#!/usr/bin/env bash
# Pre-tool hook: block Windows backslash paths in Bash commands.
#
# Blocks patterns like C:\Users\foo passed inside Bash command strings.
# Enforces forward slashes: C:/Users/foo
#
# Why: Git Bash mangles backslash paths — C:\tmp writes to a different
# directory than the Write tool's C:\tmp, causing stale payload bugs.

input=$(cat)
cmd=$(echo "$input" | jq -r '.tool_input.command // ""' 2>/dev/null)

# Match a drive letter followed by a literal backslash in the command.
# In the extracted command string (not JSON-escaped), backslash is just \.
if echo "$cmd" | grep -qE '[A-Za-z]:\\[A-Za-z/\\]'; then
    echo "BLOCKED: Use forward slashes for Windows paths in Bash commands."
    echo ""
    echo "  Wrong:   C:\\Users\\guru\\file.txt"
    echo "  Correct: C:/Users/guru/file.txt"
    echo ""
    echo "Git Bash converts backslash paths unpredictably. PowerShell and Windows"
    echo "APIs both accept forward slashes without issue."
    exit 2
fi

exit 0