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#!/bin/bash
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# A script to scans workerd sources with clangd to look for issues
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# that make affect language services.
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output_dir=$(mktemp -d)
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top_of_tree=$(git rev-parse --show-toplevel)
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declare -a job_pids
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# Guess at number of CPUs (could be probed, but portable requires work).
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jobs_max=8
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# Check bash version to see if `wait -n` is supported. This allows waiting on first of any
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# process specified as an argument to wait to exit rather than waiting for all the processes
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# specified to exit. (ie batch vs stream).
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bash_major=$(echo $BASH_VERSION | sed -e 's/\..*/0000/')
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bash_minor=$(echo $BASH_VERSION | sed -e 's/^[^.]*\.//' -e 's/\..*//')
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bash_linear=$(($bash_major + $bash_minor))
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if [ ${bash_linear} -ge 50001 ]; then
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  wait_args="-n"
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fi
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cd "${top_of_tree}"
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for i in $(find . -name '*.h' -o -name '*.c++'); do
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    if [ ${#job_pids[*]} -eq ${jobs_max} ]; then
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        # macOS inparticular is stuck on an older version of bash and does not support `wait -n`
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        # here so child processes will run as batch waiting for all to complete there.
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        wait ${wait_args} "${job_pids[@]}"
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        for job_pid in "${job_pids[@]}"; do
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          if ! kill -0 ${job_pid} 2>/dev/null ; then
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            unset job_pids[${job_pid}]
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          fi
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        done
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    fi
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    j=${output_dir}/$(echo $i | sed  -e 's@^\./@@' -e s@/@_@g)
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    echo -n Scanning $i =\> $j
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    clangd --check=$i 1>$j 2>&1 &
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    echo " [$!]"
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    job_pids[$!]=$!
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done
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echo "Checking for broken includes."
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grep "not found" ${output_dir}/*
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cat <<EOF
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You may also want to inspect the output files for other issues.
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Please update compile_flags.txt to resolve any issues found.
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EOF