From bbbff6689b0db153da496d9c2722023bd43ed589 Mon Sep 17 00:00:00 2001
From: Amy Boyd <amy@amyboyd.co.uk>
Date: Mon, 4 Jul 2016 17:25:40 +0100
Subject: [PATCH] Add line fixers: FixTabIndentationToSpaces,
 FixTabIndentationToSpaces, FixTabIndentationToSpaces.

---
 editorconfig/line_fixers.go      | 55 ++++++++++++++++++++++++
 editorconfig/line_fixers_test.go | 72 ++++++++++++++++++++++++++++++++
 2 files changed, 127 insertions(+)
 create mode 100644 editorconfig/line_fixers.go
 create mode 100644 editorconfig/line_fixers_test.go

diff --git a/editorconfig/line_fixers.go b/editorconfig/line_fixers.go
new file mode 100644
index 0000000..9351e37
--- /dev/null
+++ b/editorconfig/line_fixers.go
@@ -0,0 +1,55 @@
+package editorconfig
+
+import (
+	"strconv"
+	"strings"
+)
+
+type LineFixer func(ruleValue string, line string) string
+
+func FixTabIndentationToSpaces(ruleValueNumberOfSpaces string, line string) string {
+	numberOfSpaces, _ := strconv.Atoi(ruleValueNumberOfSpaces)
+
+	line = indentedWithTabsRegexp.ReplaceAllStringFunc(line, func(tabs string) string {
+		return strings.Repeat(" ", len(tabs)*numberOfSpaces)
+	})
+
+	return line
+}
+
+func FixMixedIndentationToSpaces(ruleValueNumberOfSpaces string, line string) string {
+	numberOfSpaces, _ := strconv.Atoi(ruleValueNumberOfSpaces)
+
+	for indentedWithMixedTabsAndSpacesRegexp.MatchString(line) {
+		line = indentedWithMixedTabsAndSpacesRegexp.ReplaceAllStringFunc(line, func(tabsAndSpaces string) string {
+			tabs := strings.Replace(tabsAndSpaces, " ", "", -1)
+			spaces := strings.Replace(tabsAndSpaces, "\t", "", -1)
+
+			return strings.Repeat(" ", (len(tabs)*numberOfSpaces)+len(spaces))
+		})
+	}
+
+	return line
+}
+
+func FixUndividableIndentationToNearestSpacesAmount(ruleValueNumberOfSpaces string, line string) string {
+	numberOfSpaces, _ := strconv.Atoi(ruleValueNumberOfSpaces)
+	if numberOfSpaces < 1 {
+		ExitBecauseOfInternalError("Number of spaces must be integer greater than 0, is: " + ruleValueNumberOfSpaces)
+	}
+
+	if GetNumberOfLeftSpaces(line) == 0 {
+		return line
+	}
+
+	for true {
+		leftSpaces := GetNumberOfLeftSpaces(line)
+		if leftSpaces%numberOfSpaces != 0 {
+			line = " " + line
+		} else {
+			break
+		}
+	}
+
+	return line
+}
diff --git a/editorconfig/line_fixers_test.go b/editorconfig/line_fixers_test.go
new file mode 100644
index 0000000..ba7e569
--- /dev/null
+++ b/editorconfig/line_fixers_test.go
@@ -0,0 +1,72 @@
+package editorconfig
+
+import (
+	"testing"
+)
+
+func TestFixTabIndentationToSpaces(t *testing.T) {
+	var result string
+
+	result = FixTabIndentationToSpaces("4", "\t\thello world")
+	if result != "        hello world" {
+		t.Error("Unexpected result: " + result)
+	}
+
+	result = FixTabIndentationToSpaces("3", "\thello world")
+	if result != "   hello world" {
+		t.Error("Unexpected result: " + result)
+	}
+
+	result = FixTabIndentationToSpaces("2", "\t\t\thello world")
+	if result != "      hello world" {
+		t.Error("Unexpected result: " + result)
+	}
+}
+
+func TestFixMixedIndentationToSpaces(t *testing.T) {
+	var result string
+
+	result = FixMixedIndentationToSpaces("2", "\t  \t  hello worl d")
+	if result != "        hello worl d" {
+		t.Error("Unexpected result: " + result)
+	}
+
+	result = FixMixedIndentationToSpaces("3", " \thello world  !")
+	if result != "    hello world  !" {
+		t.Error("Unexpected result: " + result)
+	}
+
+	result = FixMixedIndentationToSpaces("2", "  \t hello world !")
+	if result != "     hello world !" {
+		t.Error("Unexpected result: " + result)
+	}
+}
+
+func TestFixUndividableIndentationToNearestSpacesAmount(t *testing.T) {
+	var result string
+
+	result = FixUndividableIndentationToNearestSpacesAmount("2", "hello")
+	if result != "hello" {
+		t.Error("String changed but it was already fine. Changed to: " + result)
+	}
+
+	result = FixUndividableIndentationToNearestSpacesAmount("2", "  hello")
+	if result != "  hello" {
+		t.Error("String changed but it was already fine. Changed to: " + result)
+	}
+
+	result = FixUndividableIndentationToNearestSpacesAmount("1", "  hello")
+	if result != "  hello" {
+		t.Error("String changed but it was already fine. Changed to: " + result)
+	}
+
+	result = FixUndividableIndentationToNearestSpacesAmount("3", "  hello")
+	if result != "   hello" {
+		t.Error("Unexpected result: " + result)
+	}
+
+	result = FixUndividableIndentationToNearestSpacesAmount("5", "  hello")
+	if result != "     hello" {
+		t.Error("Unexpected result: " + result)
+	}
+}