From e39c47c631de62366153f0a4b3df3df7ead677c5 Mon Sep 17 00:00:00 2001
From: Philip Wittamore <philip@wittamore.com>
Date: Fri, 16 May 2025 23:44:06 +0200
Subject: update

---
 pb | 31 ++++++++++---------------------
 1 file changed, 10 insertions(+), 21 deletions(-)

(limited to 'pb')

diff --git a/pb b/pb
index 3bbfe66..12a366c 100755
--- a/pb
+++ b/pb
@@ -1,24 +1,13 @@
 #!/usr/bin/env bash
 
-# is int
-pb_isint() { 
-  if [[ $1 =~ ^[0-9]+$ ]] ; then
-    return 0
-  else
-    return 1
-  fi
-}
-
-# is number
-pb_isnum() { 
-  if [[ $1 =~ ^[+-]?([0-9]+([.][0-9]*)?|\.[0-9]+)$ ]] ; then
-    return 0
-  else
-    return 1
-  fi
-}
-
-# 256 colour functions 
+#--- is number functions
+# https://stackoverflow.com/questions/806906/how-do-i-test-if-a-variable-is-a-number-in-bash/806923#806923
+pb_isuint() { case $1        in '' | *[!0-9]*              ) return 1;; esac ;}
+pb_isint()  { case ${1#[-+]} in '' | *[!0-9]*              ) return 1;; esac ;}
+pb_isunum() { case $1        in '' | . | *[!0-9.]* | *.*.* ) return 1;; esac ;}
+pb_isnum()  { case ${1#[-+]} in '' | . | *[!0-9.]* | *.*.* ) return 1;; esac ;}
+
+#--- 256 colour functions 
 # usage:
 #  source ./pb
 #  printf %b "$(pb_bg 196)$(pb_fg 254) RED $(pb_nc)\n"
@@ -30,7 +19,7 @@ pb_nc() {
 
 pb_fg() {
 
-  if [ -z "$1" ] || ! pb_isint "$1" ; then
+  if [ -z "$1" ] || ! pb_isuint "$1" ; then
     return 1
   fi
   
@@ -47,7 +36,7 @@ pb_fg() {
 
 pb_bg() {
 
-  if [ -z "$1" ] || ! pb_isint $1 ; then
+  if [ -z "$1" ] || ! pb_isuint $1 ; then
     return 1
   fi
 
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