1 files changed, 41 insertions, 0 deletions
diff --git a/util/number_parser.go b/util/number_parser.go
new file mode 100644
index 0000000..de46160
--- /dev/null
+++ b/util/number_parser.go
@@ -0,0 +1,41 @@
+/*
+macli - Unofficial CLI-Based MyAnimeList Client
+Copyright © 2022 Vidhu Kant Sharma <vidhukant@vidhukant.xyz>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package util
+
+import (
+  "fmt"
+  "os"
+  "strconv"
+)
+
+func ParseNumeric(input string, prevValue int) int {
+  inputInt, err := strconv.Atoi(input)
+  if err != nil {
+    fmt.Println("Error while parsing input", err)
+    os.Exit(1)
+  }
+
+  switch input[0:1] {
+  case "+", "-":
+    // works both for increment and decrement
+    return prevValue + inputInt
+  default:
+    return inputInt
+  }
+}