add command line arg instead of current xl hack

README.md

@@ -1,6 +1,6 @@
 # A minimalist calculator for fermi estimation
 
-This project is a minimalist, stack-based DSL for fermi estimation. It can multiply, divide, add and substract scalars, lognormals and beta distributions.
+This project is a minimalist, calculator-style DSL for fermi estimation. It can multiply, divide, add and substract scalars, lognormals and beta distributions.
 
 ## Motivation
 
@@ -120,6 +120,7 @@ help
 
 - It's conceptually clearer to have all the multiplications first and then all the divisions
 - For things between 0 and 1, consider using a beta distribution
+- Because the model reads from standard input, you can pipe a model to it. For instance, try cat more/piano-tuners.f | fermi
 
 ## Different levels of complexity
 
@@ -161,6 +162,7 @@ Done:
 
 To (possibly) do:
 
+- [ ] Specify number of samples as a command line option
 - [ ] Document parenthesis syntax
 - [ ] Add functions. Now easier to do with an explicit representation of the stakc
 - [ ] Think about how to draw a histogram from samples

f.go

@@ -364,6 +364,7 @@ replForLoop:
 
 		switch {
 		case strings.TrimSpace(new_line_trimmed) == "": /* Empty line case */
+			continue replForLoop
 		/* Parenthesis */
 		case len(words) == 2 && (words[0] == "*" || words[0] == "+" || words[0] == "-" || words[0] == "/") && words[1] == "(":
 			new_stack := runRepl(Stack{old_dist: INIT_DIST, vars: stack.vars}, reader)
@@ -392,8 +393,6 @@ replForLoop:
 			fmt.Printf("%s ", words[1])
 			prettyPrintDist(stack.old_dist)
 			stack.old_dist = INIT_DIST
-			// fmt.Println()
-			// continue replForLoop
 		default:
 			op, new_dist, err := parseWordsIntoOpAndDist(words, stack.vars)
 			if err != nil {

makefile

@@ -9,3 +9,9 @@ install: f
 	rm /usr/bin/f
 	sudo mv f /usr/bin/f
 	sudo ln -s /usr/bin/f /usr/bin/fermi
+
+install_xl: f 
+	rm /usr/bin/fermixl
+	rm /usr/bin/fxl
+	sudo mv f /usr/bin/fxl
+	sudo ln -s /usr/bin/fxl /usr/bin/fermixl