `.lit` files from [zyedidia/Literate](https://github.com/zyedidia/Literate).
+
+This plugin will automatically detect the filetype and highlight the correct language inside the code blocks.

runtime/plugins/literate/literate.lua

@@ -0,0 +1,53 @@
+VERSION = "1.0.0"
+
+function startswith(str, start)
+   return string.sub(str,1,string.len(start))==start
+end
+
+function endswith(str, endStr)
+   return endStr=='' or string.sub(str,-string.len(endStr))==endStr
+end
+
+function split(string, sep)
+        local sep, fields = sep or ":", {}
+        local pattern = string.format("([^%s]+)", sep)
+        string:gsub(pattern, function(c) fields[#fields+1] = c end)
+        return fields
+end
+
+function onViewOpen(view)
+    if not endswith(view.Buf.Path, ".lit") then
+        return
+    end
+
+    local codetype = "unknown"
+    for i=1,view.Buf.NumLines do
+        local line = view.Buf:Line(i-1)
+        if startswith(line, "@code_type") then
+            codetype = split(line, " ")[2]
+            break
+        end
+    end
+
+    local syntaxFile = ""
+    syntaxFile = syntaxFile .. "filetype: literate-" .. codetype .. "\n"
+    syntaxFile = syntaxFile .. "detect:\n"
+    syntaxFile = syntaxFile .. "    filename: \"\\\\.lit$\"\n"
+    syntaxFile = syntaxFile .. "rules:\n"
+    syntaxFile = syntaxFile .. "    - include: \"markdown\"\n"
+    syntaxFile = syntaxFile .. "    - special: \"^(@s|@title|@code_type|@comment_type|@include|@change|@change_end)\"\n"
+    syntaxFile = syntaxFile .. "    - special: \"(@add_css|@overwrite_css|@colorscheme|@compiler|@error_format|@book)\"\n"
+    syntaxFile = syntaxFile .. "    - default:\n"
+    syntaxFile = syntaxFile .. "        start: \"---.*$\"\n"
+    syntaxFile = syntaxFile .. "        end: \"---$\"\n"
+    syntaxFile = syntaxFile .. "        limit-group: \"identifier\"\n"
+    syntaxFile = syntaxFile .. "        rules:\n"
+    syntaxFile = syntaxFile .. "            - special:\n"
+    syntaxFile = syntaxFile .. "                start: \"@\\\\{\"\n"
+    syntaxFile = syntaxFile .. "                end: \"\\\\}\"\n"
+    syntaxFile = syntaxFile .. "                rules: []\n"
+    syntaxFile = syntaxFile .. "            - include: " .. codetype .. "\n"
+
+    AddRuntimeFileFromMemory("literate", "syntax", "literate.yaml", syntaxFile)
+    Reload()
+end