merge_cpp.sh

#!/usr/bin/env bash

# Usage:
#
# # Compile main.cpp to merged_main.cpp
# ./merge.sh 
#
# # Compile index.cpp to merged_main.cpp
# ./merge.sh index.cpp
#
# # Compile index.cpp to output.cpp
# ./merge.sh index.cpp output.cpp
#
# # Compile index.cpp to merged_main.cpp and prepend a notice for programming teacher as to why I use this
# ./merge.sh index.cpp output.cpp --add-notice

mergefile="Mergefile"
defaultMain="${1:-main.cpp}"
outfile="${2:-merged_main.cpp}"

# Support for default Mergefile
usingDefaultMergefile=false
if [ ! -f $mergefile ]
then
    echo "$defaultMain" > $mergefile
    echo "Default merge file not found, supposing '$defaultMain' is the main file to be preprocessed!"
    usingDefaultMergefile=true
fi

# Download Node merge script and run it
merge="merge.js"
curl https://raw.githubusercontent.com/kshaa/single-c-file/master/single-c-file.js > $merge
node $merge $mergefile $outfile

# Flag-based (--add-notice) notice for teacher regarding how this merge works
if [[ $* == *--add-notice* ]]
then
    printf '%s\n%s\n' "// This was to work around the following issue - https://github.com/PPakalns/APTS/issues/8" "$(cat $outfile)" > $outfile
    printf '%s\n%s\n' "// P.S. The original author of the script is Adrian Dawid, I personally forked it and added some extra features" "$(cat $outfile)" > $outfile
    printf '%s\n%s\n' "// Source of the NodeJS script - https://github.com/kshaa/single-c-file" "$(cat $outfile)" > $outfile
    printf '%s\n%s\n' "// This content was generated using a tiny NodeJS script which acts as a C++ preprocessor" "$(cat $outfile)" > $outfile
fi

# Remove default Mergefile
if [ "$usingDefaultMergefile" = true ]
then
    rm $mergefile
fi

# Remove downloaded Node merge script
rm $merge