bkli fix format selection by output filename

cmd/bkli/main.go

@@ -3,7 +3,9 @@ package main
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 	"runtime/debug"
+	"strings"
 
 	"github.com/gopatchy/bkl"
 	"github.com/jessevdk/go-flags"
@@ -39,10 +41,15 @@ func main() {
 	}
 
 	format := ""
+
 	if opts.OutputFormat != nil {
 		format = *opts.OutputFormat
 	}
 
+	if format == "" && opts.OutputPath != nil {
+		format = strings.TrimPrefix(filepath.Ext(*opts.OutputPath), ".")
+	}
+
 	var docs []any
 
 	for p, path := range opts.Positional.InputPaths {

tests/intersect-file-type/a.yaml

@@ -0,0 +1,3 @@
+a: 1
+b: 2
+c: 3

tests/intersect-file-type/b.yaml

@@ -0,0 +1,3 @@
+a: 1
+b: 10
+d: 4

tests/intersect-file-type/cmd

@@ -0,0 +1,4 @@
+bkli -o out.json a.yaml b.yaml
+echo X
+cat out.json
+rm -f out.json

tests/intersect-file-type/expected

@@ -0,0 +1,2 @@
+X
+{"a":1,"b":"$required"}