zsh: clean up zshrc

stow/.zshrc

@@ -1,12 +1,14 @@
 # z shell configuration
 
-OSICON="?"
+#
+# prompt
+#
 
-# set prompt icon
+# set icon
 if [ -e /System ]; then 
   OSICON=""
   eval "$(/opt/homebrew/bin/brew shellenv)"
-else
+elif [ -f /etc/os-release ]; then
   . /etc/os-release &> /dev/null
 
   if [ "$ID" = "nixos" ]; then
@@ -18,21 +20,20 @@ else
   elif [ "$ID" = "arch" ]; then
     OSICON=""
   fi
+else
+  OSICON="$"
 fi
 
 # set prompt colours
-HOSTNAME="$(hostname)"
-
 if [ -f ~/.cache/zsh_colours.sh ]; then
   source ~/.cache/zsh_colours.sh
 else
   PRIMARY_COLOUR="{blue}"
-  SECONDARY_COLOUR="{red}"
+  SECONDARY_COLOUR="{yellow}"
   TEXT_COLOUR="{black}"
 fi
 
 PROMPT="%F$PRIMARY_COLOUR%~ %F$SECONDARY_COLOUR$OSICON %k%F$TEXT_COLOUR"
-RPROMPT=""
 
 bindkey -e
 
@@ -41,13 +42,13 @@ zstyle ':completion:*' matcher-list 'm:{a-z}={A-Za-z}'
 zstyle ':completion:*' list-colors "${(s.:.)LS_COLORS}"
 zstyle ':completion:*' menu no
 
-# hist
+#
+# history
+#
 HISTFILE="$HOME/.local/share/zsh_hist"
 HISTSIZE=10000000
 SAVEHIST=$HISTSIZE
 
-HOMEBREW_NO_AUTO_UPDATE=1
-
 setopt appendhistory
 setopt sharehistory
 setopt hist_save_no_dups
@@ -55,13 +56,19 @@ setopt hist_ignore_all_dups
 setopt hist_find_no_dups
 setopt hist_ignore_space
 
+#
 # shell alias
+# 
 alias ls="ls -h --color=auto"
 alias la="ls -ah --color=auto"
 alias ll="ls -ahl --color=auto"
 alias cat="bat"
 alias rm="trash"
 
+alias v="nvim"
+alias vi="nvim"
+alias vim="nvim"
+
 alias ssh="TERM=xterm-256color ssh" # fix ssh not recognising terminal and remote shell being somewhat broken
 alias tmux="tmux -f $HOME/.config/tmux/tmux.conf" # needed for osx systems for some reason
 
@@ -72,12 +79,17 @@ export PATH="$PATH:$GOPATH/bin"
 export EDITOR="nvim"
 
 # plugins
+#
 plugindir="$HOME/.local/share/zsh_plug"
 func plugInstall() {
   # clones a repo and then sources it.
   # first arg is git url, second is source
   # location
   
+  if [ ! command -v "git" &> /dev/null ]; then
+    exit 1
+  fi
+
   foldername=$(basename $1)
   clonepath="$plugindir/$foldername"
   sourcefile="$clonepath/$2"