From 649c2b3e623c26228faf9630b983ebba9c68e009 Mon Sep 17 00:00:00 2001
From: Jonathan LEI <me@xjonathan.dev>
Date: Sat, 10 Dec 2022 09:56:12 +0000
Subject: [PATCH 1/2] Make prompt suggestions greyed out

---
 book/src/themes.md          |  1 +
 helix-term/src/ui/prompt.rs | 19 ++++++++++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/book/src/themes.md b/book/src/themes.md
index 392b5f8c956a..bebc7b47bedf 100644
--- a/book/src/themes.md
+++ b/book/src/themes.md
@@ -268,6 +268,7 @@ These scopes are used for theming the editor interface.
 | `ui.help`                   | Description box for commands                                                                   |
 | `ui.text`                   | Command prompts, popup text, etc.                                                              |
 | `ui.text.focus`             |                                                                                                |
+| `ui.text.inactive`          | Same as `ui.text` but when the text is inactive (e.g. suggestions)                             |
 | `ui.text.info`              | The key: command text in `ui.popup.info` boxes                                                 |
 | `ui.virtual.ruler`          | Ruler columns (see the [`editor.rulers` config][editor-section])                               |
 | `ui.virtual.whitespace`     | Visible whitespace characters                                                                 |
diff --git a/helix-term/src/ui/prompt.rs b/helix-term/src/ui/prompt.rs
index b19b9a9fce90..5fb6745a90e5 100644
--- a/helix-term/src/ui/prompt.rs
+++ b/helix-term/src/ui/prompt.rs
@@ -352,6 +352,7 @@ impl Prompt {
         let prompt_color = theme.get("ui.text");
         let completion_color = theme.get("ui.menu");
         let selected_color = theme.get("ui.menu.selected");
+        let suggestion_color = theme.get("ui.text.inactive");
         // completion
 
         let max_len = self
@@ -450,21 +451,29 @@ impl Prompt {
         // render buffer text
         surface.set_string(area.x, area.y + line, &self.prompt, prompt_color);
 
-        let input: Cow<str> = if self.line.is_empty() {
+        let (input, is_suggestion): (Cow<str>, bool) = if self.line.is_empty() {
             // latest value in the register list
-            self.history_register
+            match self
+                .history_register
                 .and_then(|reg| cx.editor.registers.last(reg))
                 .map(|entry| entry.into())
-                .unwrap_or_else(|| Cow::from(""))
+            {
+                Some(value) => (value, true),
+                None => (Cow::from(""), false),
+            }
         } else {
-            self.line.as_str().into()
+            (self.line.as_str().into(), false)
         };
 
         surface.set_string(
             area.x + self.prompt.len() as u16,
             area.y + line,
             &input,
-            prompt_color,
+            if is_suggestion {
+                suggestion_color
+            } else {
+                prompt_color
+            },
         );
     }
 }

From 3ee53fcbd06b904f124fc2aaf731d9d56d90953c Mon Sep 17 00:00:00 2001
From: Jonathan LEI <me@xjonathan.dev>
Date: Sat, 10 Dec 2022 09:56:37 +0000
Subject: [PATCH 2/2] Set ui.text.inactive for official themes

---
 base16_theme.toml | 1 +
 theme.toml        | 1 +
 2 files changed, 2 insertions(+)

diff --git a/base16_theme.toml b/base16_theme.toml
index 63fc2f790e72..268a38df61bd 100644
--- a/base16_theme.toml
+++ b/base16_theme.toml
@@ -7,6 +7,7 @@
 "ui.linenr.selected" = { fg = "white", bg = "black", modifiers = ["bold"] }
 "ui.selection" = { fg = "black", bg = "blue" }
 "ui.selection.primary" = { fg = "white", bg = "blue" }
+"ui.text.inactive" = { fg = "gray" }
 "comment" = { fg = "gray" }
 "ui.statusline" = { fg = "black", bg = "white" }
 "ui.statusline.inactive" = { fg = "gray", bg = "white" }
diff --git a/theme.toml b/theme.toml
index 054093195a87..c7b5dc84e7e0 100644
--- a/theme.toml
+++ b/theme.toml
@@ -54,6 +54,7 @@ label = "honey"
 
 "ui.text" = { fg = "lavender" }
 "ui.text.focus" = { fg = "white" }
+"ui.text.inactive" = "sirocco"
 "ui.virtual" = { fg = "comet" }
 
 "ui.virtual.indent-guide" = { fg = "comet" }