1 files changed, 79 insertions, 0 deletions
diff --git a/appl/cmd/mathcalc.b b/appl/cmd/mathcalc.b
new file mode 100644
index 00000000..4f4f475f
--- /dev/null
+++ b/appl/cmd/mathcalc.b
@@ -0,0 +1,79 @@
+implement MathCalc;
+
+include "sys.m";
+	sys: Sys;
+
+include "draw.m";
+
+include "tk.m";
+	tk: Tk;
+
+include "bufio.m";
+	bufmod : Bufio;
+Iobuf : import bufmod;
+
+include "../lib/tcl.m";
+
+include "tcllib.m";
+
+
+MathCalc : module 
+{
+	init: fn(nil: ref Draw->Context, nil: list of string);
+};
+
+CALCPATH: con "/dis/lib/tcl_calc.dis";
+
+init(nil: ref Draw->Context, nil: list of string)
+{
+	sys = load Sys Sys->PATH;
+	cal := load TclLib CALCPATH;
+	if (cal==nil){
+		sys->print("mathcalc: can't load %s: %r\n", CALCPATH);
+		exit;
+	}
+	bufmod = load Bufio Bufio->PATH;
+	if (bufmod==nil){
+		sys->print("bufmod load %r\n");
+		exit;
+	}
+	iob := bufmod->fopen(sys->fildes(0),bufmod->OREAD);
+	if (iob==nil){
+		sys->print("mathcalc: cannot open stdin for reading: %r\n");
+		return;
+	}
+	input : string;
+	new_inp := "calc%";
+	sys->print("%s ", new_inp);
+	while((input=iob.gets('\n'))!=nil){
+		input=input[0:len input -1];
+		if (input=="quit")
+			exit;
+		arr:=array[] of {input};
+		(i,msg):=cal->exec(nil,arr);
+		if (msg!=nil)
+			sys->print("%s\n",msg);
+		sys->print("%s ", new_inp);
+	}
+	
+}
+
+
+# expr0 : expr1
+#	| expr0 '+' expr0
+#	| expr0 '-' expr0
+#	;
+#
+# expr1 : expr2
+#	| expr1 '*' expr1
+#	| expr1 '/' expr1
+#	;
+#
+# expr2 : '-' expr2
+#	| '+' expr2
+#	| expr3
+#	;
+#
+# expr3 : INT
+#	| REAL
+#	;