Experiment: move PWD and Git info from shell prompt to tmux pane titles

I'm just trying this on for size for now but it looks pretty:

https://eseth.org/2019/tmux-status-line.html

Pros:

- It reduces a bit of CLI clutter and gives a single, stable place to
  look for certain info.
- You can see infos even when running full-screen CLI programs.

Cons:

- You lose a bit of contextual info when scrolling through the
  scrollback since you can't see the current directory or current Git
  hash next to the command you typed. In practice I haven't really
  missed it so far.
- Tmux does not wait for external commands to finish before drawing the
  UI so in order to view changes in near real-time this requires a fair
  bit of Zsh machinery to manually tell tmux to refresh after changing
  directories or running Git commands.

Author: whiteinge

.tmux.conf

@@ -101,16 +101,25 @@ set -g message-style "fg=black,bg=green"
 setw -g window-status-bell-style "fg=black,bg=green,blink"
 setw -g window-status-current-style "fg=blue,bg=white"
 
-# Call out the active pane a bit more.
+set -g pane-border-status top
+
+set -g pane-border-style "fg=terminal,bg=terminal"
 set -g pane-active-border-style "fg=black,bg=brightblack"
 
-# Only show the pane title if it's a custom title.
-# (The default hostname title is just noise.)
-set -g pane-border-format "#[fg=black#,bg=brightblack]#{pane_id} #{pane_index}#{?pane_active,*,}#{?#{==:#{host},#{pane_title}},, #{pane_title}}"
+# Show pwd, git, and tmux pane info in pane title.
+# (Hides the default hostname #{pane_title}.)
+set -g pane-border-format "\
+#[fg=white,bg=black] \
+#(~/bin/git-prompt -c tmux #{pane_current_path} && tmux refresh -S)\
+#[align=right,fg=white,bg=black] \
+#{pane_id} \
+#{pane_index}\
+#{?pane_active,*,}\
+#{?#{==:#{host},#{pane_title}},, #{pane_title}} \
+"
 
 ### Status bar.
 set -g status-right-length 50
 set -g status-right "#[fg=cyan]#h"
-set -g pane-border-status bottom
 
 # vim:ft=tmux

.zsh_shouse_prompt

@@ -29,11 +29,7 @@ alias pr_bare="zstyle ':pr_nethack:' mode bare"
 
 # Set default mode when zsh is first loaded (not every time prompt is drawn)
 # Modes: full, compact, bare
-if [[ $LINES -lt 5 ]] ; then
-    zstyle ":pr_nethack:" mode bare
-else
-    zstyle ":pr_nethack:" mode compact
-fi
+zstyle ":pr_nethack:" mode bare
 zstyle ':pr_nethack:*' hooks pwd incog usr vcs venv jobs prompt
 zstyle ':pr_nethack:*' pet "d" # A domestic animal, the _tame dog_ (_Canis familiaris_)
 zstyle ':pr_nethack:*' pwd "%~"

.zshrc

@@ -303,8 +303,26 @@ function pman() {
 
 # }}}
 
+function refresh_tmux() {
+    tmux refresh -S
+}
+
+_last_cmd_was_git=0
+function last_command_was_git() {
+    [[ "$1" == git* ]] && _last_cmd_was_git=1
+}
+
+function refresh_tmux_on_git() {
+    if [[ "$_last_cmd_was_git" -eq 1 ]]; then
+        _last_cmd_was_git=0
+        tmux refresh -S
+    fi
+}
+
 # Run precmd functions
-precmd_functions=( precmd_prompt )
+preexec_functions=( last_command_was_git )
+chpwd_functions=( refresh_tmux )
+precmd_functions=( precmd_prompt refresh_tmux_on_git )
 
 # Allow OS or environment specific overrides:
 if [[ -r "$HOME/.zsh_customize" ]]; then