commit 8ee072f7d5cf41c5e75b2f50870dfba241436077
Author: Reynir Björnsson <reynir@reynir.dk>
Date:   Tue Sep 24 11:58:17 2024 +0200

    Initial commit

diff --git a/bin/dune b/bin/dune
new file mode 100644
index 0000000..6447bea
--- /dev/null
+++ b/bin/dune
@@ -0,0 +1,4 @@
+(executable
+ (public_name kortfat)
+ (name main)
+ (libraries kortfat cmarkit))
diff --git a/bin/main.ml b/bin/main.ml
new file mode 100644
index 0000000..fca6979
--- /dev/null
+++ b/bin/main.ml
@@ -0,0 +1,19 @@
+let read_markdown file =
+  let s =
+    let ic = open_in file in
+    (* XXX: probably doesn't work on Windows *)
+    let len = In_channel.length ic |> Int64.to_int in
+    Fun.protect (fun () -> really_input_string ic len)
+      ~finally:(fun () -> close_in ic)
+  in
+  Cmarkit.Doc.of_string ~file s
+
+let kortfat files =
+  let mds = List.map read_markdown files in
+  let doc = Kortfat.kortfat mds in
+  Cmarkit_commonmark.of_doc doc
+  |> print_endline
+
+let () =
+  let files = List.tl (Array.to_list Sys.argv) in
+  kortfat files
diff --git a/dune-project b/dune-project
new file mode 100644
index 0000000..f8a936b
--- /dev/null
+++ b/dune-project
@@ -0,0 +1,26 @@
+(lang dune 3.16)
+
+(name kortfat)
+
+(generate_opam_files true)
+
+(source
+ (github username/reponame))
+
+(authors "Author Name")
+
+(maintainers "Maintainer Name")
+
+(license LICENSE)
+
+(documentation https://url/to/documentation)
+
+(package
+ (name kortfat)
+ (synopsis "A short synopsis")
+ (description "A longer description")
+ (depends ocaml dune cmarkit)
+ (tags
+  (topics "to describe" your project)))
+
+; See the complete stanza docs at https://dune.readthedocs.io/en/stable/reference/dune-project/index.html
diff --git a/kortfat.opam b/kortfat.opam
new file mode 100644
index 0000000..e266be4
--- /dev/null
+++ b/kortfat.opam
@@ -0,0 +1,32 @@
+# This file is generated by dune, edit dune-project instead
+opam-version: "2.0"
+synopsis: "A short synopsis"
+description: "A longer description"
+maintainer: ["Maintainer Name"]
+authors: ["Author Name"]
+license: "LICENSE"
+tags: ["topics" "to describe" "your" "project"]
+homepage: "https://github.com/username/reponame"
+doc: "https://url/to/documentation"
+bug-reports: "https://github.com/username/reponame/issues"
+depends: [
+  "ocaml"
+  "dune" {>= "3.16"}
+  "cmarkit"
+  "odoc" {with-doc}
+]
+build: [
+  ["dune" "subst"] {dev}
+  [
+    "dune"
+    "build"
+    "-p"
+    name
+    "-j"
+    jobs
+    "@install"
+    "@runtest" {with-test}
+    "@doc" {with-doc}
+  ]
+]
+dev-repo: "git+https://github.com/username/reponame.git"
diff --git a/lib/dune b/lib/dune
new file mode 100644
index 0000000..2b0ee4f
--- /dev/null
+++ b/lib/dune
@@ -0,0 +1,3 @@
+(library
+ (name kortfat)
+ (libraries cmarkit))
diff --git a/lib/kortfat.ml b/lib/kortfat.ml
new file mode 100644
index 0000000..698a777
--- /dev/null
+++ b/lib/kortfat.ml
@@ -0,0 +1,72 @@
+module SM = Map.Make(String)
+
+let heading_to_string heading =
+  Cmarkit.Block.Heading.inline heading
+  |> Cmarkit.Inline.to_plain_text ~break_on_soft:false
+  |> List.map (String.concat "")
+  |> String.concat "\n"
+
+let aggregate t doc =
+  let rec aggregate t heading = function
+    | [] -> t
+    | Cmarkit.Block.Heading (heading, _) :: rest ->
+      let heading = heading_to_string heading in
+      let t =
+        SM.update heading
+          (function
+            | None -> Some []
+            | Some blocks -> Some blocks)
+          t
+      in
+      aggregate t heading rest
+    | block :: rest ->
+      let t =
+        SM.update heading
+          (function
+            | None ->
+              Some [ block ]
+            | Some blocks ->
+              Some (block :: blocks))
+          t
+      in
+      aggregate t heading rest
+  in
+  match Cmarkit.Doc.block doc with
+  | Cmarkit.Block.Blocks (blocks, _) ->
+    aggregate t "" blocks
+  | Cmarkit.Block.Heading (heading, _) ->
+    let heading = heading_to_string heading in
+    SM.update heading
+      (function
+        | None -> Some []
+        | Some blocks -> Some blocks)
+      t
+  | block ->
+    SM.update ""
+      (function
+        | None ->
+          Some [ block ]
+        | Some blocks ->
+          Some (block :: blocks))
+      t
+
+let kortfat docs =
+  let rev_t = List.fold_left aggregate SM.empty docs in
+  let t = SM.map List.rev rev_t in
+  let blocks =
+    SM.fold
+      (fun heading blocks acc ->
+         let heading =
+           Cmarkit.Block.Heading
+             (Cmarkit.Block.Heading.make
+                ~level:2
+                (Cmarkit.Inline.Text
+                   (heading, Cmarkit.Meta.none)),
+              Cmarkit.Meta.none)
+         in
+         heading :: blocks @ acc)
+      t
+      []
+  in
+  Cmarkit.Block.Blocks (blocks, Cmarkit.Meta.none)
+  |> Cmarkit.Doc.make