add vim extension

Makefile

@@ -1,10 +1,23 @@
-build_x86:
-	GOOS=darwin GOARCH=amd64 go build -o formattag-amd64 main.go
+build_macOS_x86:
+	GOOS=darwin GOARCH=amd64 go build -o formattag-macOS-amd64 main.go
 
-build_m1:
-	GOOS=darwin GOARCH=arm64 go build -o formattag-arm64 main.go
+build_macOS_arm:
+	GOOS=darwin GOARCH=arm64 go build -o formattag-macOS-arm64 main.go
 
-build: build_x86 build_m1
+build_macOS: build_macOS_arm build_macOS_x86
+
+build_linux_x86:
+	GOOS=linux GOARCH=amd64 go build -o formattag-linux-amd64 main.go
+
+build_linux_arm64:
+	GOOS=linux GOARCH=arm64 go build -o formattag-linux-arm64 main.go
+
+build_linux_386:
+	GOOS=linux GOARCH=386 go build -o formattag-linux-386 main.go
+
+build_linux: build_linux_386 build_linux_arm64 build_linux_x86 
+
+build: build_linux build_macOS
 
 tar:
-	tar zcvf formattag.tar.gz formattag-amd64 formattag-arm64 
+	tar zcvf formattag.tar.gz formattag-macOS-amd64 formattag-macOS-arm64  formattag-linux-amd64 formattag-linux-arm64 formattag-linux-386

vim/ftplugin/go/pretty.vim

@@ -0,0 +1,25 @@
+" Copyright 2021 momaek. All rights reserved.
+" Use of this source code is governed by a BSD-style
+" license that can be found in the LICENSE file.
+"
+" This filetype plugin add a new commands for go buffers:
+"
+"   :PrettyTag
+"
+"       Run formattag for the current Go file.
+"
+if exists("b:did_ftplugin_go_pretty_tag")
+    finish
+endif
+
+if !executable("formattag")
+    finish
+endif
+
+command! -buffer PrettyTag call s:GoPrettyTag()
+
+function! s:GoPrettyTag() abort
+    cexpr system('formattag -file ' . shellescape(expand('%')))
+endfunction
+
+let b:did_ftplugin_go_pretty_tag = 1