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Git Internals β€” DAG of Commits

Audience: Software EngineerCategory: Computer Science

Description

Visualizes Git's underlying commit DAG structure. Commit objects are shown as circles with abbreviated hash IDs, branches as colored labels pointing to commits, and HEAD as a special pointer. Operations animated include: git commit (new node), git branch (new label), git merge (merge commit with two parents), and git rebase (commits replayed on new base).

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Git Internals β€” DAG of Commits

Description

Visualizes Git's underlying commit DAG structure. Commit objects are shown as circles with abbreviated hash IDs, branches as colored labels pointing to commits, and HEAD as a special pointer. Operations animated include: git commit (new node), git branch (new label), git merge (merge commit with two parents), and git rebase (commits replayed on new base).

Phases

# Phase Name Duration Description
1 Intro 3s Title and initial commits displayed
2 Git Commit 6s New commit node added; HEAD and branch pointer move
3 Git Branch 5s New feature branch label appears; points to same commit as main
4 Branch Divergence 6s Commits added on main and feature independently
5 Git Merge 8s Merge commit created with two parent arrows; main moves forward
6 Git Rebase 10s Show original feature branch; replay commits on top of main
7 Outro 5s Final DAG displayed with all pointers labeled

Layout

+--------------------------------------------------+
|  Title: Git Internals β€” DAG of Commits           |
+--------------------------------------------------+
|                                                  |
|  main:    C1 ← C2 ← C3 ← M  (merge commit)      |
|                    \       /                     |
|  feature:           F1 ← F2                      |
|                                                  |
|  HEAD β†’ main β†’ M                                 |
|                                                  |
|  Rebase panel (bottom):                          |
|  Before: C3 ← F1' ← F2'  After rebase           |
+--------------------------------------------------+

Area Descriptions

  • Center: Commit DAG with circles and arrows
  • Labels: Branch names as colored rectangles attached to commit nodes
  • HEAD: Special yellow pointer label
  • Bottom: Rebase before/after comparison

Assets & Dependencies

  • Fonts: LaTeX / sans-serif
  • Manim version: ManimCE 0.19.1

Notes

  • Commit hashes shown as 7-char hex (e.g., "a1b2c3d")
  • Branch labels styled as colored pill-shaped labels
  • HEAD shown as yellow/gold pointer
  • Rebase shows old commits (faded) vs new replayed commits (bright)
  • Parent edges point left (child β†’ parent = newer β†’ older)