tig

A lightweight git clone.

Commands:

• init
• cat-file
• hash-object
• update-ref

Get Started

tig doesn't provide high level apis such add and commit. But it is possible to achieve using a few git commands.

Initialize repo

tig init .

Adding file

Since the index is so hard to implement, I will manually use update-index

git add will do:

tig hash-object -w blob README.md

git update-index --add --cacheinfo 100644 <blob-hash> README.md

Git status should show the README.md file as added now.

git status

Commiting

After updating the index, this is, saving the state of the stagin area, we can create a tree object of this state.

Commiting a tree will create a commit object

git write-tree

git cat-file -p <tree-hash>

git commit-tree -m "Initial Commit" <tree-hash>

git cat-file -p <commit-hash>

git log --stat <commit-hash>

Pointing to this commit hash will

tig update-ref refs/heads/master <commit-hash>

Git log will now show the commit message.

git log