feat(set): adds --file flag to input from a file path

README.md

@@ -140,6 +140,10 @@ echo "Alice" | pda set name
 cat dogs.txt | pda set dogs
 pda set kitty < cat.png
 
+# From a file
+pda set dogs --file dogs.txt
+pda set kitty -f cat.png
+
 # --safe to skip if the key already exists.
 pda set name "Alice" --safe
 pda set name "Bob" --safe

cmd/set.go

@@ -25,6 +25,7 @@ package cmd
 import (
 	"fmt"
 	"io"
+	"os"
 	"strings"
 	"time"
 
@@ -78,10 +79,23 @@ func set(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("cannot set '%s': %v", args[0], err)
 	}
 
+	filePath, err := cmd.Flags().GetString("file")
+	if err != nil {
+		return fmt.Errorf("cannot set '%s': %v", args[0], err)
+	}
+
 	var value []byte
-	if len(args) == 2 {
+	switch {
+	case filePath != "" && len(args) == 2:
+		return fmt.Errorf("cannot set '%s': --file and VALUE argument are mutually exclusive", args[0])
+	case filePath != "":
+		value, err = os.ReadFile(filePath)
+		if err != nil {
+			return fmt.Errorf("cannot set '%s': %v", args[0], err)
+		}
+	case len(args) == 2:
 		value = []byte(args[1])
-	} else {
+	default:
 		bytes, err := io.ReadAll(cmd.InOrStdin())
 		if err != nil {
 			return fmt.Errorf("cannot set '%s': %v", args[0], err)
@@ -169,4 +183,5 @@ func init() {
 	setCmd.Flags().BoolP("interactive", "i", false, "Prompt before overwriting an existing key")
 	setCmd.Flags().BoolP("encrypt", "e", false, "Encrypt the value at rest using age")
 	setCmd.Flags().Bool("safe", false, "Do not overwrite if the key already exists")
+	setCmd.Flags().StringP("file", "f", "", "Read value from a file")
 }

testdata/help-set.ct

@@ -22,6 +22,7 @@ Aliases:
 
 Flags:
   -e, --encrypt        Encrypt the value at rest using age
+  -f, --file string    Read value from a file
   -h, --help           help for set
   -i, --interactive    Prompt before overwriting an existing key
       --safe           Do not overwrite if the key already exists
@@ -48,6 +49,7 @@ Aliases:
 
 Flags:
   -e, --encrypt        Encrypt the value at rest using age
+  -f, --file string    Read value from a file
   -h, --help           help for set
   -i, --interactive    Prompt before overwriting an existing key
       --safe           Do not overwrite if the key already exists

testdata/set-file-conflict-err.ct

@@ -0,0 +1,3 @@
+$ fecho myfile contents
+$ pda set key@sfc value --file myfile --> FAIL
+FAIL  cannot set 'key@sfc': --file and VALUE argument are mutually exclusive

testdata/set-file.ct

@@ -0,0 +1,4 @@
+$ fecho myfile hello from file
+$ pda set key@sf --file myfile
+$ pda get key@sf
+hello from file