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#!/bin/bash

# Exit immediately if a command exits with a non-zero status.

# Treat unset variables as an error.

set -euo pipefail

A2A_SPEC_REPO="https://github.com/a2aproject/A2A.git" # URL for the A2A spec repo.

A2A_SPEC_BRANCH="main" # Name of the branch with experimental changes.

FEATURE_BRANCH="experimental-types" # Name of the feature branch to create.

ROOT_DIR=$(git rev-parse --show-toplevel)

usage() {

cat <<EOF

Usage: $0 [OPTIONS]

Creates a new feature branch with types generated from unmerged A2A spec changes.

This script clones the A2A spec repository, checks out a specific branch,

and creates a new local feature branch from it.

The script requires uv and buf to be installed.

OPTIONS:

-r, --spec-repo URL for the A2A spec repository.

(Default: "$A2A_SPEC_REPO")

-b, --spec-branch Name of the branch with the experimental changes.

(Default: "$A2A_SPEC_BRANCH")

-f, --feature-branch Name of the new feature branch to create.

(Default: "$FEATURE_BRANCH")

-h, --help Display this help message and exit.

EXAMPLE:

# Run with all default settings:

$0

# Run with custom settings:

$0 -r "https://github.com/spec-fork/A2A.git" -b "spec-change" -f "my-branch"

EOF

}

# Handle command-line arguments.

while [[ $# -gt 0 ]]; do

case $1 in

-h|--help)

usage

exit 0

;;

-r|--spec-repo)

A2A_SPEC_REPO="$2"

shift 2

;;

-b|--spec-branch)

A2A_SPEC_BRANCH="$2"

shift 2

;;

-f|--feature-branch)

FEATURE_BRANCH="$2"

shift 2

;;

*)

echo "Error: Unknown option '$1'" >&2

usage

exit 1

;;

esac

done

TMP_WORK_DIR=$(mktemp -d)

echo "Created a temporary working directory: $TMP_WORK_DIR"

trap 'rm -rf -- "$TMP_WORK_DIR"' EXIT

cd $TMP_WORK_DIR

echo "Cloning the \"$A2A_SPEC_REPO\" repository..."

git clone $A2A_SPEC_REPO spec_repo

cd spec_repo

echo "Checking out the \"$A2A_SPEC_BRANCH\" branch..."

git checkout "$A2A_SPEC_BRANCH"

echo "Invoking the generate_types.sh script..."

GENERATED_FILE="$ROOT_DIR/src/a2a/types.py"

$ROOT_DIR/scripts/generate_types.sh "$GENERATED_FILE" --input-file "$TMP_WORK_DIR/spec_repo/specification/json/a2a.json"

echo "Running buf generate..."

cd "$ROOT_DIR"

buf generate

uv run "$ROOT_DIR/scripts/grpc_gen_post_processor.py"

echo "Committing generated types file to the \"$FEATURE_BRANCH\" branch..."

git checkout -b "$FEATURE_BRANCH"

git add "$GENERATED_FILE" "$ROOT_DIR/src/a2a/grpc"

git commit -m "Experimental types"