From bea80dbfe722c7bb13e19665ddbadea03b8b6293 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Mon, 17 May 2021 16:58:19 +0530
Subject: implement reverse cycle through completions

---
 src/app.rs     | 5 ++++-
 src/command.rs | 6 +++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/app.rs b/src/app.rs
index aba71f8..266c28b 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -1042,7 +1042,10 @@ impl<'ctx> AppState<'ctx> {
                                 Keycode::Up => self.command_box.hist_prev(),
                                 Keycode::Down => self.command_box.hist_next(),
                                 Keycode::Return => self.eval_command(),
-                                Keycode::Tab => self.command_box.complete_next(&self.lisp_env),
+                                Keycode::Tab if keymod == Mod::LSHIFTMOD => {
+                                    self.command_box.complete(&self.lisp_env, true)
+                                }
+                                Keycode::Tab => self.command_box.complete(&self.lisp_env, false),
                                 Keycode::Escape => {
                                     self.command_box.clear();
                                     self.message.text.clear();
diff --git a/src/command.rs b/src/command.rs
index 26aeb05..6e9f900 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -224,14 +224,14 @@ impl CommandBox {
         self.invalidate_completions();
     }
 
-    pub fn complete_next(&mut self, env_list: &[Environment]) {
+    pub fn complete(&mut self, env_list: &[Environment], reverse: bool) {
         let c = self.cursor;
         // completions exist, fill with next completion
         if let Some(cs) = &mut self.completions {
             self.cursor = cs.trigger_idx;
             let prev_len = cs.get().len();
             // skips over the first empty completion
-            let new_insertion = cs.next();
+            let new_insertion = if reverse { cs.prev() } else { cs.next() };
             self.text = format!(
                 "{}{}{}",
                 &self.text[..self.cursor],
@@ -249,7 +249,7 @@ impl CommandBox {
                     .map(|&s| s.to_owned())
                     .collect(),
             ));
-            self.complete_next(env_list)
+            self.complete(env_list, reverse)
         }
     }
 }
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