feat!: initial commit

Signed-off-by: João Augusto Costa Branco Marado Torres <torres.dev@disroot.org>

1 files changed, 131 insertions, 0 deletions

diff --git a/src/lib/git/log.ts b/src/lib/git/log.ts
new file mode 100644
index 0000000..86bbe7b
--- /dev/null
+++ b/src/lib/git/log.ts
@@ -0,0 +1,131 @@
+import { defined } from "../../utils/anonymous.ts";
+import { type MaybeIterable, surelyIterable } from "../../utils/iterator.ts";
+import { gitDir } from "./index.ts";
+import type { Commit, CommitFile } from "./types.ts";
+
+const format = [
+  "H",
+  "h",
+  "aI",
+  "aN",
+  "aE",
+  "cI",
+  "cN",
+  "cE",
+  // "G?",
+  "GS",
+  "GK",
+  "GF",
+  "GG",
+];
+
+export async function getLastCommitForOneOfFiles(
+  sources: MaybeIterable<URL>,
+): Promise<Commit | undefined> {
+  const files = surelyIterable(sources);
+  const gitLog = new Deno.Command("git", {
+    args: [
+      "log",
+      "-1",
+      `--pretty=format:${format.map((x) => `%${x}`).join("%n")}`,
+      "--",
+      ...Iterator.from(files).map((x) => x.pathname),
+    ],
+  });
+
+  const { stdout } = await gitLog.output();
+  const result = new TextDecoder().decode(stdout).trim();
+
+  if (result.length <= 0) {
+    return undefined;
+  }
+
+  const [
+    hash,
+    abbrHash,
+    authorDate,
+    authorName,
+    authorEmail,
+    committerDate,
+    committerName,
+    committerEmail,
+    // signatureValidation,
+    signer,
+    key,
+    keyFingerPrint,
+    ...rawLines
+  ] = result.split("\n");
+
+  const raw = rawLines.join("\n").trim();
+
+  const commit: Commit = {
+    files: await fileStatusFromCommit(hash, Iterator.from(files)),
+    hash: { long: hash, short: abbrHash },
+    author: {
+      date: new Date(authorDate),
+      name: authorName,
+      email: authorEmail,
+    },
+    committer: {
+      date: new Date(committerDate),
+      name: committerName,
+      email: committerEmail,
+    },
+  };
+
+  if (raw.length > 0) {
+    commit.signature = {
+      type: raw.startsWith("gpgsm:")
+        ? "x509"
+        : raw.startsWith("gpg:")
+        ? "gpg"
+        : "ssh",
+      signer,
+      key: { long: keyFingerPrint, short: key },
+      rawMessage: raw,
+    };
+  }
+
+  return commit;
+}
+
+async function fileStatusFromCommit(
+  hash: string,
+  files: Iterable<URL>,
+): Promise<CommitFile[]> {
+  const gitDiffTree = new Deno.Command("git", {
+    args: [
+      "diff-tree",
+      "--no-commit-id",
+      "--name-status",
+      "-r",
+      hash,
+    ],
+  });
+
+  const { stdout } = await gitDiffTree.output();
+  const result = new TextDecoder().decode(stdout).trim().split("\n").filter(
+    defined,
+  );
+
+  const dir = await gitDir();
+  return result.map((line) => {
+    const [status, path] = line.split("\t");
+    if (
+      Iterator.from(files).some((file) =>
+        file.pathname.replace(dir.pathname, "").includes(path)
+      )
+    ) {
+      return {
+        path: new URL(path, dir),
+        status: status === "A"
+          ? "added"
+          : status === "D"
+          ? "deleted"
+          : "modified",
+      } as const;
+    }
+
+    return undefined;
+  }).filter(defined);
+}