From 0fd96b0d487aa469b9dd1bbd2dd489806f5244ec Mon Sep 17 00:00:00 2001
From: Amy Boyd <amy@amyboyd.co.uk>
Date: Fri, 24 Jun 2016 21:31:19 +0100
Subject: [PATCH] Add 'check' command with support for indent style/size,
 trailing whitespace.

---
 bin/run-check                 |  2 ++
 editorconfig/check_command.go | 51 +++++++++++++++++++++++++++++++++++
 editorconfig/cli.go           |  5 ++++
 3 files changed, 58 insertions(+)
 create mode 100755 bin/run-check
 create mode 100644 editorconfig/check_command.go

diff --git a/bin/run-check b/bin/run-check
new file mode 100755
index 0000000..3832347
--- /dev/null
+++ b/bin/run-check
@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+go run main.go check editorconfig/tests/
diff --git a/editorconfig/check_command.go b/editorconfig/check_command.go
new file mode 100644
index 0000000..77e3222
--- /dev/null
+++ b/editorconfig/check_command.go
@@ -0,0 +1,51 @@
+package editorconfig
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/codegangsta/cli"
+	"os"
+	"strconv"
+)
+
+func CheckCommand(c *cli.Context) error {
+	files, err := FindSourceFiles(c.Args())
+	if err != nil {
+		return err
+	}
+
+	configs := FindConfigFiles(files)
+
+	for _, f := range files {
+		fh, err := os.Open(f)
+		if err != nil {
+			ExitBecauseOfInternalError("Could not read file: " + f)
+		}
+
+		// @todo - add "full file checkers" for end_of_line, insert_final_newline and charset.
+
+		scanner := bufio.NewScanner(fh)
+		rules := GetRulesToApplyToSourcePath(f, configs)
+
+		lineNo := 0
+		for scanner.Scan() {
+			line := scanner.Text()
+			lineNo++
+
+			for ruleName, ruleValue := range rules {
+				if lineCheckers[ruleName] == nil {
+					continue
+				}
+
+				result := lineCheckers[ruleName](ruleValue, line)
+				if !result.isOk {
+					fmt.Println(f + ": line " + strconv.Itoa(lineNo) + ": " + ruleName + ": " + result.messageIfNotOk)
+					// Don't show more than 1 error per line.
+					break
+				}
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/editorconfig/cli.go b/editorconfig/cli.go
index 711e7cd..ac7ab43 100644
--- a/editorconfig/cli.go
+++ b/editorconfig/cli.go
@@ -22,6 +22,11 @@ func CreateCliApp() *cli.App {
 			Usage:  "List rules that match a given file",
 			Action: RulesCommand,
 		},
+		{
+			Name:   "check",
+			Usage:  "Validate files",
+			Action: CheckCommand,
+		},
 	}
 
 	return app