From 43fcf43d1fd3e34b6bad9cecd5d18ac1826032c5 Mon Sep 17 00:00:00 2001
From: Thomas von Dein <tom@vondein.org>
Date: Mon, 18 Nov 2024 13:18:51 +0100
Subject: [PATCH] add time support

---
 calc.go                  | 11 ++++++++++-
 calc_test.go             |  6 ++++--
 main.go                  |  2 +-
 rpn.go                   |  3 ++-
 rpn.pod                  |  3 ++-
 t/cmdlinecalc-time.txtar |  2 ++
 6 files changed, 21 insertions(+), 6 deletions(-)
 create mode 100644 t/cmdlinecalc-time.txtar

diff --git a/calc.go b/calc.go
index 4d52c7a..c108af9 100644
--- a/calc.go
+++ b/calc.go
@@ -272,9 +272,18 @@ func (c *Calc) EvalItem(item string) error {
 		return nil
 	}
 
+	// try time
+	var hour, min int
+	_, err = fmt.Sscanf(item, "%d:%d", &hour, &min)
+	if err == nil {
+		c.stack.Backup()
+		c.stack.Push(float64(hour) + float64(min)/60)
+
+		return nil
+	}
+
 	// try hex
 	var i int
-
 	_, err = fmt.Sscanf(item, "0x%x", &i)
 	if err == nil {
 		c.stack.Backup()
diff --git a/calc_test.go b/calc_test.go
index c4c6a7c..550f975 100644
--- a/calc_test.go
+++ b/calc_test.go
@@ -381,7 +381,7 @@ func FuzzEval(f *testing.F) {
 
 	calc := NewCalc()
 
-	var hexnum int
+	var hexnum, hour, min int
 
 	f.Fuzz(func(t *testing.T, line string) {
 		t.Logf("Stack:\n%v\n", calc.stack.All())
@@ -391,6 +391,7 @@ func FuzzEval(f *testing.F) {
 			if !contains(legal, line) && len(line) > 0 {
 				item := strings.TrimSpace(calc.Comment.ReplaceAllString(line, ""))
 				_, hexerr := fmt.Sscanf(item, "0x%x", &hexnum)
+				_, timeerr := fmt.Sscanf(item, "%d:%d", &hour, &min)
 				// no comment?
 				if len(item) > 0 {
 					// no known command or function?
@@ -405,7 +406,8 @@ func FuzzEval(f *testing.F) {
 							!exists(calc.StackCommands, item) &&
 							!calc.Register.MatchString(item) &&
 							item != "?" && item != "help" &&
-							hexerr != nil {
+							hexerr != nil &&
+							timeerr != nil {
 							t.Errorf("Fuzzy input accepted: <%s>", line)
 						}
 					}
diff --git a/main.go b/main.go
index 510313d..7efae04 100644
--- a/main.go
+++ b/main.go
@@ -30,7 +30,7 @@ import (
 	lua "github.com/yuin/gopher-lua"
 )
 
-const VERSION string = "2.1.2"
+const VERSION string = "2.1.3"
 
 const Usage string = `This is rpn, a reverse polish notation calculator cli.
 
diff --git a/rpn.go b/rpn.go
index 59763ce..68d5e7b 100644
--- a/rpn.go
+++ b/rpn.go
@@ -108,7 +108,8 @@ DESCRIPTION
     is enabled automatically, see last example.
 
     You can enter integers, floating point numbers (positive or negative) or
-    hex numbers (prefixed with 0x).
+    hex numbers (prefixed with 0x). Time values in hh::mm format are
+    possible as well.
 
   STACK MANIPULATION
     There are lots of stack manipulation commands provided. The most
diff --git a/rpn.pod b/rpn.pod
index 6e16dcd..bffecbc 100644
--- a/rpn.pod
+++ b/rpn.pod
@@ -112,7 +112,8 @@ If the first parameter to rpn is a math operator or function, batch
 mode is enabled automatically, see last example.
 
 You can enter integers, floating  point numbers (positive or negative)
-or hex numbers (prefixed with 0x).
+or hex  numbers (prefixed with 0x).  Time values in hh::mm  format are
+possible as well.
 
 =head2 STACK MANIPULATION
 
diff --git a/t/cmdlinecalc-time.txtar b/t/cmdlinecalc-time.txtar
new file mode 100644
index 0000000..3658eeb
--- /dev/null
+++ b/t/cmdlinecalc-time.txtar
@@ -0,0 +1,2 @@
+exec testrpn 09:55 4:15 -
+stdout '5.67\n'