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#!/bin/bash
# shopenscad.sh: parse a .scad file and generate an openscad command with all
# its var=value's parameterized into -D options, which can be overriden with
# shell variables.
#
# Usage examples:
#
# $ ./shopenscad.sh cubbies.scad
# openscad 'cubbies.scad' -D 'part="divider"' -D 'cubby_width=50' -D 'cubby_depth=180' -D 'cubby_divider_height=90' -D 'thickness=5' -D 'strut_thickness=5' -D 'tab_width=10' -D 'tab_padding=5' -D 'tab_tolerance=0.5' -o 'divider=50=180=90=5=5=10=5=0.5.stl'
# [openscad output omitted]
#
# (the openscad command is printed and then evaluated, outputing to the file
# indicated after the -o flag)
#
# You can also overwrite the variables parsed from your scad file by passing a
# shell variable with the same name:
#
# $ cubby_width=200 part=\"bottom\" ./shopenscad.sh cubbies.scad
# openscad 'cubbies.scad' -D 'part="bottom"' -D 'cubby_width=200' -D 'cubby_depth=180' -D 'cubby_divider_height=90' -D 'thickness=5' -D 'strut_thickness=5' -D 'tab_width=10' -D 'tab_padding=5' -D 'tab_tolerance=0.5' -o 'bottom=200=180=90=5=5=10=5=0.5.stl'
# [openscad output omitted]
#
# Now we can easily generate multiple models:
#
# $ for w in 250 300 350 400; do
# > for p in '"divider"' '"bottom"'; do
# > cubby_width="$w" part="$p" ./shopenscad.sh cubbies.scad
# > done
# > done
# [openscad output omitted]
openscad=${OPENSCAD:-"openscad"}
# yes_eval=false
# no_eval=false
interactive=false
run=true
print_vars=false
user_output_filename=
while getopts pino: opt; do
case $opt in
p) print_vars=true ;; # print variables that were parsed
i) interactive=true ;; # suppress interactive output -- do eval cmd
n) run=false ;; # do not eval cmd
o) user_output_filename="$OPTARG" ;; # override default output filename
esac
done
shift $(($OPTIND - 1))
scad_file="$*"
if [ ! "$scad_file" ]; then
echo "$0: needs an input scad file"
exit 1
fi;
function strip_comments () {
strip_multiline_comments
}
function strip_multiline_comments () {
# https://stackoverflow.com/questions/13061785/remove-multi-line-comments
# https://stackoverflow.com/users/751863/steve
sed -r ':a; s%(.*)/\*.*\*/%\1%; ta; /\/\*/ !b; N; ba'
}
function strip_trailing_semicolon () {
sed -r 's/;$//'
}
function strip_leading_spaces () {
sed -r 's/^ +//'
}
function strip_trailing_spaces () {
sed -r 's/ +$//'
}
function strip_nonassignments () {
grep -e '^[A-Za-z0-9_]\+\s*='
}
function chomp () {
strip_leading_spaces |strip_trailing_spaces
}
function parse_variable () {
#sed -r 's/^([a-zA-Z0-9_]+).*/\1/'
sed -r 's/^([^=]+)=.*/\1/'
}
function parse_value () {
#sed -r 's/^.*?=\s*([^;]+);.*$/\1/'
#sed -r 's/^[^=]+\s*=\s*([^;]+);.*$/\1/'
sed -r 's/.*=\s*([^;]+?).*/\1/'
}
function val_to_filename () {
echo "$1" |sed -r 's/"//g' |sed -r 's/ /_/g'
}
function strip_last_char () {
echo "$1" |sed -r 's/.$//'
}
function strip_after_hidden () {
echo "$1" |sed -n '/\/\* \[Hidden\] \*\//q;p' cubbies.scad
}
function strip_trailing () {
trailing="$1"
input="$2"
echo ${input%${trailing}}
}
output_params=""
default_output_filename=""
all=""
values_only=""
val_sep="="
var_sep=","
declare -A scad
while IFS= read -r line; do
[ "$line" ] || continue;
clean="$(echo -n "$line" |chomp)"
var=$(echo -n "$clean" |parse_variable |chomp)
# use value provided on command line preferentially to any values in the .scad file
val=""
if [[ -n "${!var}" ]]; then
val=${!var}
else
val=$(echo -n "$clean" |parse_value |chomp)
fi
if [ "$var" ] && [ "$val" ]; then
scad[$var]="$val"
output_params+="-D '$var=$val' "
values_only+="$(val_to_filename "$val")${val_sep}"
all+="${var}${val_sep}$(val_to_filename "$val")${var_sep}"
fi;
done < <(echo "$(cat "$scad_file")" |
strip_comments |strip_after_hidden |strip_nonassignments |strip_trailing_semicolon)
if $print_vars; then
echo The following variables have been parsed from ${scad_file}:
for k in "${!scad[@]}"; do
echo ${k}=${scad[$k]}
done; echo
fi
all=$(strip_trailing "$val_sep" "$all")
values_only=$(strip_trailing "$val_sep" "$values_only")
default_output_filename="$(strip_trailing "-" "${values_only}").stl"
output_filename="$default_output_filename"
if [ "$user_output_filename" ]; then
output_filename=$(echo $(eval "echo $user_output_filename"))
fi
#openscad_str="$openscad "$scad_file" "$output_params" -o $(strip_trailing "-" "${values_only}").stl"
openscad_str="$openscad '$scad_file' "$output_params" -o '$output_filename'"
#openscad_str="$openscad '$scad_file' "$output_params" -o '${all}.stl'"
# ${open_filename//'/'\\''}
echo "${openscad_str}"
$print_vars || ! $run && ! $interactive && exit
if $interactive; then
eval_prompt="Evaulate openscad command? (type y for yes, anything else to exit): "
read -p "$eval_prompt" -n1 yes_eval_read
echo
case "$yes_eval_read" in
[Yy]) run=true ;; # still true
*) run=false ;;
esac
fi
#sed -nel <<< "$openscad_str"
$run && eval "$openscad_str"
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