LinuxCNC Features - a kind of NGCGUI

	def process(self, s) :
	.
	.
	.
 		for p in self.param :
 	           if "call" in p.attr and "value" in p.attr :
        	        s = re.sub(r"%s([^A-Za-z0-9_]|$)" % (re.escape(p.attr["call"])), r"%s\1" % (p.attr["value"]), s)
	#next line added after params are replaced with their values
        	s = re.sub(r"(?ims)(<subprocess>(.*?)</subprocess>)", exec_callback, s)

def process(self, s) :

        def eval_callback(m) :
            return str(eval(m.group(2), globals(), {"self":self}))

        def exec_callback(m) :
            s = m.group(2)

            # strip starting spaces
            s = s.replace("\t", "  ")
            i = 1e10
            for l in s.split("\n") :
                if l.strip() != "" :
                    i = min(i, len(l) - len(l.lstrip()))
            if i < 1e10 :
                res = ""
                for l in s.split("\n") :
                    res += l[i:] + "\n"
                s = res

            old_stdout = sys.stdout
            redirected_output = StringIO()
            sys.stdout = redirected_output
            exec(s) in {"self":self}
            sys.stdout = old_stdout
            redirected_output.reset()
            out = str(redirected_output.read())
            return out

        def subprocess_callback(m) :
            s = m.group(2)

            # strip starting spaces
            s = s.replace("\t", "  ")
            i = 1e10
            for l in s.split("\n") :
                if l.strip() != "" :
                    i = min(i, len(l) - len(l.lstrip()))
            if i < 1e10 :
                res = ""
                for l in s.split("\n") :
                    res += l[i:] + "\n"
                s = res
            return subprocess.check_output([s], shell = True)

        def import_callback(m) :
            fname = m.group(2)
            if fname != None :
                try :
                    return str(open(fname).read())
                except :
                    StatusBar.push(SB_File_context_id, _("File not found : %s") % fname)
            else :
                mess_dlg(_("File not found : %(f)s in %(p)s" % {"f":fname, "p":(XML_DIR)}))
                raise IOError("IOError File not found : %(f)s in %(p)s" % {"f":fname, "p":(XML_DIR)})

        s = re.sub(r"(?i)(<import>(.*?)</import>)", import_callback, s)
        s = re.sub(r"(?i)(<eval>(.*?)</eval>)", eval_callback, s)
        s = re.sub(r"(?ims)(<exec>(.*?)</exec>)", exec_callback, s)

        for p in self.param :
            if "call" in p.attr and "value" in p.attr :
                s = re.sub(r"%s([^A-Za-z0-9_]|$)" % (re.escape(p.attr["call"])), r"%s\1" % (p.attr["value"]), s)

        s = re.sub(r"(?ims)(<subprocess>(.*?)</subprocess>)", subprocess_callback, s)
        s = re.sub(r"#self_id", "%s" % self.get_attr("id"), s)
        return s

[CALL]
content = 
 	o<#self_id> if [#param_ena]
 		<subprocess>./lib/engrave-feature.py -X#param_x -Y#param_y -S#param_xscale -s#param_yscale -Z#param_s -D#param_dpt -A#param_rot -W#param_word -C#param_char -M#param_mirror -F#param_flip -f#param_font -0'#param_line0 ' -1'#param_line1 ' -2'#param_line2 ' -3'#param_line3 ' -4'#param_line4 ' -5'#param_line5 ' -6'#param_line6 ' -7'#param_line7 ' -8'#param_line8 ' -9'#param_line9 ' -y'#param_yoff'</subprocess>
 	o<#self_id> endif

[PARAM_FONT]
name = Font
type = filename
patterns = *.cxf:*.ttf
mime_types = text/ttf
filter_name = Supported Fonts
tool_tip = Select a Font file
value = /usr/share/fonts/truetype/liberation/LiberationSans-Bold.ttf