Git plugin: hash-and-add - Hashes a file and adds to index. Convenient for hashing a filename for use in content delivery and caching (CDN)

git-hash-and-add

#!/bin/bash

# git-hash-and-add: A Git plugin to hash a file, rename it with a hash suffix, and add it to the index.
# Supports two modes: default short SHA, and full SHA with --no-abbrev-commit.

# Check if a file argument is provided
if [ $# -lt 1 ]; then
    echo "Usage: git hash-and-add <file> [--no-abbrev-commit]"
    echo "  Hashes the file, renames it with a hash suffix, and adds it to Git."
    echo "  --no-abbrev-commit: Use full SHA instead of short SHA."
    exit 1
fi

# Get the input file
FILE="$1"
shift

# Check if the file exists
if [ ! -f "$FILE" ]; then
    echo "Error: File '$FILE' not found."
    exit 1
fi

# Determine hash mode
FULL_SHA=false
if [ "$1" = "--no-abbrev-commit" ]; then
    FULL_SHA=true
    shift
fi

# Compute the hash using git hash-object
if $FULL_SHA; then
    HASH=$(git hash-object "$FILE")
else
    HASH=$(git hash-object "$FILE" | cut -c1-7) # Short SHA (first 7 characters)
fi

# Extract the original filename and extension
FILENAME=$(basename "$FILE")
EXTENSION="${FILENAME##*.}"
NAME="${FILENAME%.*}"

# Create new filename with hash suffix
NEW_FILENAME="${NAME}-${HASH}.${EXTENSION}"

# Rename the file
cp "$FILE" "$NEW_FILENAME"
if [ $? -ne 0 ]; then
    echo "Error: Failed to rename file."
    exit 1
fi

# Add the new file to Git
git add "$NEW_FILENAME"
if [ $? -ne 0 ]; then
    echo "Error: Failed to add file to Git."
    exit 1
fi

echo "Successfully hashed, renamed to '$NEW_FILENAME', and added to Git."