Allow omitting unit (#36)

* Add "s" to arg[0] if it was a number without unit

* Add default time unit information to README

README.md

@@ -6,7 +6,7 @@
 
 ---
 
-Timer is a small CLI, similar to the `sleep` everyone already knows and love, 
+Timer is a small CLI, similar to the `sleep` everyone already knows and love,
 with a couple of extra features:
 
 - a progress bar indicating the progression of said timer
@@ -22,6 +22,11 @@ man timer
 timer --help
 ```
 
+It is possible to pass a time unit for `<duration>`.
+
+Valid time units are "ns", "us" (or "µs"), "ms", "s", "m", "h".
+If no unit is passed, it defaults to seconds ("s").
+
 ## Install
 
 **homebrew**:

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"strconv"
 	"time"
 
 	"github.com/charmbracelet/bubbles/key"
@@ -112,6 +113,7 @@ var rootCmd = &coral.Command{
 	SilenceUsage: true,
 	Args:         coral.ExactArgs(1),
 	RunE: func(cmd *coral.Command, args []string) error {
+		addSuffixIfArgIsNumber(&(args[0]), "s")
 		duration, err := time.ParseDuration(args[0])
 		if err != nil {
 			return err
@@ -156,3 +158,10 @@ func main() {
 		os.Exit(1)
 	}
 }
+
+func addSuffixIfArgIsNumber(s *string, suffix string) {
+	_, err := strconv.ParseFloat(*s, 64)
+	if err == nil {
+		*s = *s + suffix
+	}
+}