Implement initial server-side code

src/sync/common.go

@@ -0,0 +1,58 @@
+package sync
+
+import (
+	"fmt"
+	"github.com/rwinkhart/MUTN/src/backend"
+	"io/fs"
+	"os"
+	"path/filepath"
+)
+
+// WalkEntryDir walks the entry directory and returns lists of all files and directories found (two separate lists)
+// initCommand is used to specify to the end user how to generate the entry directory if it does not exists
+func WalkEntryDir() ([]string, []string) {
+	// define file/directory containing slices so that they may be accessed by the anonymous WalkDir function
+	var fileList []string
+	var dirList []string
+
+	// walk entry directory
+	_ = filepath.WalkDir(backend.EntryRoot,
+		func(fullPath string, entry fs.DirEntry, err error) error {
+
+			// check for errors encountered while walking directory
+			if err != nil {
+				if os.IsNotExist(err) {
+					fmt.Println(backend.AnsiError+"The entry directory does not exist - run \""+os.Args[0], "init"+"\" to create it"+backend.AnsiReset) // TODO implement init command for libmuttonserver
+				} else {
+					// otherwise, print the source of the error
+					fmt.Println(backend.AnsiError + "An unexpected error occurred while generating the entry list: " + err.Error() + backend.AnsiReset)
+				}
+				os.Exit(1)
+			}
+
+			// trim root path from each path before storing
+			trimmedPath := fullPath[rootLength:]
+
+			// create separate slices for entries and directories
+			if !entry.IsDir() {
+				fileList = append(fileList, trimmedPath)
+			} else {
+				dirList = append(dirList, trimmedPath)
+			}
+
+			return nil
+		})
+
+	return fileList, dirList
+}
+
+func getModTimes(entryList []string) []int64 {
+	// get a list of all entry modification times
+	var modList []int64
+	for _, file := range entryList {
+		modTime, _ := os.Stat(backend.EntryRoot + file)
+		modList = append(modList, modTime.ModTime().Unix())
+	}
+
+	return modList
+}