From 51e339ce74633c409db08c4b528bf80f97e16a9e Mon Sep 17 00:00:00 2001
From: ADAM David Alan Martin <adam@recursive.engineer>
Date: Fri, 15 Apr 2022 15:31:44 -0400
Subject: [PATCH] Fix prompt shuffling when `shuf` is not found.

---
 tcshrc.prompt.defs  |  5 +++++
 tcshrc.prompt.final | 17 ++++++++++++++---
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/tcshrc.prompt.defs b/tcshrc.prompt.defs
index 2efd9d4..d95a60e 100644
--- a/tcshrc.prompt.defs
+++ b/tcshrc.prompt.defs
@@ -6,6 +6,11 @@ if( $?CSHENV_DEBUG ) then
 	echo "Sourcing prompt setup and definitions..."
 endif
 
+which shuf >& /dev/null
+if( $? == 0 ) then
+    setenv CSHENV_DETECTED_SHUF
+endif
+
 if( ! $?unknown_tty ) then
 	set unknown_tty="?"
 	if( $?CSHENV_DEBUG ) then
diff --git a/tcshrc.prompt.final b/tcshrc.prompt.final
index 9db349c..9800044 100644
--- a/tcshrc.prompt.final
+++ b/tcshrc.prompt.final
@@ -16,7 +16,13 @@ if( ${prompt_hcolor} == 0 ) then
         #echo colorshuffle
     #endif
     #echo 
-    set reference_colors=`shuf -e $reference_colors`
+    # Shuffle, if supported
+    if( $?CSHENV_DETECTED_SHUF ) then
+        set reference_colors=`shuf -e $reference_colors`
+    else
+        #echo "FALLBACK COLOR!"
+        set reference_colors=`echo $reference_colors | sed -e 's/ /\n/' | sort -R | xargs`
+    endif
 endif
     
 
@@ -25,8 +31,13 @@ if( ${prompt_hsym} == 0 ) then # && ${prompt_hcolor} == 0 ) then
         echo symbolshuffle
     endif
     #echo 
-    set referencechars=`shuf -e $referencechars`
-    #set reference_colors=`shuf -e $reference_colors`
+    if( $?CSHENV_DETECTED_SHUF ) then
+        set referencechars=`shuf -e $referencechars`
+        #set reference_colors=`shuf -e $reference_colors`
+    else
+        #echo "FALLBACK CHAR!"
+        set referencechars=`echo $referencechars | sed -e 's/ /\n/' | sort -R | xargs` 
+    endif
 endif
 
 @ prompt_hcolor = ${prompt_hcolor} + 1