1 files changed, 73 insertions, 0 deletions
diff --git a/src/helper/parse-header.ts b/src/helper/parse-header.ts
new file mode 100644
index 0000000..92e0e52
--- /dev/null
+++ b/src/helper/parse-header.ts
@@ -0,0 +1,73 @@
+
+
+
+/*** EXPORT ------------------------------------------- ***/
+
+export interface DocumentMeta {
+  abstract: string;
+  category: string;
+  date: string;
+  document: string;
+  title: string;
+}
+
+export default (input: string): DocumentMeta => {
+  /*** NOTE
+       This is extremely fragile, the source document must be formatted
+       specifically. This is my blog so who cares? ***/
+
+  const lines = input.split("\n");
+
+  /*** extract document ID ***/
+  const documentMatch = lines[1]?.match(/^Document:\s+(\S+)/);
+  const document = documentMatch?.[1] ?? "";
+
+  /*** extract category ***/
+  const categoryMatch = lines[2]?.match(/^Category:\s+(\S+)/);
+  const category = categoryMatch?.[1] ?? "";
+
+  /*** extract date ***/
+  const dateMatch = lines[2]?.match(/\d{4}.\d{2}.\d{2}/);
+  const date = dateMatch?.[0] ?? "";
+
+  /*** find title (first non-empty line after the header block) ***/
+  let title = "";
+  let titleIndex = -1;
+
+  for (let i = 3; i < lines.length; i++) {
+    const trimmed = lines[i].trim();
+
+    if (trimmed && trimmed !== "Abstract") {
+      title = trimmed;
+      titleIndex = i;
+      break;
+    }
+  }
+
+  /*** extract abstract (content between "Abstract" and "Body") ***/
+  let abstract = "";
+  let inAbstract = false;
+
+  for (let i = titleIndex + 1; i < lines.length; i++) {
+    const trimmed = lines[i].trim();
+
+    if (trimmed === "Abstract") {
+      inAbstract = true;
+      continue;
+    }
+
+    if (trimmed === "Body")
+      break;
+
+    if (inAbstract && trimmed)
+      abstract += (abstract ? " " : "") + trimmed;
+  }
+
+  return {
+    abstract,
+    category,
+    date,
+    document,
+    title
+  };
+}