feat: add option to use tmux display-popup (#3058)

This is a "continuation" of #1177 - which was a draft that used FIFOs
(named pipes) to get output from the popup, however this causes popup
not being closed properly, so in this PR I use tmpfile to store the
result and read after popup closes. @ellie could you review this PR
please?

P.S. Thank you @immae for sharing your idea!

## Feature
+ Option to use tmux popup window in `config.toml`
+ Customize window width/height in `config.toml`
+ Tmux display-popup for `zsh, bash, fish`

## Checks
- [x] I am happy for maintainers to push small adjustments to this PR,
to speed up the review cycle
- [x] I have checked that there are no existing pull requests for the
same thing

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/crates/atuin-client/config.toml b/crates/atuin-client/config.toml
index 94f4a180..69cfea84 100644
--- a/crates/atuin-client/config.toml
+++ b/crates/atuin-client/config.toml
@@ -296,6 +296,22 @@ records = true
 ## Default filter mode can be overridden with the filter_mode setting.
 # filters = [ "global", "host", "session", "session-preload", "workspace", "directory" ]
 
+[tmux]
+## Enable using atuin with tmux popup (requires tmux >= 3.2)
+## When enabled and running inside tmux, Atuin will use a popup window for interactive search.
+## Set to false to disable the popup.
+## This can also be controlled with the ATUIN_TMUX_POPUP environment variable.
+## Note: tmux popup is currently supported in zsh, bash, and fish shells.
+# enabled = true
+
+## Width of the tmux popup window
+## Can be a percentage, or integer (e.g. "100" means 100 characters wide)
+# width = "80%"
+
+## Height of the tmux popup window
+## Can be a percentage, or integer (e.g. "100" means 100 lines tall)
+# height = "60%"
+
 [ui]
 ## Columns to display in the interactive search, from left to right.
 ## The selection indicator (" > ") is always shown first implicitly.