zshrc: Clean up a little

zshrc

@@ -59,8 +59,20 @@ compinit -C
 # Ignore case on completion
 zstyle ':completion:*' matcher-list 'm:{A-Z}={a-z} m:{a-z}={A-Z}'
 
+__has_command() {
+	for i in $@; do
+		which $i &>/dev/null && return 0
+	done
+	return 1
+}
 __find_command() {
-	which "$1" &>/dev/null && echo "$1" || echo "$2"
+	for i in $@; do
+		if __has_command $i; then
+			echo $i
+			return 0
+		fi
+	done
+	return 1
 }
 
 if [ -n "$grep" -o -n "$grep_color" ]; then
@@ -198,8 +210,8 @@ do
 	alias -s "$ext=extr"
 done
 
-[ "$EDITOR" = vim ] && alias vi=vim
-which gpg2 &>/dev/null && alias gpg=gpg2
+__has_command vim && alias vi=vim
+__has_command gpg2 && alias gpg=gpg2
 
 make() {
 	case "$PWD" in
@@ -213,22 +225,23 @@ make() {
 	esac
 }
 
-alias tmux="tmux -f $XDG_CONFIG_HOME/tmux/tmux.conf"
+__has_command tmux && alias tmux="tmux -f $XDG_CONFIG_HOME/tmux/tmux.conf"
 
-if which fossil &>/dev/null; then
+if ! __has_command colordiff; then
+	colordiff() {
+		red="$(tput setaf 1)"
+		green="$(tput setaf 2)"
+		reset="$(tput sgr0)"
+		sed "s/^+.*$/$green&$reset/" | sed "s/^-.*$/$red&$reset/"
+	}
+fi
+
+if __has_command fossil; then
 	alias fl="fossil"
 	alias flc="fossil changes --differ"
 
 	fld() {
-		if which colordiff &>/dev/null; then
 		fossil diff -N "$@" | colordiff | less -FRX
-		else
-			red="$(tput setaf 1)"
-			green="$(tput setaf 2)"
-			reset="$(tput sgr0)"
-			fossil diff -N "$@" | sed "s/^+.*$/$green&$reset/" |
-				sed "s/^-.*$/$red&$reset/" | less -FRX
-		fi
 	}
 
 	flgrep() {
@@ -299,38 +312,35 @@ if which fossil &>/dev/null; then
 	}
 fi
 
-if which cvs &>/dev/null; then
+if __has_command cvs; then
 	cvsd() {
-		if which colordiff &>/dev/null; then
 		cvs diff -uN "$@" | colordiff | less -FRX
-		else
-			red="$(tput setaf 1)"
-			green="$(tput setaf 2)"
-			reset="$(tput sgr0)"
-			cvs diff -uN "$@" | sed "s/^+.*$/$green&$reset/" |
-				sed "s/^-.*$/$red&$reset/" | less -FRX
-		fi
 	}
 fi
 
 # pkgsrc does not like MAKEFLAGS including -j
-which pkg_chk &>/dev/null && alias pkg_chk="MAKEFLAGS= pkg_chk"
-which pkg_rolling-replace &>/dev/null &&
+__has_command pkg_chk &&
+	alias pkg_chk="MAKEFLAGS= pkg_chk"
+__has_command pkg_rolling-replace &&
 	alias pkg_rolling-replace="MAKEFLAGS= pkg_rolling-replace"
-which url2pkg &>/dev/null && alias url2pkg="MAKEFLAGS= url2pkg"
+__has_command url2pkg &&
+	alias url2pkg="MAKEFLAGS= url2pkg"
 
 # mpv does not like locales that use , as decimal point.
-alias mpv="LC_ALL=C mpv"
+__has_command mpv && alias mpv="LC_ALL=C mpv"
 
-alias gpg-ssh="SSH_AUTH_SOCK=$GNUPGHOME/S.gpg-agent.ssh ssh"
-alias gpg-ssh-add="SSH_AUTH_SOCK=$GNUPGHOME/S.gpg-agent.ssh ssh-add"
-alias gpg-sftp="SSH_AUTH_SOCK=$GNUPGHOME/S.gpg-agent.ssh sftp"
+if __has_command gpg gpg2; then
+	alias gpg-ssh="SSH_AUTH_SOCK=$GNUPGHOME/S.gpg-agent.ssh ssh"
+	alias gpg-ssh-add="SSH_AUTH_SOCK=$GNUPGHOME/S.gpg-agent.ssh ssh-add"
+	alias gpg-sftp="SSH_AUTH_SOCK=$GNUPGHOME/S.gpg-agent.ssh sftp"
+fi
 
-pwnk() {
+if __has_command cryptopassphrase; then
+	pwnk() {
 		local clipboard
-	if which pbcopy &>/dev/null; then
+		if __has_command pbcopy; then
 			clipboard=pbcopy
-	elif which xclip &>/dev/null; then
+		elif __has_command xclip; then
 			clipboard=xclip
 		else
 			echo "No clipboard handler found!"
@@ -338,9 +348,10 @@ pwnk() {
 		fi
 
 		cryptopassphrase $@ | tr -d '\n' | $clipboard
-}
-alias pw="pwnk -k ~/.cryptopassphrase.key"
-alias pws="pwnk -k ~/.cryptopassphrase-server.key"
+	}
+	alias pw="pwnk -k ~/.cryptopassphrase.key"
+	alias pws="pwnk -k ~/.cryptopassphrase-server.key"
+fi
 
 ixio() { curl -F 'f:1=<-' ix.io }
 0x0st() { curl -F'file=@-' https://0x0.st }
@@ -397,7 +408,7 @@ cross() {
 			fi
 			;;
 		ios | iossim)
-			if ! which xcrun &>/dev/null; then
+			if ! __has_command xcrun; then
 				echo -n "Can only cross-compile for iOS " 1>&2
 				echo "on a Mac with Xcode!" 1>&2
 				return 1