refactor: preview_auto to use enum and different option (#1991)

* refactor: preview_auto to use enum and different option

* fix: typo

2 files changed, 37 insertions, 9 deletions

diff --git a/crates/atuin-client/config.toml b/crates/atuin-client/config.toml
index 415fd441..e9415851 100644
--- a/crates/atuin-client/config.toml
+++ b/crates/atuin-client/config.toml
@@ -71,12 +71,7 @@
 
 ## enable or disable showing a preview of the selected command
 ## useful when the command is longer than the terminal width and is cut off
-# show_preview = false
-
-## enable or disable automatic preview. It shows a preview, if the command is
-## longer than the width of the terminal. It respects max_preview_height.
-## (default: true)
-# show_preview_auto = true
+# show_preview = true
 
 ## what to do when the escape key is pressed when searching
 ## possible values: return-original, return-query
@@ -208,3 +203,10 @@ enter_accept = true
 # This ensures that sync v2 is enabled for new installs only
 # In a later release it will become the default across the board
 records = true
+
+[preview]
+## which preview strategy to use to calculate the preview height (respects max_preview_height).
+## possible values: auto, static
+## auto: length of the selected command.
+## static: length of the longest command stored in the history.
+# strategy = auto
diff --git a/crates/atuin-client/src/settings.rs b/crates/atuin-client/src/settings.rs
index 0497fb64..675fb307 100644
--- a/crates/atuin-client/src/settings.rs
+++ b/crates/atuin-client/src/settings.rs
@@ -338,6 +338,31 @@ pub struct Keys {
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct Preview {
+    pub strategy: PreviewStrategy,
+}
+
+impl Default for Preview {
+    fn default() -> Self {
+        Self {
+            strategy: PreviewStrategy::Auto,
+        }
+    }
+}
+
+// The preview height strategy also takes max_preview_height into account.
+#[derive(Clone, Debug, Deserialize, Copy, PartialEq, Eq, ValueEnum, Serialize)]
+pub enum PreviewStrategy {
+    // Preview height is calculated for the length of the selected command.
+    #[serde(rename = "auto")]
+    Auto,
+
+    // Preview height is calculated for the length of the longest command stored in the history.
+    #[serde(rename = "static")]
+    Static,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
 pub struct Settings {
     pub dialect: Dialect,
     pub timezone: Timezone,
@@ -358,7 +383,6 @@ pub struct Settings {
     pub inline_height: u16,
     pub invert: bool,
     pub show_preview: bool,
-    pub show_preview_auto: bool,
     pub max_preview_height: u16,
     pub show_help: bool,
     pub show_tabs: bool,
@@ -399,6 +423,9 @@ pub struct Settings {
     pub keys: Keys,
 
     #[serde(default)]
+    pub preview: Preview,
+
+    #[serde(default)]
     pub dotfiles: dotfiles::Settings,
 
     // This is automatically loaded when settings is created. Do not set in
@@ -615,8 +642,7 @@ impl Settings {
             .set_default("filter_mode", "global")?
             .set_default("style", "auto")?
             .set_default("inline_height", 0)?
-            .set_default("show_preview", false)?
-            .set_default("show_preview_auto", true)?
+            .set_default("show_preview", true)?
             .set_default("max_preview_height", 4)?
             .set_default("show_help", true)?
             .set_default("show_tabs", true)?