From 358ea6a37ccc3ee98f3680c9b4ee0dd0aa0781d2 Mon Sep 17 00:00:00 2001
From: Nathan Vegdahl <cessen@cessen.com>
Date: Sun, 13 Jun 2021 18:09:22 -0700
Subject: [PATCH] Implement command to change the indent-style setting of a
 document.

---
 helix-term/src/commands.rs  | 31 ++++++++++++++++++++++++++++++-
 helix-term/src/ui/editor.rs |  2 +-
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index b5f375631..94003c2e1 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -9,7 +9,7 @@ use helix_core::{
 };
 
 use helix_view::{
-    document::Mode,
+    document::{IndentStyle, Mode},
     view::{View, PADDING},
     Document, DocumentId, Editor, ViewId,
 };
@@ -979,6 +979,28 @@ mod cmd {
         doc.format(view.id)
     }
 
+    fn set_indent_style(editor: &mut Editor, args: &[&str], event: PromptEvent) {
+        use IndentStyle::*;
+
+        let style = match args.get(0) {
+            Some(arg) if "tabs".starts_with(&arg.to_lowercase()) => Some(Tabs),
+            Some(arg) if arg.len() == 1 => {
+                let ch = arg.chars().next().unwrap();
+                if ('1'..='8').contains(&ch) {
+                    Some(Spaces(ch.to_digit(10).unwrap() as u8))
+                } else {
+                    None
+                }
+            }
+            _ => None,
+        };
+
+        if let Some(s) = style {
+            let (_, doc) = editor.current();
+            doc.indent_style = s;
+        }
+    }
+
     fn earlier(editor: &mut Editor, args: &[&str], event: PromptEvent) {
         let uk = match args.join(" ").parse::<helix_core::history::UndoKind>() {
             Ok(uk) => uk,
@@ -1143,6 +1165,13 @@ mod cmd {
             fun: format,
             completer: None,
         },
+        Command {
+            name: "indent_style",
+            alias: None,
+            doc: "Set the indentation style for editing. ('t' for tabs or 1-8 for number of spaces.)",
+            fun: set_indent_style,
+            completer: None,
+        },
         Command {
             name: "earlier",
             alias: Some("ear"),
diff --git a/helix-term/src/ui/editor.rs b/helix-term/src/ui/editor.rs
index 65b114a64..5db68751c 100644
--- a/helix-term/src/ui/editor.rs
+++ b/helix-term/src/ui/editor.rs
@@ -501,7 +501,7 @@ impl EditorView {
         // Compute the individual info strings.
         let diag_count = format!("{}", doc.diagnostics().len());
         let indent_info = match doc.indent_style {
-            IndentStyle::Tabs => "tab",
+            IndentStyle::Tabs => "tabs",
             IndentStyle::Spaces(1) => "spaces:1",
             IndentStyle::Spaces(2) => "spaces:2",
             IndentStyle::Spaces(3) => "spaces:3",