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[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

simplified pane switching
[etc/tmux.git] / .bin / tmux
1 #!/bin/sh
2 set -eu
3
4 LASTSESSIONIDFILE="${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/tmux-last-session-id"
5
6 real_tmux() {
7   local exec; exec=exec
8   if [ -n "${_tmux_eval_only:-}" ]; then
9     exec=
10   fi
11   $exec $(which -a tmux | grep -v $HOME | head -1) "$@"
12 }
13
14 single_tmux_session() {
15   local id; id="$1"; shift
16   local flag; flag=t
17   real_tmux list-sessions | grep -q "^${id}:" || flag=s
18   real_tmux new -$flag "$id" "$@"
19 }
20
21 tmux_session_exists() {
22   _tmux_eval_only=1 real_tmux has-session -t "$1"
23 }
24
25 if [ "${1:-}" = last ]; then
26   shift
27   if [ -f "$LASTSESSIONIDFILE" ]; then
28     UUID="$(cat $LASTSESSIONIDFILE)"
29     if tmux_session_exists $UUID; then
30       echo >&2 Attaching to existing session with ID $UUID…
31       single_tmux_session "$(cat $LASTSESSIONIDFILE)" "$@"
32     else
33       echo >&2 W: No tmux session with ID $UUID found, generating a new one…
34     fi
35   else
36     echo >&2 W: No tmux session ID stored, generating a new one…
37   fi
38
39 else
40   case "${1:-;}" in
41     (\;) :;;
42     (*) real_tmux "$@";;
43   esac
44 fi
45
46 # only without argument create a new session with a random name/id to which we
47 # can then attach
48
49 hascmd() { command -v "$@" >/dev/null;}
50
51 if   hascmd uuid; then alias uuidgen=uuid
52 elif hascmd uuidgen; then :
53 elif hascmd python3; then
54   uuidgen() { python3 -c 'import uuid; print(uuid.uuid1())'; }
55 elif hascmd python; then
56   uuidgen() { python -c 'import uuid; print(uuid.uuid1())'; }
57 else
58   uuidgen() { dd if=/dev/urandom bs=16 count=1 status=none | base64; }
59 fi
60 UUID=$(uuidgen)
61 echo "$UUID" > $LASTSESSIONIDFILE
62
63 echo >&2 Starting a new session with ID $UUID…
64
65 single_tmux_session $UUID "$@"