Merge pull request #29 from mudclient/style/lint

排版和重构代码，以提升代码质量

.github/workflows/build.yml

@@ -25,3 +25,6 @@ jobs:
 
     - name: Build
       run: go build -v .
+
+    - name: Lint
+      run: docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.23.3 golangci-lint run -v ./...

.golangci.yml

@@ -0,0 +1,30 @@
+service:
+    golangci-lint-version: 1.23.x
+    prepare:
+        - go mod tidy
+        - go generate ./...
+
+linters:
+    enable-all: true
+    disable:
+# 因为只有两行语句的 case 语句里面强制要求 return 语句换行会让整个 switch 很分裂。
+        - wsl
+# 因为连 1 都算 magic number 的话，许多循环就没法写了。
+# https://github.com/tommy-muehle/go-mnd/issues/3
+        - gomnd
+# 有些情况下错误不可避免：
+# https://github.com/alexkohler/dogsled/issues/2
+        - dogsled
+# V1.0 之前有 TODO/FIXME 很正常吧。
+        - godox
+# 有些情况下错误不可避免：
+# https://github.com/mvdan/unparam/issues/43
+        - unparam
+# 下面这两个 checker 太过激进，并不认同
+        - gochecknoglobals
+        - gochecknoinits
+
+linters-settings:
+    errcheck:
+        check-type-assertions: true
+        ignore: '[FS]?[Pp]rint(|f|ln)|Write'

README.md

@@ -16,6 +16,12 @@
 </a>
 <a href="https://github.com/mudclient/go-mud/actions?workflow=Build">
 <img alt="Build workflow" src="https://github.com/mudclient/go-mud/workflows/Build/badge.svg">
+</a>
+<a href="https://goreportcard.com/report/github.com/mudclient/go-mud">
+<img alt="Go Report" src="https://goreportcard.com/badge/github.com/mudclient/go-mud">
+</a>
+<a href="https://golangci.com/r/github.com/mudclient/go-mud">
+<img alt="GolangCI Report" src="https://github.com/golangci/golangci-web/blob/master/src/assets/images/badge_a_plus_flat.svg">
 </a>
     </p>
 </p>