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fish-config/functions/save_antigravity_session.fish
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Fish
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#!/usr/bin/env fish
# Copyright (C) 2026 Rootiest
# SPDX-License-Identifier: AGPL-3.0-or-later
# SYNOPSIS
# Invoked as an Antigravity session hook; reads JSON from stdin.
#
# DESCRIPTION
# Hook script called by the Antigravity CLI (agy) on session start.
# Reads a JSON payload from stdin, extracts the session_id field, and
# writes it to .antigravity_session in the current directory. Ensures
# that file is excluded via .gitignore. Sets the universal variable
# LAST_ANTIGRAVITY_SESSION for cross-terminal access. Falls back to a
# no-op (emitting "{}") when python3 is unavailable (Convention §6).
#
# ARGUMENTS
# stdin JSON payload from the Antigravity CLI containing a "session_id" key
#
# RETURNS
# 0 Always; emits "{}" to stdout as required by the hook contract
#
# EXAMPLE
# echo '{"session_id":"abc123"}' | fish save_antigravity_session.fish
# cat .antigravity_session # → abc123
# echo $LAST_ANTIGRAVITY_SESSION # → abc123
# 1. Read the JSON from stdin
set -l input (cat)
# 2. Extract session_id using Python
# If python3 is unavailable, emit valid empty JSON and skip session
# tracking rather than erroring (see AGENTS.md Convention §6).
if not type -q python3
echo '{}'
exit 0
end
set -l sid (echo $input | python3 -c "import sys,json; print(json.load(sys.stdin).get('session_id', ''))")
set -l session_file ".antigravity_session"
if test -n "$sid"
# 3. Save the session ID locally
echo "$sid" >$session_file
# 4. Smart .gitignore check
# We only attempt this if we are inside a Git repository
if git rev-parse --is-inside-work-tree >/dev/null 2>&1
# If 'git check-ignore' fails, it means the file is NOT currently ignored
if not git check-ignore -q $session_file
# Append a labeled entry to .gitignore
echo -e "\n# AI Session IDs\n$session_file" >>.gitignore
end
end
# 5. Update universal variable for cross-terminal access
set -U LAST_ANTIGRAVITY_SESSION "$sid"
end
# MANDATORY: Every hook must output valid JSON or an empty object
echo '{}'