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zsh/.oh-my-zsh/lib/spectrum.zsh

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+# A script to make using 256 colors in zsh less painful.
+# P.C. Shyamshankar <sykora@lucentbeing.com>
+# Copied from https://github.com/sykora/etc/blob/master/zsh/functions/spectrum/
+
+typeset -AHg FX FG BG
+
+FX=(
+  reset     "%{%}"
+  bold      "%{%}" no-bold      "%{%}"
+  italic    "%{%}" no-italic    "%{%}"
+  underline "%{%}" no-underline "%{%}"
+  blink     "%{%}" no-blink     "%{%}"
+  reverse   "%{%}" no-reverse   "%{%}"
+)
+
+for color in {000..255}; do
+  FG[$color]="%{[38;5;${color}m%}"
+  BG[$color]="%{[48;5;${color}m%}"
+done
+
+# Show all 256 colors with color number
+function spectrum_ls() {
+  local ZSH_SPECTRUM_TEXT=${ZSH_SPECTRUM_TEXT:-Arma virumque cano Troiae qui primus ab oris}
+  for code in {000..255}; do
+    print -P -- "$code: $FG[$code]$ZSH_SPECTRUM_TEXT%{$reset_color%}"
+  done
+}
+
+# Show all 256 colors where the background is set to specific color
+function spectrum_bls() {
+  local ZSH_SPECTRUM_TEXT=${ZSH_SPECTRUM_TEXT:-Arma virumque cano Troiae qui primus ab oris}
+  for code in {000..255}; do
+    print -P -- "$code: $BG[$code]$ZSH_SPECTRUM_TEXT%{$reset_color%}"
+  done
+}