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#!/usr/bin/env bash
# Split a generated C-file into the command used to generate it,
# and the outputted code itself.
# This is useful because it allows input and output to be inside the same file
# How it works:
# - The first line needs to start with '//' (and becomes the command).
# - Whitespace/padding between the comment and the generated code is ignored
# - To write a command using multiple lines, end each line with backslash (\)
# Count the number of lines before the output text starts
# commandLineCount FILE
commandLineCount() {
local n state
n=0
state="init"
while IFS="" read -r p || [ -n "$p" ]; do
case $state in
init)
if [[ $p =~ ^//.*\\$ ]]; then state="comment"
elif [[ $p =~ ^//.* ]]; then state="padding"
else break
fi
;;
comment) [[ ! $p =~ ^.*\\$ ]] && state="padding";;
padding) [ -n "${p// }" ] && break;;
esac
n=$((n+1))
done < "$1"
printf '%s' "$n"
}
# getInputCommand FILE
getInputCommand() {
n=$(commandLineCount "$1")
head -n "$n" "$1" | awk '{ if (NR == 1) print substr($0, 3); else print $0 }'
}
# getOutputText FILE
getOutputText() {
n=$(commandLineCount "$1")
sed "1,${n}d" "$1"
}
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