Auto-Generate AI Commit Message using Gemini CLI
When working on side projects or writing a blog post, I don’t want to go to IDE and then use AI generated commit message feature. Instead I prefer doing it via CLI itself by running a single command.
Let’s see how I do it using gemini-cli in the background.
Generating the commit message
git diff | gemini --prompt "Generate a concise commit message:"
What we’re doing here is:
git diff: It outputs the changes you’ve made that are not yet staged for commit.- Piping to
gemini: The output from git diff is piped into the gemini command. gemini --prompt "Generate a concise commit message:": It invokes the Gemini CLI sending the provided prompt along with the piped input (your git diff)
Note: You can pass --model arg in gemini cli to change the model to something like gemini-2.5-flash as well
Aborting in case of empty message
commit_msg=$(git diff | gemini --prompt "Generate a concise commit message:")
if [ -z "$commit_msg" ]; then
echo "Commit message is empty. Aborting commit."
exit 1
fi
git commit -am "$commit_msg"
Complete Snippet
#!/bin/bash
# Stage all changes
git add .
# List staged files
added_files=$(git diff --cached --name-only)
if [ -z "$added_files" ]; then
echo "⚠️ No changes to commit. Aborting."
exit 1
fi
echo "📄 Files staged for commit:"
echo "$added_files"
# Generate commit message using Gemini
commit_msg=$(git diff --cached | gemini --model gemini-2.5-flash --prompt "Generate a concise commit message:")
# Check if commit message is empty
if [ -z "$commit_msg" ]; then
echo "❌ Commit message is empty. Aborting commit."
exit 1
fi
# Commit with the generated message
git commit -m "$commit_msg"
Happy auto committing!
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