From 6be07008e07886f69511fef16a83b7a99518d830 Mon Sep 17 00:00:00 2001
From: sloum <sloum@colorfield.space>
Date: Sun, 9 Feb 2020 22:44:16 -0800
Subject: [PATCH] Adds auto-indent feature

---
 config.h |  5 ++++-
 hermes.c | 34 +++++++++++++++++++++++++++-------
 2 files changed, 31 insertions(+), 8 deletions(-)

diff --git a/config.h b/config.h
index 2bbe5b6..f7c5c8e 100644
--- a/config.h
+++ b/config.h
@@ -9,9 +9,12 @@
 // Set global tab width for the editor here
 static const int tabwidth = 4;
 
-// Turn on or off paren matching for: (, {, [
+// Turn on or off paren matching for: (, {, [, ", `
 static const int MATCH_PARENS = 1;
 
+// Auto-indent on known filetypes
+static const int AUTO_INDENT = 1;
+
 /* 
  * Values from 1 to 256 representing 256 color/8-bit pallate
  * see: https://en.wikipedia.org/wiki/ANSI_escape_code#8-bit
diff --git a/hermes.c b/hermes.c
index 86d1530..3b1082b 100644
--- a/hermes.c
+++ b/hermes.c
@@ -555,6 +555,22 @@ void editorInsertNewline() {
   }
   E.cy++;
   E.cx = 0;
+  if (AUTO_INDENT && E.syntax) {
+    erow *row = &E.row[E.cy-1];
+    int tabs = 0;
+    int i = 0;
+    while (i < row->size && row->chars[i] == '\t') {
+      tabs++;
+      i++;
+    }
+    char lastChar = row->chars[row->size - 1];
+    if (lastChar == '{' || lastChar == '[') tabs++;
+    if (E.row[E.cy].size > E.cx && E.row[E.cy].chars[E.cx + 1] == '}') tabs--;
+    while (tabs > 0) {
+      editorInsertChar('\t');
+      tabs--;
+    }
+  }
 }
 
 void editorUpdatePaste(char *str, int len) {
@@ -1290,19 +1306,23 @@ void editorCommandKp(int c) {
         }
       }
       break;
+    case 'O':
+      {
+        int docStart = E.cy ? 0 : 1;
+        editorMoveCursor(ARROW_UP);
+        E.cx = (E.cy >= E.numRows || docStart) ? 0 : E.row[E.cy].size;
+        E.mode = InputMode;
+        if (!docStart) editorMoveCursor(ARROW_RIGHT);
+        editorInsertNewline();
+        if (docStart) editorMoveCursor(ARROW_UP);
+      }
+      break;
     case 'o':
       E.cx = (E.cy >= E.numRows) ? 0 : E.row[E.cy].size;
       E.mode = InputMode;
       editorMoveCursor(ARROW_RIGHT);
       editorInsertNewline();
       break;
-    case 'O':
-      E.cx = 0;
-      E.mode = InputMode;
-      editorInsertNewline();
-      editorMoveCursor(ARROW_UP);
-      editorMoveCursor(ARROW_RIGHT);
-      break;
     case 'x':
       while (counter > 0) {
         editorUpdatePaste(&E.row[E.cy].chars[E.cx], 1);