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, 28 insertions, 0 deletions

diff --git a/crates/atuin-client/src/settings.rs b/crates/atuin-client/src/settings.rs
index d0e0ae2f..d849e816 100644
--- a/crates/atuin-client/src/settings.rs
+++ b/crates/atuin-client/src/settings.rs
@@ -393,6 +393,18 @@ pub struct Search {
     pub filters: Vec<FilterMode>,
 }
 
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct Tmux {
+    /// Enable using atuin with tmux popup (tmux >= 3.2)
+    pub enabled: bool,
+
+    /// Width of the tmux popup (percentage)
+    pub width: String,
+
+    /// Height of the tmux popup (percentage)
+    pub height: String,
+}
+
 impl Default for Preview {
     fn default() -> Self {
         Self {
@@ -438,6 +450,16 @@ impl Default for Search {
     }
 }
 
+impl Default for Tmux {
+    fn default() -> Self {
+        Self {
+            enabled: true,
+            width: "80%".to_string(),
+            height: "60%".to_string(),
+        }
+    }
+}
+
 // The preview height strategy also takes max_preview_height into account.
 #[derive(Clone, Debug, Deserialize, Copy, PartialEq, Eq, ValueEnum, Serialize)]
 pub enum PreviewStrategy {
@@ -720,6 +742,9 @@ pub struct Settings {
 
     #[serde(default)]
     pub kv: kv::Settings,
+
+    #[serde(default)]
+    pub tmux: Tmux,
 }
 
 impl Settings {
@@ -1040,6 +1065,9 @@ impl Settings {
             )?
             .set_default("theme.name", "default")?
             .set_default("theme.debug", None::<bool>)?
+            .set_default("tmux.enabled", true)?
+            .set_default("tmux.width", "80%")?
+            .set_default("tmux.height", "60%")?
             .set_default(
                 "prefers_reduced_motion",
                 std::env::var("NO_MOTION")