Add BLE FS to API package

internal/types/types.go

@@ -1,5 +1,10 @@
 package types
 
+import (
+	"fmt"
+	"strconv"
+)
+
 const (
 	ReqTypeHeartRate = iota
 	ReqTypeBattLevel
@@ -33,9 +38,9 @@ const (
 )
 
 type ReqDataFS struct {
-	Type  int `json:"type"`
+	Type  int      `json:"type"`
 	Files []string `json:"files"`
-	Data  string `json:"data,omitempty"`
+	Data  string   `json:"data,omitempty"`
 }
 
 type ReqDataFwUpgrade struct {
@@ -74,8 +79,64 @@ type MotionValues struct {
 }
 
 type FileInfo struct {
-	Name string `json:"name"`
-	Size int64 `json:"size"`
-	IsDir bool `json:"isDir"`
-	
-}
+	Name  string `json:"name"`
+	Size  int64  `json:"size"`
+	IsDir bool   `json:"isDir"`
+}
+
+func (fi FileInfo) String() string {
+	var isDirChar rune
+	if fi.IsDir {
+		isDirChar = 'd'
+	} else {
+		isDirChar = '-'
+	}
+
+	// Get human-readable value for file size
+	val, unit := bytesHuman(fi.Size)
+	prec := 0
+	// If value is less than 10, set precision to 1
+	if val < 10 {
+		prec = 1
+	}
+	// Convert float to string
+	valStr := strconv.FormatFloat(val, 'f', prec, 64)
+
+	// Return string formatted like so:
+	// -  10 kB file
+	// or:
+	// d   0 B  .
+	return fmt.Sprintf(
+		"%c %3s %-2s %s",
+		isDirChar,
+		valStr,
+		unit,
+		fi.Name,
+	)
+}
+
+// bytesHuman returns a human-readable string for
+// the amount of bytes inputted.
+func bytesHuman(b int64) (float64, string) {
+	const unit = 1000
+	// Set possible units prefixes (PineTime flash is 4MB)
+	units := [2]rune{'k', 'M'}
+	// If amount of bytes is less than smallest unit
+	if b < unit {
+		// Return unchanged with unit "B"
+		return float64(b), "B"
+	}
+
+	div, exp := int64(unit), 0
+	// Get decimal values and unit prefix index
+	for n := b / unit; n >= unit; n /= unit {
+		div *= unit
+		exp++
+	}
+
+	// Create string for full unit
+	unitStr := string([]rune{units[exp], 'B'})
+
+	// Return decimal with unit string
+	return float64(b) / float64(div), unitStr
+}