From ff4ca68dfd54771aab5a1b07918aaea7237fbaaa Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sun, 11 Aug 2024 21:46:08 +0300
Subject: add IntFromENV

---
 internal/config/config.go      | 23 +++++++++++++++++++++++
 internal/config/config_test.go | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)

(limited to 'internal/config')

diff --git a/internal/config/config.go b/internal/config/config.go
index d697434..e078bed 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"io"
 	"os"
+	"strconv"
 	"unicode"
 )
 
@@ -42,6 +43,28 @@ func FromENV(keys ...string) string {
 	return ""
 }
 
+func IntFromENV(keys ...any) int {
+	for _, key := range keys {
+		switch key := key.(type) {
+		case string:
+			if key == "" || !isAllUpperCase(key) {
+				continue
+			}
+			strValue := os.Getenv(key)
+			if strValue == "" {
+				continue
+			}
+			if value, err := strconv.Atoi(strValue); err == nil {
+				return value
+			}
+		case int:
+			return key
+		}
+	}
+
+	return 0
+}
+
 func isAllUpperCase(s string) bool {
 	for _, r := range s {
 		if unicode.IsLetter(r) && !unicode.IsUpper(r) {
diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index f22b336..e1329d3 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -41,6 +41,42 @@ func TestFromENV(t *testing.T) {
 	t.Logf("got '%s' as expected", expected)
 }
 
+func TestIntFromENV(t *testing.T) {
+	t.Parallel()
+
+	os.Setenv("GOS_TEST_INT_FROM_ENV", "1")
+
+	var (
+		expected = 1
+		got      = IntFromENV(t, "GOS_TEST_INT_FROM_ENV")
+	)
+
+	if got != expected {
+		t.Errorf("got '%d' but expected '%d'", got, expected)
+	}
+	t.Logf("got '%d' as expected", expected)
+
+	expected = 999
+	got = IntFromENV("GOS_JAJAJA", expected)
+	if got != expected {
+		t.Errorf("got '%d' but expected '%d'", got, expected)
+	}
+	t.Logf("got '%d' as expected", expected)
+
+	os.Unsetenv("JUJUJU_NOT_EXISTANT_ENV")
+	if got = IntFromENV("JUJUJU_NOT_EXISTANT_ENV"); got != 0 {
+		t.Errorf("got '%d' but expected zero", got)
+	}
+	t.Logf("got zero as expected")
+
+	expected = 1234
+	got = IntFromENV("GOS_WATCH", "", "", "", expected, "")
+	if got != expected {
+		t.Errorf("got '%d' but expected '%d'", got, expected)
+	}
+	t.Logf("got '%d' as expected", expected)
+}
+
 func TestSecondENV(t *testing.T) {
 	t.Parallel()
 
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