Given one header, recursively find all other files it #includes

recurse-includes.sh

#!/bin/bash

set -e

START="folly/SharedMutex.h"
ALL=$START
NEW=""

# could simplyify with `sort -t' ' -u`
while ! diff -q <(echo $ALL | tr ' ' '\n' | sort -u) <(echo $NEW | tr ' ' '\n' | sort -u) >/dev/null ; do
  ALL=$(echo "$NEW $ALL" | tr ' ' '\n' | sort -u | tr '\n' ' ')
  NEW=$(grep \#include ${ALL} | grep -o "<folly/[^>]*" | sed 's/<//g' | sort -u | tr '\n' ' ')
  NEW=$(echo "$START $NEW" | tr ' ' '\n' | sort -u | tr '\n' ' ')
done

echo $ALL
echo

BASE=slimfolly
for i in $ALL ; do
  mkdir -p $BASE/$(dirname $i)
  CPP=$(echo $i | sed 's/.h$/.cpp/')
  cp $i $BASE/$i
  if [ -e $CPP ] ; then
    cp $CPP $BASE/$CPP
    echo $CPP
  fi
done