updated max_hist default to 10,000 and added an option to remove the cap by setting it to -1

nix/hm-module.nix

@@ -224,7 +224,7 @@ in
       };
       maxHistoryEntries = lib.mkOption {
         type = lib.types.int;
-        default = 1000;
+        default = 10000;
         description = "The maximum number of entries to keep in the command history";
       };
       interactiveComments = lib.mkOption {

src/readline/history.rs

@@ -217,12 +217,13 @@ impl History {
       format!("{home}/.shed_history")
     }));
     let mut entries = read_hist_file(&path)?;
-    // Enforce max_hist limit on loaded entries
-    if entries.len() > max_hist {
-      entries = entries.split_off(entries.len() - max_hist);
+    // Enforce max_hist limit on loaded entries (negative = unlimited)
+    if max_hist >= 0 && entries.len() > max_hist as usize {
+      entries = entries.split_off(entries.len() - max_hist as usize);
     }
     let search_mask = dedupe_entries(&entries);
     let cursor = search_mask.len();
+    let max_size = if max_hist < 0 { None } else { Some(max_hist as u32) };
     Ok(Self {
       path,
       entries,
@@ -233,7 +234,7 @@ impl History {
       cursor,
       //search_direction: Direction::Backward,
       ignore_dups,
-      max_size: Some(max_hist as u32),
+      max_size,
     })
   }
 

src/shopt.rs

@@ -140,7 +140,7 @@ pub struct ShOptCore {
   pub dotglob: bool,
   pub autocd: bool,
   pub hist_ignore_dupes: bool,
-  pub max_hist: usize,
+  pub max_hist: isize,
   pub interactive_comments: bool,
   pub auto_hist: bool,
   pub bell_enabled: bool,
@@ -178,10 +178,10 @@ impl ShOptCore {
         self.hist_ignore_dupes = val;
       }
       "max_hist" => {
-        let Ok(val) = val.parse::<usize>() else {
+        let Ok(val) = val.parse::<isize>() else {
           return Err(ShErr::simple(
             ShErrKind::SyntaxErr,
-            "shopt: expected a positive integer for max_hist value",
+            "shopt: expected an integer for max_hist value (-1 for unlimited)",
           ));
         };
         self.max_hist = val;
@@ -256,7 +256,7 @@ impl ShOptCore {
       }
       "max_hist" => {
         let mut output = String::from(
-          "Maximum number of entries in the command history file (default '.shedhist')\n",
+          "Maximum number of entries in the command history file (-1 for unlimited)\n",
         );
         output.push_str(&format!("{}", self.max_hist));
         Ok(Some(output))
@@ -318,7 +318,7 @@ impl Default for ShOptCore {
       dotglob: false,
       autocd: false,
       hist_ignore_dupes: true,
-      max_hist: 1000,
+      max_hist: 10_000,
       interactive_comments: true,
       auto_hist: true,
       bell_enabled: true,