From 6cf2a9da6789cfd9cb204371062e6c325efa38e6 Mon Sep 17 00:00:00 2001
From: Andrew Cady <d@jerkface.net>
Date: Sun, 9 Oct 2022 16:15:02 -0400
Subject: automatically log all tmux sessions if $HOME/.tmux-log-everything/
 exists

---
 dot/bashrc                        |  2 ++
 dot/local/bin/tmux-log-everything | 40 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)
 create mode 100755 dot/local/bin/tmux-log-everything

diff --git a/dot/bashrc b/dot/bashrc
index 36d6b6b..121ad51 100644
--- a/dot/bashrc
+++ b/dot/bashrc
@@ -60,6 +60,8 @@ memoize_retval()
   add_path -a /usr/games
   add_path "$HOME/.cabal/bin" "$HOME/.local/bin" "$HOME/bin"
 
+  tmux-log-everything
+
 # if have stack; then
 #   add_stack_binpath
 # fi
diff --git a/dot/local/bin/tmux-log-everything b/dot/local/bin/tmux-log-everything
new file mode 100755
index 0000000..1e7588b
--- /dev/null
+++ b/dot/local/bin/tmux-log-everything
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+# Inspired by https://github.com/tmux-plugins/tmux-logging via
+# https://unix.stackexchange.com/questions/623054/how-to-automatically-log-all-my-tmux-sessions-to-a-file-in-directory-accordin
+# but massively simplified.
+
+# The tmux-logging plugin usees a different global variable for each pane (named
+# after the pane number) to check whether it is already logging. When the pane
+# is destroyed, the variable stays set. When a new pane is opened, it can
+# recycle the same pane number as before. The plugin will not log to any pane
+# with a recycled pane number!
+#
+# Luckily, tmux supports pane-local variables, which are automatically destroyed
+# when the pane is destroyed! So here we just use one of those.
+
+tmux_log_everything()
+{
+    if ! [ "$TMUX_PANE" ]
+    then
+        return # We are not in tmux
+    fi
+
+    local LOGDIR LOGFILE
+    LOGDIR=$HOME/.tmux-log-everything
+    if ! [ -d "$LOGDIR" ]
+    then
+        return # User has not "requested" logging by creating log dir
+    fi
+
+    if [ "$(tmux show-option -pqv @pane-is-logging)" ]
+    then
+        return
+    fi
+
+    LOGFILE=$LOGDIR/$(date -Is).$$.log.gz
+    tmux set-option -pq @pane-is-logging y
+    tmux pipe-pane "gzip -c > $LOGFILE"
+}
+
+tmux_log_everything
-- 
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