diff --git a/deno.lock b/deno.lock
index 1eaa719..4692111 100644
--- a/deno.lock
+++ b/deno.lock
@@ -410,6 +410,9 @@
     "https://deno.land/x/jszip@0.11.0/mod.ts": "5661ddc18e9ac9c07e3c5d2483bc912a7022b6af0d784bb7b05035973e640ba1",
     "https://deno.land/x/jszip@0.11.0/types.ts": "1528d1279fbb64dd118c371331c641a3a5eff2b594336fb38a7659cf4c53b2d1",
     "https://deno.land/x/promise_object@v0.10.0/index.ts": "095e9fed1c0948110c8ded200814b051ac105ec2315b7ffc2c8ab51250d5a82b",
+    "https://deno.land/x/typed_regex@0.2.0/api_types.ts": "27a3f41894244da95b60646962231a3b02c4ed55bf7042747c737869fe3d4574",
+    "https://deno.land/x/typed_regex@0.2.0/mod.ts": "2a51f6fca3f6cabe28d420680c4bc6609704e3cc833ba987efe2c44c911330bb",
+    "https://deno.land/x/typed_regex@0.2.0/type_parser.ts": "a265790f94234a5338c7854af3794bcb012015f7c3e1c091ebf7b160b1627d31",
     "https://deno.land/x/which@0.3.0/mod.ts": "3e10d07953c14e4ddc809742a3447cef14202cdfe9be6678a1dfc8769c4487e6",
     "https://deno.land/x/zod@v3.20.5/ZodError.ts": "10bb0d014b0ece532c3bc395c50ae25996315a5897c0216517d9174c2fb570b5",
     "https://deno.land/x/zod@v3.20.5/errors.ts": "5285922d2be9700cc0c70c95e4858952b07ae193aa0224be3cbd5cd5567eabef",
diff --git a/scripts/changelog/changelog_test.ts b/scripts/changelog/changelog_test.ts
new file mode 100644
index 0000000..17b287d
--- /dev/null
+++ b/scripts/changelog/changelog_test.ts
@@ -0,0 +1,61 @@
+import { assertEquals } from "$std/assert/assert_equals.ts"
+import { outdent } from "$dax/src/deps.ts"
+import { getSections, parseCommits } from "./mod.ts"
+import { renderBBCode } from "./render_bbcode.ts"
+
+export const exampleCommits = parseCommits([
+  "feat: asdf (#1234)",
+  "feat!: test (#123)",
+  "fix(L10n): language stuff (#415)",
+])
+const exampleSections = getSections(exampleCommits)
+
+Deno.test("parseCommits() correctly parse commits", () => {
+  assertEquals(exampleCommits, [
+    {
+      type: "feat",
+      scopes: undefined,
+      breaking: undefined,
+      subject: "asdf",
+      pr: "1234",
+    },
+    {
+      type: "feat",
+      scopes: undefined,
+      breaking: "!",
+      subject: "test",
+      pr: "123",
+    },
+    {
+      type: "fix",
+      scopes: "L10n",
+      breaking: undefined,
+      subject: "language stuff",
+      pr: "415",
+    },
+  ])
+})
+
+Deno.test("renderBBCode() outputs identical text", () =>
+  assertEquals(
+    renderBBCode({ version: "v1.0.0", date: "2024-03-12", sections: exampleSections }),
+    outdent`
+      [h1]v1.0.0 (2024-03-12)[/h1]
+
+      [h2]Breaking Changes[/h2]
+      [list]
+          [*] test ([url=https://github.com/scarf005/marisa/pull/123]#123[/url])
+      [/list]
+
+      [h2]New Features[/h2]
+      [list]
+          [*] asdf ([url=https://github.com/scarf005/marisa/pull/1234]#1234[/url])
+          [*] test ([url=https://github.com/scarf005/marisa/pull/123]#123[/url])
+      [/list]
+
+      [h2]Fixes[/h2]
+      [list]
+          [*] language stuff ([url=https://github.com/scarf005/marisa/pull/415]#415[/url])
+      [/list]
+  `,
+  ))
diff --git a/scripts/changelog/mod.ts b/scripts/changelog/mod.ts
new file mode 100644
index 0000000..eb2eceb
--- /dev/null
+++ b/scripts/changelog/mod.ts
@@ -0,0 +1,49 @@
+import $ from "$dax/mod.ts"
+import { typedRegEx } from "https://deno.land/x/typed_regex@0.2.0/mod.ts"
+import type { RegExCaptureResult } from "https://deno.land/x/typed_regex@0.2.0/type_parser.ts"
+
+import { renderBBCode } from "./render_bbcode.ts"
+
+export type Commit = RegExCaptureResult<typeof re>
+export type Sections = Record<string, Commit[]>
+
+export const getTags = () => $`git tag --sort=-v:refname`.lines()
+
+type CommitRange = { from: string; to: string }
+export const getCommits = ({ from, to }: CommitRange) =>
+  $`git log ${from}..${to} --pretty=format:"%s"`.lines()
+
+const re =
+  "^(?<type>\\w+)(\\((?<scopes>.*)?\\))?(?<breaking>!)?:\\s*(?<subject>.*?)\\s*\\(#(?<pr>\\d+)\\)$"
+
+const commitParser = typedRegEx(re)
+
+export const parseCommits = (xs: string[]) =>
+  xs
+    .map(commitParser.captures)
+    .filter((x): x is Commit => x !== undefined)
+    .filter((x) => x.breaking || ["fix", "feat"].includes(x.type))
+
+export const getSections = (commits: Commit[]): Sections => ({
+  "Breaking Changes": commits.filter((x) => x.breaking),
+  "New Features": commits.filter((x) => x.type === "feat"),
+  Fixes: commits.filter((x) => x.type === "fix"),
+})
+
+if (import.meta.main) {
+  const [latestTag] = await getTags()
+  const commits = await getCommits({ from: latestTag, to: "main" }).then(parseCommits)
+
+  const sections: Sections = getSections(commits)
+
+  console.log(latestTag)
+  console.log(sections)
+  console.log(commits)
+  console.log(
+    renderBBCode({
+      version: "v1.0.0",
+      date: new Date().toISOString().split("T")[0],
+      sections,
+    }),
+  )
+}
diff --git a/scripts/changelog/render.ts b/scripts/changelog/render.ts
new file mode 100644
index 0000000..6f2f6c0
--- /dev/null
+++ b/scripts/changelog/render.ts
@@ -0,0 +1,18 @@
+import { Commit, Sections } from "./mod.ts"
+
+export type ChangelogRenderer = (option: {
+  version: string
+  date: string
+  sections: Sections
+}) => string
+
+export type SectionFormatter = (tup: [section: string, commits: Commit[]]) => string
+export type SectionsFormatter = { fmtSection: SectionFormatter; sections: Sections }
+
+export const renderSections = (
+  { fmtSection, sections }: SectionsFormatter,
+) =>
+  Object.entries(sections)
+    .filter(([, commits]) => commits.length > 0)
+    .map(fmtSection)
+    .join("\n\n")
diff --git a/scripts/changelog/render_bbcode.ts b/scripts/changelog/render_bbcode.ts
new file mode 100644
index 0000000..f3842ee
--- /dev/null
+++ b/scripts/changelog/render_bbcode.ts
@@ -0,0 +1,16 @@
+import { outdent } from "$dax/src/deps.ts"
+import { Commit } from "./mod.ts"
+import { ChangelogRenderer, renderSections, SectionFormatter } from "./render.ts"
+
+const fmtCommit = (x: Commit) =>
+  `    [*] ${x.subject} ([url=https://github.com/scarf005/marisa/pull/${x.pr}]#${x.pr}[/url])`
+
+const fmtSection: SectionFormatter = ([section, commits]) =>
+  `[h2]${section}[/h2]\n` + "[list]\n" + commits.map(fmtCommit).join("\n") + "\n[/list]"
+
+export const renderBBCode: ChangelogRenderer = ({ version, date, sections }) =>
+  outdent`
+    [h1]${version} (${date})[/h1]
+
+    ${renderSections({ fmtSection, sections })}
+  `