tm script for launching tmux via fzf

tm.sh

#!/bin/sh

TM_ROOT="${TM_ROOT:-$HOME/Projects}"
TM_DEPTH=${TM_DEPTH:-4}
TM_PROJECT_CONTAINS="${TM_PROJECT_CONTAINS:-.git}"
TM_CRITERIA="${TM_CRITERIA:--type d -name $TM_PROJECT_CONTAINS}"
TM_FILTER="${TM_FILTER:-cat}"
TM_EDITOR="${TM_EDITOR:-vi -c 'set number relativenumber'}"

## Functions

err()
{
    echo "ERROR: $(basename $0): $@" 1>&2
    exit 1
}


running_within_tmux()
{
    [ -n "$TMUX" ]
}


## Main program

DIR=$(
    find "$TM_ROOT" -maxdepth $TM_DEPTH $TM_CRITERIA 2>/dev/null | \
        sed "s,^$TM_ROOT/,,; s,/${TM_PROJECT_CONTAINS}$,," | \
        $TM_FILTER | \
        fzf
)

FZF_RC=$?

if [ -z "$DIR" ]; then
    if [ $FZF_RC -eq 1 ]; then
        err "no matching path"
    else
        exit $FZF_RC
    fi
fi

SESSION="$(basename "$DIR" | tr '[:punct:]' '-')"

if ! tmux has-session -t "$SESSION" 2>/dev/null; then
    tmux new-session -d -s "$SESSION" -c "$TM_ROOT/$DIR" -n editor "$TM_EDITOR"
fi

if running_within_tmux; then
    tmux switch-client -t "$SESSION"
else
    tmux attach-session -t "$SESSION"
fi