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#!/bin/bash
# Clean: shellcheck -e 2001 ./cpp-script.sh
# NOTE: THIS SCRIPT HAS COPIES IN THE FOLLOWING REPOS:
# - CI/DOCKERFILES.GIT AND
# - CI/JOB/CONFIGS.GIT
# REMEMBER TO SYNCHRONIZE ALL COPIES ON CHANGES.
set -eu -o pipefail
input=""
vars=()
while [ $# -gt 0 ]; do
case $1 in
--input|-i) input="$2"; shift ;;
--var|-v) vars+=("$2"); shift ;;
*) echo "ERROR: Wrong option: $1"; usage ;;
esac
shift
done
if [ x"$input" = x"" ]; then
echo "ERROR: No --input parameter"
exit 1
fi
tmp_in=$(mktemp)
tmp_out=$(mktemp)
cp "$input" "$tmp_in"
# Iteratively include files until there are no more #include directives.
while grep -q "^#include .*\$" "$tmp_in"; do
include=$(grep "^#include .*\$" "$tmp_in" | head -n1)
inc_file=$(echo "$include" | sed -e "s/^#include \+//")
if [ ! -f "$inc_file" ]; then
echo "ERROR: #include file $inc_file does not exist" >&2
exit 1
fi
# Escape '/' in the path name
include=$(echo "$include" | sed -e "s#/#\\\\/#g")
# Instruct sed to read in the include and add extra '#' to #include line.
cat "$tmp_in" | sed -e "/^$include\$/ {
i #BEGIN: $inc_file
r $inc_file
a #END: $inc_file
d
}" > "$tmp_out"
cp "$tmp_out" "$tmp_in"
done
cpp_opts=()
# Undef all macros. Next loop will define the appropriate ones to "1".
for macro in $(unifdef -s -k -t "$tmp_in"); do
cpp_opts+=("-U${macro}")
done
declare -Ag vars_values
for var in "${vars[@]}"; do
name=$(echo "$var" | cut -d= -f 1)
value=$(echo "$var" | cut -s -d= -f 2)
# Define requested macros to "1".
cpp_opts+=("-D${name}_${value}=1")
# Gather all values for $name in $vars_values[$name]
if [ x"${vars_values[$name]+set}" = x"set" ]; then
vars_values[$name]="${vars_values[$name]} $value"
else
vars_values[$name]="$value"
fi
done
sed_opts=()
for name in "${!vars_values[@]}"; do
# Substitute #{NAME} with VALUE.
sed_opts+=("-e" "s/#{${name}}/${vars_values[$name]}/g")
done
unifdef -k -t -x2 "${cpp_opts[@]}" "$tmp_in" \
| sed -e "s/^//" "${sed_opts[@]+"${sed_opts[@]}"}"
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