Make the history path more central

TODO.md

@@ -31,13 +31,19 @@
 - [x] finish operator type-checking
 - [x] Config file loading
 - [x] block variable captures
-- [ ] Input/output types
+- [x] improved history and config paths
 - [ ] Support for `$in`
 - [ ] ctrl-c support
 - [ ] operator overflow
-- [ ] Overlays (replacement for `autoenv`)
-  
+- [ ] shells
+- [ ] plugins
+- [ ] dataframes
+
+## Post-nushell merge:
+- [ ] Overlays (replacement for `autoenv`), adding modules to shells
+- [ ] Input/output types
+- [ ] let [first, rest] = [1, 2, 3] (design question: how do you pattern match a table?)
+
 ## Maybe: 
 - [ ] default param values?
 - [ ] Unary not?
-- [ ] let [first, rest] = [1, 2, 3] (design question: how do you pattern match a table?)

src/main.rs

@@ -143,19 +143,24 @@ fn main() -> Result<()> {
             }
         }
 
+        let history_path = if let Some(mut history_path) = nu_path::config_dir() {
+            history_path.push("nushell");
+            history_path.push("history.txt");
+
+            Some(history_path)
+        } else {
+            None
+        };
+
         loop {
-            let mut line_editor = Reedline::create()
+            let line_editor = Reedline::create()
                 .into_diagnostic()?
-                .with_history(Box::new(
-                    FileBackedHistory::with_file(1000, "history.txt".into()).into_diagnostic()?,
-                ))
-                .into_diagnostic()?
-                .with_highlighter(Box::new(NuHighlighter {
-                    engine_state: engine_state.clone(),
-                }))
                 .with_completion_action_handler(Box::new(FuzzyCompletion {
                     completer: Box::new(completer.clone()),
                 }))
+                .with_highlighter(Box::new(NuHighlighter {
+                    engine_state: engine_state.clone(),
+                }))
                 // .with_completion_action_handler(Box::new(
                 //     ListCompletionHandler::default().with_completer(Box::new(completer)),
                 // ))
@@ -163,6 +168,17 @@ fn main() -> Result<()> {
                     engine_state: engine_state.clone(),
                 }));
 
+            let mut line_editor = if let Some(history_path) = history_path.clone() {
+                line_editor
+                    .with_history(Box::new(
+                        FileBackedHistory::with_file(1000, history_path.clone())
+                            .into_diagnostic()?,
+                    ))
+                    .into_diagnostic()?
+            } else {
+                line_editor
+            };
+
             let prompt = update_prompt(
                 PROMPT_COMMAND,
                 &engine_state,