add shopenscad.sh for parsing parameters from scad files into -D parameters to openscad

1 files changed, 91 insertions, 0 deletions

diff --git a/shopenscad.sh b/shopenscad.sh
new file mode 100755
index 0000000..b044ded
--- /dev/null
+++ b/shopenscad.sh
@@ -0,0 +1,91 @@
+#!/bin/bash
+
+# parse a .scad file and generate an openscad command with all its var=value's
+# parameterized into -D options
+
+
+openscad="openscad"
+
+scad_file="$1"
+
+function strip_comments () {
+    strip_multiline_comments
+}
+
+function strip_multiline_comments () {
+    # https://stackoverflow.com/questions/13061785/remove-multi-line-comments
+    # https://stackoverflow.com/users/751863/steve
+    sed -r ':a; s%(.*)/\*.*\*/%\1%; ta; /\/\*/ !b; N; ba'
+}
+
+function strip_spaces () {
+    sed -r 's/ //g'
+}
+
+function strip_semicolon () {
+    sed -r 's/;$//'
+}
+
+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*([^;]+);.*$/\1/'
+    sed -r 's/.*=\s*([^;]+?).*/\1/'
+}
+
+
+function strip_empty_lines () {
+    sed -r '/^$/d'
+}
+
+function val_to_filename () {
+    echo "$1" |sed -r 's/"//g' |sed -r 's/ /_/g'
+}
+
+function strip_last_char () {
+    echo "$1" |sed -r 's/.$//'
+}
+
+function shopenscad () {
+    input_file="$1"
+    output_params=""
+    output_filename=""
+    while IFS= read -r line; do
+        clean="$(echo -n "$line" |chomp)"
+        var=$(echo -n "$clean" |parse_variable |chomp)
+        val=$(echo -n "$clean" |parse_value |chomp)
+        if [ "$var" ] && [ "$val" ]; then
+            output_params+="-D $var=$val "
+            output_filename+="$(val_to_filename "$val")-"
+        fi;
+    done < <(echo "$(cat "$input_file")" |strip_comments |strip_nonassignments |strip_empty_lines |strip_semicolon)
+
+    echo "$openscad $(strip_last_char "$output_params") -o ${output_filename}.stl"
+
+}
+
+shopenscad "$scad_file"
+
+
+