#Git History

# View full commit history
git log

# View concise one-line history
git log --oneline

# Limit number of commits
git log -n 5
git log --oneline -10

# View graphical branch history
git log --graph

# Combined usage
git log --oneline --graph -10

# Create demo project
mkdir git-history-demo
cd git-history-demo
git init

# Create initial commit
echo "# Git History Demo Project" > README.md
git add README.md
git commit -m "Initial commit: Add README"

# Add more commits
echo "Project description" >> README.md
git add README.md
git commit -m "Update README: Add description"

echo "console.log('Hello World');" > app.js
git add app.js
git commit -m "Add main app file"

echo "body { margin: 0; }" > style.css
git add style.css
git commit -m "Add style file"

# Custom format
git log --pretty=format:"%h - %an, %ar : %s"

# Common format options
git log --pretty=format:"%H"     # Full hash
git log --pretty=format:"%h"     # Short hash
git log --pretty=format:"%an"    # Author name
git log --pretty=format:"%ae"    # Author email
git log --pretty=format:"%ad"    # Author date
git log --pretty=format:"%ar"    # Relative date
git log --pretty=format:"%s"     # Commit message
git log --pretty=format:"%b"     # Commit body

# Beautified log format
git log --pretty=format:"%C(yellow)%h%C(reset) - %C(green)%an%C(reset), %C(blue)%ar%C(reset) : %s"

# View commits in specific period
git log --since="2 weeks ago"
git log --until="2023-12-01"
git log --since="2023-01-01" --until="2023-12-31"

# Relative time
git log --since="yesterday"
git log --since="1 week ago"
git log --since="2 months ago"

# Specific date format
git log --since="2023-01-01 00:00:00"
git log --after="Jan 1 2023" --before="Dec 31 2023"

# Filter by author
git log --author="John Doe"
git log --author="john@example.com"

# Regex support
git log --author="John.*"
git log --author=".*@company.com"

# Filter by committer
git log --committer="Jane Doe"

# Exclude specific author
git log --author="^(?!.*John Doe).*$" --perl-regexp

# Search commit messages
git log --grep="fix"
git log --grep="bug" --grep="fix" --all-match

# Search code changes
git log -S "function_name"
git log -G "regex"

# Search file content changes
git log -p -S "console.log"

# Ignore case
git log --grep="BUG" -i

# View history of specific file
git log README.md
git log -- README.md  # Safer syntax

# View multiple files
git log file1.txt file2.txt

# View directory history
git log src/
git log -- src/

# View deleted file history
git log --all --full-history -- deleted_file.txt

# Basic branch graph
git log --graph --oneline

# Detailed branch graph
git log --graph --pretty=format:"%C(red)%h%C(reset) -%C(yellow)%d%C(reset) %s %C(green)(%cr) %C(bold blue)<%an>%C(reset)"

# View all branches
git log --graph --oneline --all

# Simplified branch graph
git log --graph --simplify-by-decoration --oneline --all

# Show change stats
git log --stat

# Show short stats
git log --shortstat

# Show changed filenames only
git log --name-only

# Show file status
git log --name-status

# Show numeric stats
git log --numstat

# Show diff for each commit
git log -p

# Limit diff context lines
git log -p -U1

# Show diff for specific file only
git log -p -- file.txt

# Show word-level diff
git log -p --word-diff