patched rainbow text

Qortal-Setup-Linux.sh

@@ -11,31 +11,38 @@ NC='\033[0m'
 
 render_gradient_string() {
     local input="$1"
-    local regex='#([0-9a-fA-F]{6})(.)'
-    while [[ "$input" =~ $regex ]]; do
+    local regex='^#([0-9a-fA-F]{6})(.)'
+    local rest
+
+    while [[ -n "$input" ]]; do
+        if [[ "$input" =~ $regex ]]; then
             color="${BASH_REMATCH[1]}"
             char="${BASH_REMATCH[2]}"
             r=$((16#${color:0:2}))
             g=$((16#${color:2:2}))
             b=$((16#${color:4:2}))
             printf "\e[38;2;%d;%d;%dm%s" "$r" "$g" "$b" "$char"
-        input="${input#"#${color}${char}"}"
+            input="${input:9}"  # strip exactly 7 (color) + 1 (char) = 8 chars, plus 1 for #
+        else
+            printf "%s" "${input:0:1}"
+            input="${input:1}"
+        fi
     done
+
     echo -e "\e[0m"
 }
 
 
+
 rainbowize_text() {
     local text="$1"
     local freq=0.15
     local i=0
-    local output=""
     local pi=3.14159265
+    local output=""
 
     clamp() {
-        local val="$1"
-        local min="$2"
-        local max="$3"
+        local val="$1" min="$2" max="$3"
         if (( val < min )); then echo "$min"
         elif (( val > max )); then echo "$max"
         else echo "$val"
@@ -45,6 +52,7 @@ rainbowize_text() {
     while IFS= read -r line || [ -n "$line" ]; do
         for (( j=0; j<${#line}; j++ )); do
             char="${line:$j:1}"
+
             r=$(awk -v i="$i" -v f="$freq" 'BEGIN { printf("%d", 127 * (sin(f*i + 0) + 1)) }')
             g=$(awk -v i="$i" -v f="$freq" 'BEGIN { printf("%d", 127 * (sin(f*i + 2*3.1415/3) + 1)) }')
             b=$(awk -v i="$i" -v f="$freq" 'BEGIN { printf("%d", 127 * (sin(f*i + 4*3.1415/3) + 1)) }')
@@ -53,14 +61,10 @@ rainbowize_text() {
             g=$(clamp "$g" 50 230)
             b=$(clamp "$b" 50 230)
 
-            rh=$(printf "%02x" "$r")
-            gh=$(printf "%02x" "$g")
-            bh=$(printf "%02x" "$b")
-
-            output+="#${rh}${gh}${bh}${char}"
+            output+="#$(printf '%02x%02x%02x' "$r" "$g" "$b")$char"
             ((i++))
         done
-        output+=$'\n'  # Important!
+        output+=$'\n'
     done <<< "$text"
 
     echo -ne "$output"
@@ -69,6 +73,7 @@ rainbowize_text() {
 
 
 
+
 # rainbowize_text() {
 #     local text="$1"
 #     local freq=0.15