add watcher for serving

cli.go

@@ -2,8 +2,11 @@ package builder
 
 import (
 	"fmt"
+	"log/slog"
 	"path/filepath"
 
+	"github.com/bmatcuk/doublestar/v4"
+	"github.com/fsnotify/fsnotify"
 	"github.com/labstack/echo/v4"
 	"github.com/labstack/echo/v4/middleware"
 )
@@ -28,11 +31,34 @@ func (c *CLI) Run() error {
 	}
 
 	if c.Serve {
+		watcher, err := fsnotify.NewWatcher()
+		if err != nil {
+			return fmt.Errorf("could not create file watcher: %w", err)
+		}
+		defer watcher.Close()
+
+		go func() {
+			for event := range watcher.Events {
+				matched, _ := doublestar.Match(filepath.Join(c.SourcePath, "**", "*.md"), event.Name)
+
+				if matched {
+					slog.Info("rebuilding markdown files")
+
+					_ = renderer.Execute()
+				}
+			}
+		}()
+
+		err = watcher.Add(c.SourcePath)
+		if err != nil {
+			return fmt.Errorf("could add watching path: %w", err)
+		}
+
 		e := echo.New()
 		e.Use(middleware.Logger())
 		e.Static("/", c.BuildPath)
 
-		err := e.Start(":8080")
+		err = e.Start(":8080")
 		if err != nil {
 			return fmt.Errorf("could not start serving: %w", err)
 		}

cmd/main.go

@@ -1,11 +1,16 @@
 package main
 
 import (
+	"log/slog"
+	"os"
+
 	"github.com/alecthomas/kong"
 	"github.com/jtarchie/builder"
 )
 
 func main() {
+	slog.SetDefault(slog.New(slog.NewJSONHandler(os.Stderr, nil)))
+
 	cli := &builder.CLI{}
 	ctx := kong.Parse(cli)
 	// Call the Run() method of the selected parsed command.

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/BurntSushi/toml v1.3.2 // indirect
 	github.com/alecthomas/chroma v0.10.0 // indirect
 	github.com/dlclark/regexp2 v1.10.0 // indirect
+	github.com/fsnotify/fsnotify v1.6.0 // indirect
 	github.com/go-logr/logr v1.2.4 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect

go.sum

@@ -17,6 +17,8 @@ github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/dlclark/regexp2 v1.4.0/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
 github.com/dlclark/regexp2 v1.10.0 h1:+/GIL799phkJqYW+3YbOd8LCcbHzT0Pbo8zl70MHsq0=
 github.com/dlclark/regexp2 v1.10.0/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
+github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
+github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
 github.com/go-logr/logr v1.2.4 h1:g01GSCwiDw2xSZfjJ2/T9M+S6pFdcNtFYsp+Y43HYDQ=
 github.com/go-logr/logr v1.2.4/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A=
 github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 h1:tfuBGBXKqDEevZMzYi5KSi8KkcZtzBcTgAUUtapy0OI=
@@ -90,6 +92,7 @@ golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211103235746-7861aae1554b/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220908164124-27713097b956/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
 golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=