From 7fb50e1cd63ae5e460b0aed686c5e4e32feda85f Mon Sep 17 00:00:00 2001
From: Matthias Kruk <m@m10k.eu>
Date: Sat, 3 Apr 2021 11:34:51 +0900
Subject: [PATCH] include/is: Add functions for determining the content of
 strings

This commit adds ctype.h-style functions for determining what kind of
data is stored in strings.
---
 include/is.sh | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 include/is.sh

diff --git a/include/is.sh b/include/is.sh
new file mode 100644
index 0000000..ac22f82
--- /dev/null
+++ b/include/is.sh
@@ -0,0 +1,77 @@
+#!bin/bash
+
+__init() {
+	return 0
+}
+
+is_digit() {
+	local str
+
+	str="$1"
+
+	if [[ "$str" =~ ^[0-9]+$ ]]; then
+		return 0
+	fi
+
+	return 1
+}
+
+is_hex() {
+	local str
+
+	str="$1"
+
+	if [[ "$str" =~ ^[0-9a-fA-F]+$ ]]; then
+		return 0
+	fi
+
+	return 1
+}
+
+is_upper() {
+	local str
+
+	str="$1"
+
+	if [[ "$str" =~ ^[A-Z]+$ ]]; then
+		return 0
+	fi
+
+	return 1
+}
+
+is_lower() {
+	local str
+
+	str="$1"
+
+	if [[ "$str" =~ ^[a-z]+$ ]]; then
+		return 0
+	fi
+
+	return 1
+}
+
+is_alpha() {
+	local str
+
+	str="$1"
+
+	if is_upper "$str" || is_lower "$str"; then
+		return 0
+	fi
+
+	return 1
+}
+
+is_alnum() {
+	local str
+
+	str="$1"
+
+	if is_alpha "$str" || is_digit "$str"; then
+		return 0
+	fi
+
+	return 1
+}
-- 
2.47.3