From e4dbe394f43f47ed8794ecb3853b40458bf26dbd Mon Sep 17 00:00:00 2001
From: Wryn Wagner <wagner.wryn@gmail.com>
Date: Wed, 4 Nov 2020 14:13:41 -0700
Subject: [PATCH] programmatically load os-specific plugin and set preferred
 EDITOR/VISUAL

---
 zsh/rc | 44 +++++++++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 19 deletions(-)

diff --git a/zsh/rc b/zsh/rc
index 100e99e..8c5404d 100644
--- a/zsh/rc
+++ b/zsh/rc
@@ -4,30 +4,36 @@ source "$HOME/.wryn/env/env.zsh"
 
 RC_DIR="$DOTWRYN/zsh"
 
-# zsh plugins
+# --- load custom plugins ------------------------------------------
+
 for file in $(find $RC_DIR -maxdepth 1 -type f ! -name 'rc'); do source $file; done;
 
-# linux-specific plugins
-if [[ "$OSTYPE" == "linux-gnu" ]]; then
-	for file in $(find $RC_DIR/linux -type f); do source $file; done;
-fi
-
-# osx-specific plugins
-if [[ "$OSTYPE" == "darwin"* ]]; then
-	for file in $(find $RC_DIR/osx -type f); do source $file; done;
-fi
+# operating system specific plugins
+case "$OSTYPE" in
+	linux-gnu )
+		for file in $(find $RC_DIR/linux -type f); do source $file; done;
+		;;
+	darwin* )
+		for file in $(find $RC_DIR/osx -type f); do source $file; done;
+		;;
+esac
 
 
-# --- vi / vim as default editor (vim preferred) -------------------
-which vi >/dev/null 2>&1 && {
-	export EDITOR='vi';
-	export VISUAL='vi';
-}
-
-which vim >/dev/null 2>&1 && {
-	export EDITOR='vim';
-	export VISUAL='vim';
+# --- set default editor -------------------------------------------
+SET_PREFERRED_EDITOR() {
+	local PREFERENCE="$PREFERRED_EDITOR"; # load preference from environment (vi vim) by default
+	[ -z $PREFERENCE ] && { echo 'unable to find $PREFERRED_EDITOR environment variable'; return 1; }
+
+	[[ $EDITOR == "${PREFERENCE[-1]}" ]] && [[ $VISUAL == "${PREFERENCE[-1]}" ]] && return 0;
+
+	local AVAILABLE_EDITOR="$EDITOR";
+
+	for program in $PREFERENCE; do which $program >/dev/null 2>&1 && AVAILABLE_EDITOR="$program"; done
+
+	export EDITOR="$AVAILABLE_EDITOR";
+	export VISUAL="$AVAILABLE_EDITOR";
 }
+SET_PREFERRED_EDITOR
 
 
 # --- welcome message ----------------------------------------------