1 files changed, 75 insertions, 0 deletions
diff --git a/restore.go b/restore.go
new file mode 100644
index 0000000..f99196a
--- /dev/null
+++ b/restore.go
@@ -0,0 +1,75 @@
+/* Restore from a series of restic snapshots. */
+package main
+
+import (
+	"fmt"
+	"os"
+	"io"
+	"log"
+	"strings"
+	"slices"
+)
+
+type Snapshot struct {
+	id string
+	dirs []string
+}
+
+func main() {
+	body, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	var shots []Snapshot
+	var current Snapshot
+	
+	lines := strings.Split(string(body), "\n")
+	for _, s := range lines[2:len(lines) - 3] {
+		split := strings.Split(s, " ")
+		if len(s) == 0 {
+			shots = append(shots, current)
+			// Old snapshot is garbage collected.
+			current = Snapshot{}
+		} else if s[0] == ' ' {
+			// Directory at the end of line.
+			current.dirs = append(current.dirs, split[len(split) - 1])
+		} else {
+			// New snapshot.
+			current.id = split[0]
+			current.dirs = []string{split[len(split) - 1]}
+		}
+	}
+
+	// Last not followed by blank line.
+	shots = append(shots, current)
+
+	/*
+	for _, shot := range shots {
+		fmt.Println(shot.id)
+		for _, dir := range shot.dirs {
+			fmt.Println("\t" + dir)
+		}
+	} */
+
+	/* Traverse through the snapshots in reverse order.
+	The earlier entries covered by current are removed. */
+	seen := []string{}
+	list := make(map[string]string)
+	for i := len(shots) - 1; i >= 0; i-- {
+		for _, dir := range(shots[i].dirs) {
+			if !slices.Contains(seen, dir) {
+				seen = append(seen, dir)
+				list[shots[i].id] += dir + ","
+			}
+		}
+	}
+
+	for id, paths := range list {
+		for _, dir := range strings.Split(paths, ",") {
+			if dir != "" {
+				fmt.Println("restic restore " + id + ":" + dir + " --overwrite=if-newer --target=" + dir)
+			}
+		}
+	}
+}