working monitor-session-activity.sh, tmux plugin script untested

.gitignore

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+*.log

README.md

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+# tmux-watcher-tmux
+
+A [activity watcher](https://activitywatch.net) for tmux.
+
+Watches for activity in multiple tmux sesstions and reports `session_name`, `window_name`, `pane_title`, `pane_current_command`, and `pane_current_path`.
+
+## How to install
+
+Intall the [Tmux Plugin Manager](https://github.com/tmux-plugins/tpm) and install `akohlbecker/aw-watcher-tmux` as tmux plugin. More detailed instructions are found in the tmp README.
+

aw-watcher-tmux.tmux

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+#!/usr/bin/env bash
+
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+$CURRENT_DIR/scripts/monitor-session-activity.sh &

scripts/monitor-session-activity.sh

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+#!/bin/bash
+
+POLL_INTERVAL=10 # seconds
+
+BUCKET_ID="aw-watcher-tmux"
+HOST="localhost"
+PORT="5600"
+API_URL="http://$HOST:$PORT/api"
+PULSETIME="120.0"
+
+######
+# Related documentation:
+#  * https://github.com/tmux/tmux/wiki/Formats
+#  * https://github.com/tmux/tmux/wiki/Advanced-Use#user-content-getting-information
+#
+#
+
+
+### FUNCTIONS
+
+DEBUG=0
+TMP_FILE=$(mktemp)
+echo $TMP_FILE
+
+init_bucket() {
+    HTTP_CODE=$(curl -X GET "${API_URL}/0/buckets/$BUCKET_ID" -H "accept: application/json" -s -o /dev/null -w %{http_code})
+    if (( $HTTP_CODE == 404 )) # not found
+    then
+        JSON="{\"client\":\"$BUCKET_ID\",\"type\":\"tmux.sessions\",\"hostname\":\"$(hostname)\"}"
+        HTTP_CODE=$(curl -X POST "${API_URL}/0/buckets/$BUCKET_ID" -H "accept: application/json" -H "Content-Type: application/json" -d "$JSON"  -s -o /dev/null -w %{http_code})
+        if (( $HTTP_CODE != 200 ))
+        then
+            echo "ERROR creating bucket"
+            exit -1
+        fi
+    fi
+}
+
+log_to_bucket() {
+    sess=$1
+    DATA=$(tmux display -t $sess -p "{\"title\":\"#{session_name}\",\"session_name\":\"#{session_name}\",\"window_name\":\"#{window_name}\",\"pane_title\":\"#{pane_title}\",\"pane_current_command\":\"#{pane_current_command}\",\"pane_current_path\":\"#{pane_current_path}\"}");
+    PAYLOAD="{\"timestamp\":\"$(date -Is)\",\"duration\":0,\"data\":$DATA}"
+    echo "$PAYLOAD"
+    HTTP_CODE=$(curl -X POST "${API_URL}/0/buckets/$BUCKET_ID/heartbeat?pulsetime=$PULSETIME" -H "accept: application/json" -H "Content-Type: application/json" -d "$PAYLOAD" -s -o $TMP_FILE -w %{http_code})
+    if (( $HTTP_CODE != 200 )); then
+        echo "Request failed"
+        cat $TMP_FILE
+    fi
+
+    if [[ "$DEBUG" -eq "1" ]]; then
+        cat $TMP_FILE
+    fi
+}
+
+
+### MAIN POLL LOOP
+
+declare -A act_last
+declare -A act_current
+
+init_bucket
+
+while [ true ]
+do
+    #clear
+	sessions=$(tmux list-sessions | awk '{print $1}')
+	if (( $? != 0 )); then
+        echo "tmux list-sessions ERROR: $?"
+    fi
+	if (( $? == 0 )); then
+        LAST_IFS=$IFS
+        IFS='
+'   
+        for sess in ${sessions}; do
+            act_time=$(tmux display -t $sess -p '#{session_activity}')
+            if [[ ! -v "act_last[$sess]" ]];  then
+                act_last[$sess]='0'
+            fi
+            if (( $act_time > ${act_last[$sess]} )); then
+                # echo "###> "$sess' '$(date -Iseconds)'    '$act_time' '$act_last[$sess] ##  >> tmux-sess-act.log
+                log_to_bucket $sess
+            fi
+            act_current[$sess]=$act_time 
+        done
+        IFS=$LAST_IFS
+        # copy arrays
+        unset R
+        declare -A act_last
+        for sess in "${!act_current[@]}"; do
+            act_last[$sess]=${act_current[$sess]}
+        done
+	fi
+	
+	sleep $POLL_INTERVAL
+done