fix: add some compatibility options

this commit introduces the `has` function.
Now I can ensure that any command I want to alias or call is available
first.

This should allow the config to automatically slot in even where systems
aren't configured in the way I would expect

aliases

@@ -34,21 +34,23 @@
 
 ## Use Exa instead of ls
 ## REQUIRES NERD FONT
-alias ls='exa --icons --group-directories-first'
+has exa && alias ls='exa --icons --group-directories-first'
 
 ## Shorten xdg-open
-alias xopen='xdg-open'
+has xdg-open && alias xopen='xdg-open'
 
 ## cls Clear Screen run ls
 alias cls='clear; ls'
 
 ## Shorten scriptedit
 ## REQUIRES scriptedit (Script)
-alias se='scriptedit'
+has scriptedit && alias se='scriptedit'
 
 ## YouTube downloader
+if has youtube-dl ; then
 	alias yt='youtube-dl'
 	alias yta='youtube-dl --ignore-config --add-metadata --ignore-errors --extract-audio --format "bestaudio/best"'
+fi
 
 ##
 alias cp='cp --interactive --verbose'
@@ -62,10 +64,10 @@ alias grep='grep --color=auto'
 alias ip='ip --color=auto'
 
 ## Open Vimwiki
-alias vw='nvim -c VimwikiIndex'
+has nvim && alias vw='nvim -c VimwikiIndex'
 
 ## Change Wineprefix quick and EZ
-alias ws='source wineselect'
+has wineselect && alias ws='source wineselect'
 
 ## zero a terminal session
 alias zero='dirs -c && clear'
@@ -74,11 +76,24 @@ alias zero='dirs -c && clear'
 # FileType Associations #
 #   extension=program   #
 #########################
+if has nvim; then
+	VIM=nvim
+elif has vim; then
+	VIM=vim
+elif has vi; then
+	VIM=vi
+else
+	VIM=''
+fi
 
-alias -s tex=nvim
-alias -s html=nvim
-alias -s pdf=zathura
-alias -s md=nvim
+if [[ -n $VIM ]]; then
+	alias -s tex=$VIM
+	alias -s html=$VIM
+	alias -s md=$VIM
+fi
+unset $VIM
+
+has zathura && alias -s pdf=zathura
 
 
 #  vim: set ft=zsh ts=2 sw=2 tw=0 noet :

chpwd

@@ -1,6 +1,4 @@
-HAS_GLOW="$(command -v glow)"
-
 chpwd() {
-	[ -z $HAS_GLOW ] && return 0
+	[ ! has glow ] && return 0
 	find $PWD -maxdepth 1  -iname 'readme.md' -exec glow {} \;
 }

functions/has

@@ -0,0 +1,8 @@
+## Has function
+
+has() {
+	Command=$1
+	[[ -z $Command ]] && return 1
+
+	command -v $Command > /dev/null 2>&1
+}

greet

@@ -1,6 +1,4 @@
-#!/bin/sh
-
-colours.sh
+has colours.sh && colours.sh
 echo '╭───────────╮'
 echo '│ Welcome!! │'
 echo '╰───────────╯'
@@ -15,5 +13,5 @@ if [ -d "$HOME/tmp" ]; then
         fi
     fi
 fi
-randomVerse
-colours.sh
+has randomVerse && randomVerse
+has colours.sh && colours.sh

zshrc

@@ -22,6 +22,7 @@ fpath=( $ZDOTDIR/functions $fpath )
 autoload CleanTmp
 autoload setTermTitle
 autoload tempPersist
+autoload has
 
 ## Source Other files
 source ${ZDOTDIR}/aliases
@@ -46,10 +47,12 @@ zle -N edit-command-line
 bindkey "^X^E" edit-command-line
 
 ## Enable gpg-agent support
+if [[ "$USE_GPG_AGENT" == "true" ]]; then
 	export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)
 	gpgconf --launch gpg-agent
 	gpg-connect-agent /bye
 	export GPG_TTY=$(tty)
+fi
 
 ## Load external stuff
 
@@ -83,4 +86,4 @@ source $ZDOTDIR/ZshPlug/ZshPlug.zsh
 [[ -n "${key[PageUp]}" ]]    && bindkey "${key[PageUp]}"     history-beginning-search-backward
 [[ -n "${key[PageDown]}" ]]  && bindkey "${key[PageDown]}"   history-beginning-search-forward
 
-$ZDOTDIR/greet
+source $ZDOTDIR/greet