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plumber-vt: simplify a bit

--- a/plumber-vt.md

+++ b/plumber-vt.md

@@ -22,7 +22,7 @@

 	osc7_cwd() {

 	    local strlen=${#PWD}

 	    local encoded=""

-	    local pos c o

+	    local pos c o p

 	    for (( pos=0; pos<strlen; pos++ )); do

 	        c=${PWD:$pos:1}

 	        case "$c" in

@@ -31,9 +31,11 @@

 	        esac

 	        encoded+="${o}"

 	    done

-	    printf '\e]7;file://%s%s\e\\' "${HOSTNAME%.lan}" "${encoded}"

+	    p=`printf '\e]7;file://%s%s\e\\' "${HOSTNAME%.lan}" "${encoded}"`

 	    if [ -n "$TMUX" ]; then

-	        printf '\e]7;file://%s%s\e\\' "${HOSTNAME%.lan}" "${encoded}" > `tmux display-message -p '#{client_tty}'`

+	    	printf "%s" "$p" >`tmux display-message -p '#{client_tty}'`

+	    else

+	        printf "%s" "$p"

 	    fi

 	}

 	export PROMPT_COMMAND=${PROMPT_COMMAND:+$PROMPT_COMMAND; }osc7_cwd