From a8a23a6cb3f20a3e1813f191727bcdb9c6884548 Mon Sep 17 00:00:00 2001
From: horus_arch
Date: Sun, 4 Feb 2018 20:01:00 +0100
Subject: Better Makefile. Source:
 https://www.complicissimus.de/golang-makefile/

---
 Makefile          | 30 ++++++++++++--------
 sanitize_price.go | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 utilities.go      | 28 -------------------
 3 files changed, 100 insertions(+), 40 deletions(-)
 create mode 100644 sanitize_price.go
 delete mode 100644 utilities.go

diff --git a/Makefile b/Makefile
index db2f498..7126e13 100644
--- a/Makefile
+++ b/Makefile
@@ -1,14 +1,20 @@
-SOURCE=alkobote.de
-
-all: run
-
-$(SOURCE): 
-	go build
-
-build: $(SOURCE)
-
+BINARY := $(notdir $(patsubst %/,%,$(dir $(abspath $(lastword $(MAKEFILE_LIST))))))
+MAINFILE :=
+SOURCEDIR := .
+SOURCES := $(shell find $(SOURCEDIR) -name '*.go')
+ 
+all: build run
+ 
+build: $(BINARY)
+ 
+$(BINARY): $(SOURCES)
+	go build -o $(BINARY)
+ 
 run: build
-	./$(SOURCE)
-
+	./$(BINARY)
+ 
 clean:
-	$(RM) $(SOURCE)
+	$(RM) $(RMFLAGS) $(BINARY)
+ 
+edit:
+	$(EDITOR) $(MAINFILE) *.go
diff --git a/sanitize_price.go b/sanitize_price.go
new file mode 100644
index 0000000..5be9e67
--- /dev/null
+++ b/sanitize_price.go
@@ -0,0 +1,82 @@
+package main
+
+import (
+	"errors"
+	"strconv"
+	"strings"
+)
+
+func sanitize_price(price string) (int, error) {
+	multiply_by_100 := false
+
+	price = strings.TrimSpace(price)
+
+	price = strings.TrimPrefix(price, "€")
+	price = strings.TrimSpace(price)
+
+	price = strings.TrimSuffix(price, "€")
+	price = strings.TrimSpace(price)
+
+	c := string(price[len(price)-2:])
+	c = string(c[0:1])
+
+	/*
+		Extracts the second last char and checks if it's a "." or a ",".
+	*/
+	if "," == c {
+		if strings.Count(price, ",") > 1 {
+			return 0, errors.New("Invalid format")
+		}
+
+		multiply_by_10 = true
+
+	} else if "." == c {
+		if strings.Count(price, ".") > 1 {
+			return 0, errors.New("Invalid format")
+		}
+
+		multiply_by_10 = true
+
+	}
+
+	c := string(price[len(price)-3:])
+	c = string(c[0:1])
+
+	/*
+		Extracts the third last char and checks if it's a "." or a ",".
+	*/
+	if "," == c {
+		if strings.Count(price, ",") > 1 {
+			return 0, errors.New("Invalid format")
+		}
+
+		multiply_by_100 = true
+
+	} else if "." == c {
+		if strings.Count(price, ".") > 1 {
+			return 0, errors.New("Invalid format")
+		}
+
+		multiply_by_100 = true
+
+	}
+
+	price = strings.Replace(price, ",", "", -1)
+	price = strings.Replace(price, ".", "", -1)
+
+	/*
+		Casts the price to integer in cents (not euro!).
+	*/
+	price_int, err := strconv.Atoi(price)
+	if err != nil {
+		return 0, err
+	}
+
+	if multiply_by_10 {
+		price_int = price_int * 10
+	} else if multiply_by_100 {
+		price_int = price_int * 100
+	}
+
+	return price_int, nil
+}
diff --git a/utilities.go b/utilities.go
deleted file mode 100644
index 02538fa..0000000
--- a/utilities.go
+++ /dev/null
@@ -1,28 +0,0 @@
-package main
-
-import (
-	"strings"
-)
-
-func sanitize_price(price string) int {
-	multiply_by_100 := false
-
-	price = strings.TrimSpace(price)
-
-	price = strings.TrimPrefix(price, "€")
-	price = strings.TrimSpace(price)
-
-	price = strings.TrimSuffix(price, "€")
-	price = strings.TrimSpace(price)
-
-	/*
-		Extracts the third last char and checks if it's a ",".
-	*/
-	//if ( rune(",") == []rune(price)[-3])
-	c := string(price[len(price)-3:])
-	c = string(c[0:1])
-
-	if "," == c {
-		multiply_by_100 = true
-	}
-}
-- 
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