I created a bash script that used sed to convert CMake's compile_commands.json into a .clang_complete file

gen_cc.sh

#!/bin/bash
usage() {
    echo "Cmake commands to clang complete generator usage:"
    echo "$0 input/directory [output/directory]"
}

generate_file() {
    cat $1/compile_commands.json |
        sed -r '/command/!d
            s/^ *"command": "//
            s/",$//
            s/ |(-c |-o )/\n\1/g' |
        sed -r '/^(\/|-o|-c|$)/d' |
        sort -u > $2/.clang_complete
}

if [[ $# -eq 0 ]] || [[ $# -gt 2 ]]; then
    usage
    exit 1
elif [[ $# -eq 1 ]]; then
    generate_file $1 "."
elif [[ $# -eq 2 ]]; then
    generate_file $1 $2
fi