From 4c28558c252df60bb4995f866f10c06f1632038e Mon Sep 17 00:00:00 2001
From: Nil Zork <ernest.micklei@gmail.com>
Date: Sun, 23 Feb 2025 15:28:09 +0100
Subject: [PATCH] Explore replaces object with same label

---
 CHANGES.md      |  4 ++++
 explorer.go     |  9 +++++++++
 index_tmpl.html |  2 +-
 service.go      | 26 ++++++++++++++++++--------
 4 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index 3ccd5dc..045438c 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,7 @@
+### v0.8.1
+
+ - Explore replaces object with same root label.
+
 ### v0.8.0
 
 - add SetDefault to make a Service globally accessing to add new structs.
diff --git a/explorer.go b/explorer.go
index 6f3d501..14010c6 100644
--- a/explorer.go
+++ b/explorer.go
@@ -138,6 +138,15 @@ func (e *explorer) updateObjectAt(row, col int, updater func(access objectAccess
 	e.putObjectStartingAt(row, col, updater(old), Row(row))
 }
 
+func (e *explorer) putObjectAt(row, col int, access objectAccess) {
+	r, ok := e.accessMap[row]
+	if !ok {
+		r = map[int]objectAccess{}
+		e.accessMap[row] = r
+	}
+	r[col] = access
+}
+
 func (e *explorer) putObjectStartingAt(row, col int, access objectAccess, option ExploreOption) {
 	r, ok := e.accessMap[row]
 	if !ok {
diff --git a/index_tmpl.html b/index_tmpl.html
index 56b3e59..0503364 100644
--- a/index_tmpl.html
+++ b/index_tmpl.html
@@ -164,7 +164,7 @@
                             break;
                         case "auto":
                         default:
-                            toggleButton.textContent = "🔄";
+                            toggleButton.textContent = "★";
                             toggleButton.title = "Auto Theme";
                             break;
                     }
diff --git a/service.go b/service.go
index 023c6dc..07b0852 100644
--- a/service.go
+++ b/service.go
@@ -21,7 +21,8 @@ type Service interface {
 	// Dump writes an HTML file for displaying the current state of the explorer and its entries.
 	Dump()
 
-	// Explore adds a new entry (next available row in column 0) for a value unless it cannot be explored.
+	// Explore adds or replaces (matching on label) a new entry for a value unless it cannot be explored.
+	// The object will be placed on the next available column on row 1.
 	Explore(label string, value any, options ...ExploreOption) Service
 
 	// ExplorePath adds a new entry for a value at the specified access path unless it cannot be explored.
@@ -104,20 +105,15 @@ func (s *service) serveIndex(w http.ResponseWriter, _ *http.Request) {
 	}
 }
 
-// Explore adds a new entry (next available row in column 0) for a value if it can be explored.
+// Explore adds or replaces a new entry (next available row in column 0) for a value if it can be explored.
 func (s *service) Explore(label string, value any, options ...ExploreOption) Service {
 	defer s.protect()()
 
-	row, column := 0, 0
-	placement := Row(row)
-	if len(options) > 0 {
-		placement = options[0]
-		row, column = options[0].placement(s.explorer)
-	}
 	if !canExplore(value) {
 		slog.Info("value can not be explored", "value", value)
 		return s
 	}
+
 	oa := objectAccess{
 		isRoot:    true,
 		object:    value,
@@ -127,6 +123,20 @@ func (s *service) Explore(label string, value any, options ...ExploreOption) Ser
 		typeName:  fmt.Sprintf("%T", value),
 	}
 
+	// are we replacing an object access?
+	_, oldRow, oldcolumn, ok := s.explorer.rootAccessWithLabel(label)
+	if ok {
+		s.explorer.putObjectAt(oldRow, oldcolumn, oa)
+		return s
+	}
+
+	// add as new
+	row, column := 0, 0
+	placement := Row(0)
+	if len(options) > 0 {
+		placement = options[0]
+		row, column = options[0].placement(s.explorer)
+	}
 	s.explorer.putObjectStartingAt(row, column, oa, placement)
 	return s
 }