Codearea: Added tab-size and tab insertion to the widget

asyncron/base/admin.py

@@ -11,7 +11,7 @@ class BaseModelAdmin( admin.ModelAdmin ):
 	def formfield_for_dbfield( self, db_field, **kwargs ):
 		formfield = super().formfield_for_dbfield(db_field, **kwargs)
 		if isinstance( formfield, JSONField ):
-			formfield.widget = Codearea( language = "json" )
+			formfield.widget = Codearea( language = "json-pretty" )
 
 		custom_widget = getattr(self, "field_widgets", {}).get(db_field.name, None)
 		if custom_widget:

asyncron/templates/asyncron/codearea-widget.html

@@ -35,6 +35,7 @@
 		padding: 5px;
 		font-size: 1em;
 		border-radius: 3px;
+		tab-size: {{ tab_size }};
 	}
 </style>
 
@@ -44,11 +45,65 @@
 		const textarea = codearea.querySelector('textarea');
 		const code = codearea.querySelector('code');
 
-		textarea.addEventListener('input', (e) => {
-			code.innerHTML = textarea.value;
+		//function encode(e){return e.replace(/[^]/g,function(e){return"&#"+e.charCodeAt(0)+";"})}
+		function sync(){
+			code.innerHTML = new Option(textarea.value).innerHTML; //encode(textarea.value);
 			delete code.dataset.highlighted;
 			hljs.highlightElement( code )
-		});
+		}
 		hljs.highlightElement( code )
+
+		textarea.addEventListener('keydown', function o(e){
+			if (e.key != 'Tab') return;
+
+			e.preventDefault();
+
+			//Largly From: https://stackoverflow.com/a/45396754
+			if (this.selectionStart == this.selectionEnd){
+				document.execCommand('insertText', false, "\t");
+				return;
+			}
+			
+			// Block indent/unindent trashes undo stack.
+			// Select whole lines
+			var selStart = this.selectionStart;
+			var selEnd = this.selectionEnd;
+			var text = this.value;
+			while (selStart > 0 && text[selStart-1] != '\n')
+				selStart--;
+			while (selEnd > 0 && text[selEnd-1]!='\n' && selEnd < text.length)
+				selEnd++;
+
+			// Get selected text
+			var lines = text.substr(selStart, selEnd - selStart).split('\n');
+
+			// Insert tabs
+			for (var i=0; i<lines.length; i++)
+			{
+				// Don't indent last line if cursor at start of line
+				if (i==lines.length-1 && lines[i].length==0)
+					continue;
+
+				// Tab or Shift+Tab?
+				if (e.shiftKey)
+				{
+					if (lines[i].startsWith('\t'))
+						lines[i] = lines[i].substr(1);
+					else if (lines[i].startsWith("    "))
+						lines[i] = lines[i].substr(4);
+				}
+				else
+					lines[i] = "\t" + lines[i];
+			}
+			lines = lines.join('\n');
+
+			// Update the text area
+			this.value = text.substr(0, selStart) + lines + text.substr(selEnd);
+			this.selectionStart = selStart;
+			this.selectionEnd = selStart + lines.length;
+			sync();
+		})
+		textarea.addEventListener('input', () => sync() );
+
 	})()
 </script>

asyncron/widgets.py

@@ -1,18 +1,65 @@
-
 from django.template import loader
 from django.forms import Textarea
 
+import json
 
 class Codearea( Textarea ):
 
-	def __init__( self, *args, language = "auto", **kwargs ):
+	def __init__( self,
+		*args,
+		language = "auto",
+		spell_check = False,
+		extra_rows = 2, extra_cols = 10,
+		min_rows = 10, min_cols = 40,
+		tab_size = 4,
+		**kwargs
+	):
 		self.language = language
+		self.spell_check = spell_check
+		self.extra_rows = extra_rows
+		self.extra_cols = extra_cols
+		self.min_rows = min_rows
+		self.min_cols = min_cols
+		self.tab_size = tab_size
+
 		super().__init__( *args, **kwargs )
 
 	def render( self, name, value, attrs = None, renderer = None ):
+		if not self.spell_check:
+			attrs.update({
+				"autocomplete": "off",
+				"autocorrect": "off",
+				"autocapitalize": "off",
+				"spellcheck": "false"
+			})
+
+		value = value or ""
+
+		if self.language == "json-pretty":
+			self.language = "json"
+			value = json.dumps(json.loads(value), indent = 4 )
+
+
+		if self.extra_rows is not False:
+			attrs.update(
+				rows = max( value.count("\n") + self.extra_rows, self.min_rows )
+			)
+
+		if self.extra_cols is not False:
+			try:
+				max_line_chars = max( len(line) + line.count("\t") * (self.tab_size - 1) for line in value.split("\n") )
+			except ValueError:
+				max_line_chars = 0
+
+			attrs.update(
+				cols = max( max_line_chars + self.extra_cols, self.min_cols )
+			)
+
+
 		return loader.get_template("asyncron/codearea-widget.html").render({
 			"textarea": super().render( name, value, attrs, renderer ),
 			"value": value,
 			"target": name,
-			"language": self.language
+			"tab_size": self.tab_size,
+			"language": self.language,
 		})