Add infrastructure for debugging.

Author: Sergei Gerasenko

Diff for: scripts/continuum_save.sh

@@ -1,11 +1,25 @@
 #!/usr/bin/env bash
-
+set +x
 CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 source "$CURRENT_DIR/helpers.sh"
 source "$CURRENT_DIR/variables.sh"
 source "$CURRENT_DIR/shared.sh"
 
+DEBUG=$(get_tmux_option "$debug")
+
+get_log_path() {
+  get_tmux_option "$log_path" "$log_path_default"
+}
+
+log_message() {
+  log_path=$(get_log_path)
+  if [ "$DEBUG" == "1" ] && [ -n "$log_path" ]; then
+    message="$@"
+    echo "$message" >> $log_path
+  fi
+}
+
 supported_tmux_version_ok() {
 	"$CURRENT_DIR/check_tmux_version.sh" "$SUPPORTED_VERSION"
 }
@@ -18,6 +32,14 @@ auto_save_not_disabled() {
 	[ "$(get_interval)" -gt 0 ]
 }
 
+get_next_run() {
+	local last_saved_timestamp="$(get_tmux_option "$last_auto_save_option" "0")"
+	local interval_minutes="$(get_interval)"
+	local interval_seconds="$((interval_minutes * 60))"
+	local next_run="$((last_saved_timestamp + $interval_seconds))"
+  echo $next_run
+}
+
 enough_time_since_last_run_passed() {
 	local last_saved_timestamp="$(get_tmux_option "$last_auto_save_option" "0")"
 	local interval_minutes="$(get_interval)"
@@ -29,13 +51,29 @@ enough_time_since_last_run_passed() {
 fetch_and_run_tmux_resurrect_save_script() {
 	local resurrect_save_script_path="$(get_tmux_option "$resurrect_save_path_option" "")"
 	if [ -n "$resurrect_save_script_path" ]; then
-		"$resurrect_save_script_path" "quiet" >/dev/null 2>&1 &
+    if [ -n "$DEBUG" ]; then
+      local log_path=$(get_log_path)
+      log_message "Calling $resurrect_save_script_path"
+		  "$resurrect_save_script_path" >> $log_path 2>&1 &
+    else
+		  "$resurrect_save_script_path" "quiet" >/dev/null 2>&1 &
+    fi
 		set_last_save_timestamp
 	fi
 }
 
 main() {
+  if [ -n "$DEBUG" ]; then
+    TS_NEXT=$(get_next_run)
+    TIME_NEXT=$(date -d \@"$TS_NEXT" +"%Y-%m-%d at %H:%M:%S")
+    MSG="Next save on $TIME_NEXT"
+    log_message "$(date +'%Y-%m-%d %H:%M:%S'): $MSG"
+  fi
 	if supported_tmux_version_ok && auto_save_not_disabled && enough_time_since_last_run_passed; then
+    if [ -n "$DEBUG" ]; then
+      log_message "Actual run on $(date)"
+      echo "Saved on $(date +'%Y-%m-%d@%H:%M:%S')"
+    fi
 		fetch_and_run_tmux_resurrect_save_script
 	fi
 }

Diff for: scripts/variables.sh

@@ -1,5 +1,9 @@
 SUPPORTED_VERSION="1.9"
 
+log_path="@continuum-log-path"
+log_path_default="${HOME}/tmux-continuum.log"
+debug="@continuum-debug"
+
 # these tmux options contain paths to tmux resurrect save and restore scripts
 resurrect_save_path_option="@resurrect-save-script-path"
 resurrect_restore_path_option="@resurrect-restore-script-path"