add importedBy selector

code.js

@@ -77,6 +77,7 @@ function selectPkg(json) {
 	$('#pkgname').text("none")
 	$('#doc').text("")
 	$('#imports').html("")
+	$('#importedBy').html("")
 	$('#path').text("")
 	return
     }
@@ -92,20 +93,9 @@ function selectPkg(json) {
 
     // Show imports in a drop-down menu.
     // Selecting an import acts like clicking on that package in the tree.
-    var imports = $('#imports')
-    imports.html("")
-    var option = document.createElement("option")
-    option.textContent = "..."
-    option.value = "-1"
-    imports.append(option)
-    for (var i in json.Imports) {
-	var imp = json.Imports[i]
-	option = document.createElement("option")
-	option.textContent = packages[imp].PkgPath
-	option.value = "" + imp // package index, used by onSelectImport
-	imports.append(option)
-    }
-
+    addImports($('#imports'), json.Imports)
+    addImports($('#importedBy'), json.ImportedBy)
+
     // Show "break edges" buttons.
     var html = ""
     var path = [].concat(json.Path).reverse() // from root to selected package
@@ -131,6 +121,23 @@ function unbreak(i, j) {
     document.location = "/unbreak?from=" + i + "&to=" + j
 }
 
+// addImports adds option elements to the select element,
+// one per package index in the packageIDs array.
+function addImports(select, packageIDs) {
+    select.html("")
+    var option = document.createElement("option")
+    option.textContent = "..."
+    option.value = "-1"
+    select.append(option)
+    for (var i in packageIDs) {
+	var imp = packageIDs[i]
+	option = document.createElement("option")
+	option.textContent = packages[imp].PkgPath
+	option.value = "" + imp // package index, used by onSelectImport
+	select.append(option)
+    }
+}
+
 // onSelectImport is called by the imports dropdown.
 function onSelectImport(sel) {
     if (sel.value >= 0) {

go.mod

@@ -3,22 +3,6 @@ module github.com/adonovan/spaghetti
 go 1.16
 
 require (
-	contrib.go.opencensus.io/exporter/ocagent v0.4.12 // indirect
-	github.com/Azure/azure-amqp-common-go v1.1.4 // indirect
-	github.com/Azure/go-autorest v11.1.2+incompatible // indirect
-	github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd // indirect
-	github.com/gohugoio/hugo v0.82.0 // indirect
-	github.com/golang/snappy v0.0.1 // indirect
-	github.com/kyokomi/emoji v2.2.4+incompatible // indirect
-	github.com/markbates/inflect v1.0.4 // indirect
-	github.com/opentracing/opentracing-go v1.0.2 // indirect
-	github.com/tidwall/pretty v0.0.0-20190325153808-1166b9ac2b65 // indirect
-	github.com/uber-go/atomic v1.3.2 // indirect
-	github.com/uber/jaeger-client-go v2.15.0+incompatible // indirect
-	github.com/uber/jaeger-lib v1.5.0 // indirect
-	github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c // indirect
-	github.com/xdg/stringprep v1.0.0 // indirect
-	go.mongodb.org/mongo-driver v1.0.1 // indirect
 	golang.org/x/tools v0.1.1-0.20210319172145-bda8f5cee399
-	pack.ag/amqp v0.11.0 // indirect
+	golang.org/x/tools/gopls v0.6.9 // indirect
 )