diff --git a/.dfminstall b/.dfminstall
index e798f80..4057227 100644
--- a/.dfminstall
+++ b/.dfminstall
@@ -3,6 +3,15 @@ bin recurse
 
 bin/dfm chmod 0755
 .tmux/newpanes 0755
+.tmux/prefix_highlight.tmux 0755
+.tmux/scripts/check_tmux_version.sh 0755
+.tmux/scripts/custom_tree.sh 0755
+.tmux/scripts/helpers.sh 0755
+.tmux/scripts/save_sidebar_width.sh 0755
+.tmux/scripts/toggle.sh 0755
+.tmux/scripts/tree_helpers.sh 0755
+.tmux/scripts/variables.sh 0755
+.tmux/sidebar.tmux 0755
 .tmux/zoom 0755
 
 .dotfiles/.iterm2 skip
diff --git a/.gitignore b/.gitignore
index 2b93ed7..a15276b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
-tmux.start.sh
+*.sublime-workspace
 .config/mc/hotlist
 .vim/.netrwhist
-*.sublime-workspace
+.tmux/sidebar/directory_widths.txt
+tmux.start.sh
diff --git a/.tmux.conf b/.tmux.conf
index ad7e99b..42322de 100644
--- a/.tmux.conf
+++ b/.tmux.conf
@@ -147,4 +147,9 @@ run-shell ~/.tmux/prefix_highlight.tmux
 set -g @prefix_highlight_fg 'white' # default is 'colour231'
 set -g @prefix_highlight_bg 'blue'  # default is 'colour04'
 set -g @prefix_highlight_show_copy_mode 'on'
-set -g @prefix_highlight_copy_mode_attr 'fg=black,bg=yellow,bold' # default is 'fg=default,bg=yellow'
\ No newline at end of file
+set -g @prefix_highlight_copy_mode_attr 'fg=black,bg=yellow,bold' # default is 'fg=default,bg=yellow'
+
+# tmux-sidebar (https://github.com/tmux-plugins/tmux-sidebar)
+run-shell ~/.tmux/sidebar.tmux
+set -g @sidebar-tree-position 'left'
+set -g @sidebar-tree-width '40'
\ No newline at end of file
diff --git a/.tmux/scripts/check_tmux_version.sh b/.tmux/scripts/check_tmux_version.sh
new file mode 100755
index 0000000..21a543e
--- /dev/null
+++ b/.tmux/scripts/check_tmux_version.sh
@@ -0,0 +1,78 @@
+#!/usr/bin/env bash
+
+VERSION="$1"
+UNSUPPORTED_MSG="$2"
+
+get_tmux_option() {
+	local option=$1
+	local default_value=$2
+	local option_value=$(tmux show-option -gqv "$option")
+	if [ -z "$option_value" ]; then
+		echo "$default_value"
+	else
+		echo "$option_value"
+	fi
+}
+
+# Ensures a message is displayed for 5 seconds in tmux prompt.
+# Does not override the 'display-time' tmux option.
+display_message() {
+	local message="$1"
+
+	# display_duration defaults to 5 seconds, if not passed as an argument
+	if [ "$#" -eq 2 ]; then
+		local display_duration="$2"
+	else
+		local display_duration="5000"
+	fi
+
+	# saves user-set 'display-time' option
+	local saved_display_time=$(get_tmux_option "display-time" "750")
+
+	# sets message display time to 5 seconds
+	tmux set-option -gq display-time "$display_duration"
+
+	# displays message
+	tmux display-message "$message"
+
+	# restores original 'display-time' value
+	tmux set-option -gq display-time "$saved_display_time"
+}
+
+# this is used to get "clean" integer version number. Examples:
+# `tmux 1.9` => `19`
+# `1.9a`     => `19`
+get_digits_from_string() {
+	local string="$1"
+	local only_digits="$(echo "$string" | tr -dC '[:digit:]')"
+	echo "$only_digits"
+}
+
+tmux_version_int() {
+	local tmux_version_string=$(tmux -V)
+	echo "$(get_digits_from_string "$tmux_version_string")"
+}
+
+unsupported_version_message() {
+	if [ -n "$UNSUPPORTED_MSG" ]; then
+		echo "$UNSUPPORTED_MSG"
+	else
+		echo "Error, Tmux version unsupported! Please install Tmux version $VERSION or greater!"
+	fi
+}
+
+exit_if_unsupported_version() {
+	local current_version="$1"
+	local supported_version="$2"
+	if [ "$current_version" -lt "$supported_version" ]; then
+		display_message "$(unsupported_version_message)"
+		exit 1
+	fi
+}
+
+main() {
+	local supported_version_int="$(get_digits_from_string "$VERSION")"
+	local current_version_int="$(tmux_version_int)"
+	exit_if_unsupported_version "$current_version_int" "$supported_version_int"
+}
+main
\ No newline at end of file
diff --git a/.tmux/scripts/custom_tree.sh b/.tmux/scripts/custom_tree.sh
new file mode 100755
index 0000000..e19de2c
--- /dev/null
+++ b/.tmux/scripts/custom_tree.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+find . -path '*/.git*' -prune -o -print |
+	sed -e 's;[^/]*/;|___;g;s;___|; |;g'
\ No newline at end of file
diff --git a/.tmux/scripts/helpers.sh b/.tmux/scripts/helpers.sh
new file mode 100755
index 0000000..c7d85cc
--- /dev/null
+++ b/.tmux/scripts/helpers.sh
@@ -0,0 +1,101 @@
+get_tmux_option() {
+	local option=$1
+	local default_value=$2
+	local option_value=$(tmux show-option -gqv "$option")
+	if [ -z "$option_value" ]; then
+		echo "$default_value"
+	else
+		echo "$option_value"
+	fi
+}
+
+set_tmux_option() {
+	local option=$1
+	local value=$2
+	tmux set-option -gq "$option" "$value"
+}
+
+# Ensures a message is displayed for 5 seconds in tmux prompt.
+# Does not override the 'display-time' tmux option.
+display_message() {
+	local message="$1"
+
+	# display_duration defaults to 5 seconds, if not passed as an argument
+	if [ "$#" -eq 2 ]; then
+		local display_duration="$2"
+	else
+		local display_duration="5000"
+	fi
+
+	# saves user-set 'display-time' option
+	local saved_display_time=$(get_tmux_option "display-time" "750")
+
+	# sets message display time to 5 seconds
+	tmux set-option -gq display-time "$display_duration"
+
+	# displays message
+	tmux display-message "$message"
+
+	# restores original 'display-time' value
+	tmux set-option -gq display-time "$saved_display_time"
+}
+
+stored_key_vars() {
+	tmux show-options -g |
+		\grep -i "^${VAR_KEY_PREFIX}-" |
+		cut -d ' ' -f1 |               # cut just the variable names
+		xargs                          # splat var names in one line
+}
+
+# get the key from the variable name
+get_key_from_option_name() {
+	local option="$1"
+	echo "$option" |
+		sed "s/^${VAR_KEY_PREFIX}-//"
+}
+
+get_value_from_option_name() {
+	local option="$1"
+	echo "$(get_tmux_option "$option" "")"
+}
+
+get_pane_info() {
+	local pane_id="$1"
+	local format_strings="#{pane_id},$2"
+	tmux list-panes -t "$pane_id" -F "$format_strings" |
+		\grep "$pane_id" |
+		cut -d',' -f2-
+}
+
+sidebar_dir() {
+	echo "$SIDEBAR_DIR"
+}
+
+sidebar_file() {
+	echo "$(sidebar_dir)/directory_widths.txt"
+}
+
+directory_in_sidebar_file() {
+	local pane_current_path="$1"
+	grep -q "^${pane_current_path}\t" $(sidebar_file) 2>/dev/null
+}
+
+width_from_sidebar_file() {
+	local pane_current_path="$1"
+	grep "^${pane_current_path}\t" $(sidebar_file) |
+	cut -f2
+}
+
+# function is used to get "clean" integer version number. Examples:
+# `tmux 1.9` => `19`
+# `1.9a`     => `19`
+_get_digits_from_string() {
+	local string="$1"
+	local only_digits="$(echo "$string" | tr -dC '[:digit:]')"
+	echo "$only_digits"
+}
+
+tmux_version_int() {
+	local tmux_version_string=$(tmux -V)
+	echo "$(_get_digits_from_string "$tmux_version_string")"
+}
\ No newline at end of file
diff --git a/.tmux/scripts/save_sidebar_width.sh b/.tmux/scripts/save_sidebar_width.sh
new file mode 100755
index 0000000..8b396c0
--- /dev/null
+++ b/.tmux/scripts/save_sidebar_width.sh
@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+source "$CURRENT_DIR/helpers.sh"
+source "$CURRENT_DIR/variables.sh"
+
+DIR_PATH="$(echo "$1" | tail -1)" # fixes a bug with invalid param
+WIDTH="$2"
+delimiter=$'\t'
+
+replace_directory_width() {
+	sed "s|^${DIR_PATH}${delimiter}.*|${DIR_PATH}${delimiter}${WIDTH}|g" $(sidebar_file) > $(sidebar_file).bak
+	mv $(sidebar_file).bak $(sidebar_file)
+}
+
+add_directory_width() {
+	mkdir -p "$(sidebar_dir)"
+	echo "${DIR_PATH}${delimiter}${WIDTH}" >> $(sidebar_file)
+}
+
+save_sidebar_width() {
+	if directory_in_sidebar_file "$DIR_PATH"; then
+		replace_directory_width
+	else
+		add_directory_width
+	fi
+}
+
+main() {
+	save_sidebar_width
+}
+main
\ No newline at end of file
diff --git a/.tmux/scripts/toggle.sh b/.tmux/scripts/toggle.sh
new file mode 100755
index 0000000..0a05760
--- /dev/null
+++ b/.tmux/scripts/toggle.sh
@@ -0,0 +1,204 @@
+#!/usr/bin/env bash
+
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+source "$CURRENT_DIR/helpers.sh"
+source "$CURRENT_DIR/variables.sh"
+
+# script global vars
+ARGS="$1"               # example args format: "tree | less,right,20,focus"
+PANE_ID="$2"
+COMMAND="$(echo "$ARGS"  | cut -d',' -f1)"   # "tree | less"
+POSITION="$(echo "$ARGS" | cut -d',' -f2)"   # "right"
+SIZE="$(echo "$ARGS"     | cut -d',' -f3)"   # "20"
+FOCUS="$(echo "$ARGS"    | cut -d',' -f4)"   # "focus"
+
+PANE_WIDTH="$(get_pane_info "$PANE_ID" "#{pane_width}")"
+PANE_CURRENT_PATH="$(get_pane_info "$PANE_ID" "#{pane_current_path}")"
+
+supported_tmux_version_ok() {
+	$CURRENT_DIR/check_tmux_version.sh "$SUPPORTED_TMUX_VERSION"
+}
+
+sidebar_registration() {
+	get_tmux_option "${REGISTERED_PANE_PREFIX}-${PANE_ID}" ""
+}
+
+sidebar_pane_id() {
+	sidebar_registration |
+		cut -d',' -f1
+}
+
+sidebar_pane_args() {
+	echo "$(sidebar_registration)" |
+		cut -d',' -f2-
+}
+
+register_sidebar() {
+	local sidebar_id="$1"
+	set_tmux_option "${REGISTERED_SIDEBAR_PREFIX}-${sidebar_id}" "$PANE_ID"
+	set_tmux_option "${REGISTERED_PANE_PREFIX}-${PANE_ID}" "${sidebar_id},${ARGS}"
+}
+
+registration_not_for_the_same_command() {
+	local registered_args="$(sidebar_registration | cut -d',' -f2-)"
+	[[ $ARGS != $registered_args ]]
+}
+
+sidebar_exists() {
+	local pane_id="$(sidebar_pane_id)"
+	tmux list-panes -F "#{pane_id}" 2>/dev/null |
+		\grep -q "^${pane_id}$"
+}
+
+has_sidebar() {
+	if [ -n "$(sidebar_registration)" ] && sidebar_exists; then
+		return 0
+	else
+		return 1
+	fi
+}
+
+current_pane_width_not_changed() {
+	if [ $PANE_WIDTH -eq $1 ]; then
+		return 0
+	else
+		return 1
+	fi
+}
+
+kill_sidebar() {
+	# get data before killing the sidebar
+	local sidebar_pane_id="$(sidebar_pane_id)"
+	local sidebar_args="$(sidebar_pane_args)"
+	local sidebar_position="$(echo "$sidebar_args" | cut -d',' -f2)" # left or defults to right
+	local sidebar_width="$(get_pane_info "$sidebar_pane_id" "#{pane_width}")"
+
+	$CURRENT_DIR/save_sidebar_width.sh "$PANE_CURRENT_PATH" "$sidebar_width"
+
+	# kill the sidebar
+	tmux kill-pane -t "$sidebar_pane_id"
+
+	# check current pane "expanded" properly
+	local new_current_pane_width="$(get_pane_info "$PANE_ID" "#{pane_width}")"
+	if current_pane_width_not_changed "$new_current_pane_width"; then
+		# need to expand current pane manually
+		local direction_flag
+		if [[ "$sidebar_position" =~ "left" ]]; then
+			direction_flag="-L"
+		else
+			direction_flag="-R"
+		fi
+		# compensate 1 column
+		tmux resize-pane "$direction_flag" "$((sidebar_width + 1))"
+	fi
+	PANE_WIDTH="$new_current_pane_width"
+}
+
+sidebar_left() {
+	[[ $POSITION =~ "left" ]]
+}
+
+no_focus() {
+	if [[ $FOCUS =~ (^focus) ]]; then
+		return 1
+	else
+		return 0
+	fi
+}
+
+size_defined() {
+	[ -n $SIZE ]
+}
+
+desired_sidebar_size() {
+	local half_pane="$((PANE_WIDTH / 2))"
+	if directory_in_sidebar_file "$PANE_CURRENT_PATH"; then
+		# use stored sidebar width for the directory
+		echo "$(width_from_sidebar_file "$PANE_CURRENT_PATH")"
+	elif size_defined && [ $SIZE -lt $half_pane ]; then
+		echo "$SIZE"
+	else
+		echo "$half_pane"
+	fi
+}
+
+# tmux version 2.0 and below requires different argument for `join-pane`
+use_inverted_size() {
+	[ tmux_version_int -le 20 ]
+}
+
+split_sidebar_left() {
+	local sidebar_size=$(desired_sidebar_size)
+	if use_inverted_size; then
+		sidebar_size=$((PANE_WIDTH - $sidebar_size - 1))
+	fi
+	local sidebar_id="$(tmux new-window -c "$PANE_CURRENT_PATH" -P -F "#{pane_id}" "$COMMAND")"
+	tmux join-pane -hb -l "$sidebar_size" -t "$PANE_ID" -s "$sidebar_id"
+	echo "$sidebar_id"
+}
+
+split_sidebar_right() {
+	local sidebar_size=$(desired_sidebar_size)
+	tmux split-window -h -l "$sidebar_size" -c "$PANE_CURRENT_PATH" -P -F "#{pane_id}" "$COMMAND"
+}
+
+create_sidebar() {
+	local position="$1" # left / right
+	local sidebar_id="$(split_sidebar_${position})"
+	register_sidebar "$sidebar_id"
+	if no_focus; then
+		tmux last-pane
+	fi
+}
+
+current_pane_is_sidebar() {
+	local var="$(get_tmux_option "${REGISTERED_SIDEBAR_PREFIX}-${PANE_ID}" "")"
+	[ -n "$var" ]
+}
+
+current_pane_too_narrow() {
+	[ $PANE_WIDTH -lt $MINIMUM_WIDTH_FOR_SIDEBAR ]
+}
+
+execute_command_from_main_pane() {
+	# get pane_id for this sidebar
+	local main_pane_id="$(get_tmux_option "${REGISTERED_SIDEBAR_PREFIX}-${PANE_ID}" "")"
+	# execute the same command as if from the "main" pane
+	$CURRENT_DIR/toggle.sh "$ARGS" "$main_pane_id"
+}
+
+exit_if_pane_too_narrow() {
+	if current_pane_too_narrow; then
+		display_message "Pane too narrow for the sidebar"
+		exit
+	fi
+}
+
+toggle_sidebar() {
+	if has_sidebar; then
+		kill_sidebar
+		# if using different sidebar command automatically open a new sidebar
+		# if registration_not_for_the_same_command; then
+		# 	create_sidebar
+		# fi
+	else
+		exit_if_pane_too_narrow
+		if sidebar_left; then
+			create_sidebar "left"
+		else
+			create_sidebar "right"
+		fi
+	fi
+}
+
+main() {
+	if supported_tmux_version_ok; then
+		if current_pane_is_sidebar; then
+			execute_command_from_main_pane
+		else
+			toggle_sidebar
+		fi
+	fi
+}
+main
\ No newline at end of file
diff --git a/.tmux/scripts/tree_helpers.sh b/.tmux/scripts/tree_helpers.sh
new file mode 100755
index 0000000..6119107
--- /dev/null
+++ b/.tmux/scripts/tree_helpers.sh
@@ -0,0 +1,42 @@
+# file sourced from ./sidebar.tmux
+custom_tree_command="$CURRENT_DIR/scripts/custom_tree.sh"
+
+command_exists() {
+	local command="$1"
+	type "$command" >/dev/null 2>&1
+}
+
+tree_command() {
+	local user_command="$(tree_user_command)"
+	if [ -n "$user_command" ]; then
+		echo "$user_command"
+	elif command_exists "tree"; then
+		echo "$TREE_COMMAND"
+	else
+		echo "$custom_tree_command"
+	fi
+}
+
+tree_user_command() {
+	get_tmux_option "$TREE_COMMAND_OPTION" ""
+}
+
+tree_key() {
+	get_tmux_option "$TREE_OPTION" "$TREE_KEY"
+}
+
+tree_focus_key() {
+	get_tmux_option "$TREE_FOCUS_OPTION" "$TREE_FOCUS_KEY"
+}
+
+tree_pager() {
+	get_tmux_option "$TREE_PAGER_OPTION" "$TREE_PAGER"
+}
+
+tree_position() {
+	get_tmux_option "$TREE_POSITION_OPTION" "$TREE_POSITION"
+}
+
+tree_width() {
+	get_tmux_option "$TREE_WIDTH_OPTION" "$TREE_WIDTH"
+}
\ No newline at end of file
diff --git a/.tmux/scripts/variables.sh b/.tmux/scripts/variables.sh
new file mode 100755
index 0000000..4ebe5c3
--- /dev/null
+++ b/.tmux/scripts/variables.sh
@@ -0,0 +1,26 @@
+VAR_KEY_PREFIX="@sidebar-key"
+REGISTERED_PANE_PREFIX="@-sidebar-registered-pane"
+REGISTERED_SIDEBAR_PREFIX="@-sidebar-is-sidebar"
+MINIMUM_WIDTH_FOR_SIDEBAR="71"
+
+TREE_KEY="Tab"
+TREE_OPTION="@sidebar-tree"
+
+TREE_FOCUS_KEY="Bspace"
+TREE_FOCUS_OPTION="@sidebar-tree-focus"
+
+TREE_COMMAND="tree"
+TREE_COMMAND_OPTION="@sidebar-tree-command"
+
+TREE_PAGER='sh -c "LESS= less --dumb --chop-long-lines --tilde --IGNORE-CASE --RAW-CONTROL-CHARS"'
+TREE_PAGER_OPTION="@sidebar-tree-pager"
+
+TREE_POSITION="left"
+TREE_POSITION_OPTION="@sidebar-tree-position"
+
+TREE_WIDTH="40"
+TREE_WIDTH_OPTION="@sidebar-tree-width"
+
+SUPPORTED_TMUX_VERSION="1.9"
+
+SIDEBAR_DIR="$HOME/.tmux/sidebar"
\ No newline at end of file
diff --git a/.tmux/sidebar.tmux b/.tmux/sidebar.tmux
new file mode 100755
index 0000000..be24390
--- /dev/null
+++ b/.tmux/sidebar.tmux
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+SCRIPTS_DIR="$CURRENT_DIR/scripts"
+
+source "$SCRIPTS_DIR/helpers.sh"
+source "$SCRIPTS_DIR/variables.sh"
+source "$SCRIPTS_DIR/tree_helpers.sh"
+
+set_default_key_binding_options() {
+	local tree_command="$(tree_command)"
+	local tree_key="$(tree_key)"
+	local tree_focus_key="$(tree_focus_key)"
+	local tree_pager="$(tree_pager)"
+	local tree_position="$(tree_position)"
+	local tree_width="$(tree_width)"
+
+	set_tmux_option "${VAR_KEY_PREFIX}-${tree_key}" "$tree_command | ${tree_pager},${tree_position},${tree_width}"
+	set_tmux_option "${VAR_KEY_PREFIX}-${tree_focus_key}" "$tree_command | ${tree_pager},${tree_position},${tree_width},focus"
+}
+
+set_key_bindings() {
+	local stored_key_vars="$(stored_key_vars)"
+	local search_var
+	local key
+	local pattern
+	for option in $stored_key_vars; do
+		key="$(get_key_from_option_name "$option")"
+		value="$(get_value_from_option_name "$option")"
+		tmux bind-key "$key" run-shell "$SCRIPTS_DIR/toggle.sh '$value' '#{pane_id}'"
+	done
+}
+
+main() {
+	set_default_key_binding_options
+	set_key_bindings
+}
+main
\ No newline at end of file
diff --git a/.tmux/sidebar/directory_widths.txt b/.tmux/sidebar/directory_widths.txt
new file mode 100644
index 0000000..cc95d40
--- /dev/null
+++ b/.tmux/sidebar/directory_widths.txt
@@ -0,0 +1 @@
+/Users/eragos/.dotfiles/.tmux/scripts	115