feat: support for Python.IndentationError

error_templates/python/indentation_error.go

@@ -1,14 +1,45 @@
 package python
 
-import lib "github.com/nedpals/errgoengine"
+import (
+	"fmt"
+
+	lib "github.com/nedpals/errgoengine"
+)
 
 var IndentationError = lib.ErrorTemplate{
 	Name:    "IndentationError",
 	Pattern: compileTimeError("IndentationError: unindent does not match any outer indentation level"),
 	OnGenExplainFn: func(cd *lib.ContextData, gen *lib.ExplainGenerator) {
-		gen.Add("The code is not indented properly")
+		gen.Add("This error occurs when there is a mismatch in the indentation levels in the code.")
 	},
 	OnGenBugFixFn: func(cd *lib.ContextData, gen *lib.BugFixGenerator) {
-		// TODO:
+		gen.Add("Correct the indentation", func(s *lib.BugFixSuggestion) {
+			// use the previous sibling's spacing as basis
+			prevSibling := cd.MainError.Nearest.PrevNamedSibling()
+			if prevSibling.Type() == "function_definition" {
+				prevSibling = prevSibling.ChildByFieldName("body").LastNamedChild()
+			}
+
+			fmt.Println(prevSibling.String())
+			spaces := cd.MainError.Document.LineAt(prevSibling.StartPosition().Line)[:prevSibling.StartPosition().Column]
+
+			s.AddStep("Ensure consistent indentation by using the correct spacing for each level of indentation.").
+				AddFix(lib.FixSuggestion{
+					NewText: "",
+					StartPosition: lib.Position{
+						Line: cd.MainError.Nearest.StartPosition().Line,
+					},
+					EndPosition: cd.MainError.Nearest.StartPosition(),
+				}).
+				AddFix(lib.FixSuggestion{
+					NewText: spaces,
+					StartPosition: lib.Position{
+						Line: cd.MainError.Nearest.StartPosition().Line,
+					},
+					EndPosition: lib.Position{
+						Line: cd.MainError.Nearest.StartPosition().Line,
+					},
+				})
+		})
 	},
 }

error_templates/python/test_files/indentation_error/test.txt

@@ -7,4 +7,21 @@ IndentationError: unindent does not match any outer indentation level
 ===
 template: "Python.IndentationError"
 ---
-The code is not indented properly
+# IndentationError
+This error occurs when there is a mismatch in the indentation levels in the code.
+```
+    print("Hello, world!")
+  print("This line is indented with two spaces instead of four.")
+  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+```
+## Steps to fix
+### Correct the indentation
+Ensure consistent indentation by using the correct spacing for each level of indentation.
+```diff
+def my_function():
+    print("Hello, world!")
+-   print("This line is indented with two spaces instead of four.")
++     print("This line is indented with two spaces instead of four.")
+
+```

node.go

@@ -49,6 +49,11 @@ func (n SyntaxNode) PrevSibling() SyntaxNode {
 	return WrapNode(n.Doc, cNode)
 }
 
+func (n SyntaxNode) PrevNamedSibling() SyntaxNode {
+	cNode := n.Node.PrevNamedSibling()
+	return WrapNode(n.Doc, cNode)
+}
+
 func (n SyntaxNode) NamedDescendantForPointRange(posRange Location) SyntaxNode {
 	sRange := posRange.Range()
 	cNode := n.Node.NamedDescendantForPointRange(sRange.StartPoint, sRange.EndPoint)