今天要介绍一个比较好用的go应用的自动热加载工具: air，有了它，再也不用手动 Ctrl+C + go run了，它还有以下特性：
- Colorful log output
- Customize build or binary command
- Support excluding subdirectories
- Allow watching new directories after Air started
- Better building process
安装
go get -u github.com/cosmtrek/air
然后在项目根目录新建 .air.toml文件
我的是windows机器，其他系统可以参考github原配置文件
# Config file for [Air](https://github.com/cosmtrek/air) in TOML format
# Working directory
# . or absolute path, please note that the directories following must be under root.
root = "."
tmp_dir = "tmp"
[build]
# Just plain old shell command. You could use `make` as well.
# go build -o ./tmp/main .
cmd = "go build -o ./tmp/main ."
# Binary file yields from `cmd`.
bin = "tmp/main"
# Customize binary. APP_ENV=dev APP_USER=air ./tmp/main
full_bin = "./tmp/main"
# Watch these filename extensions.
include_ext = ["go", "tpl", "tmpl", "html"]
# Ignore these filename extensions or directories.
exclude_dir = ["assets", "tmp", "vendor"]
# Watch these directories if you specified.
include_dir = []
# Exclude files.
exclude_file = []
# This log file places in your tmp_dir.
log = "air.log"
# It's not necessary to trigger build each time file changes if it's too frequent.
delay = 1000 # ms
# Stop running old binary when build errors occur.
stop_on_error = true
# Send Interrupt signal before killing process (windows does not support this feature)
send_interrupt = false
# Delay after sending Interrupt signal
kill_delay = 500 # ms
[log]
# Show log time
time = false
[color]
# Customize each part's color. If no color found, use the raw app log.
main = "magenta"
watcher = "cyan"
build = "yellow"
runner = "green"
[misc]
# Delete tmp directory on exit
clean_on_exit = true
到此就完成了配置，终端输入 air 就可以启动了，gin框架搭配air很适合，其他框架还没有试过
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