Merge pull request #1606 from alixander/nested-import

Fix link paths in nested imports

ci/release/changelogs/next.md

@@ -5,6 +5,7 @@
 
 #### Improvements 🧹
 
+- Globs are lazily-evaluated [#1552](https://github.com/terrastruct/d2/pull/1552)
 - Latex now includes Mathjax's ASM extension for more powerful Latex functionality [#1544](https://github.com/terrastruct/d2/pull/1544)
 - `font-color` works on Markdown [#1546](https://github.com/terrastruct/d2/pull/1546)
 - `font-color` works on arrowheads [#1582](https://github.com/terrastruct/d2/pull/1582)

d2ir/compile.go

@@ -833,8 +833,35 @@ func (c *compiler) updateLinks(m *Map) {
 			aida := IDA(f)
 			if len(bida) != len(aida) {
 				prependIDA := aida[:len(aida)-len(bida)]
-				kp := d2ast.MakeKeyPath(prependIDA)
-				s := d2format.Format(kp) + strings.TrimPrefix(f.Primary_.Value.ScalarString(), "root")
+				fullIDA := []string{"root"}
+				// With nested imports, a value may already have been updated with part of the absolute path
+				// E.g.,
+				// The import prepends path a b c
+				// The existing path is b c d
+				// So the new path is
+				// a b c
+				//   b c d
+				// -------
+				// a b c d
+			OUTER:
+				for i := 1; i < len(prependIDA); i += 2 {
+					for j := 0; i+j < len(prependIDA); j++ {
+						if prependIDA[i+j] != linkIDA[1+j] {
+							break
+						}
+						// Reached the end and all common
+						if i+j == len(prependIDA)-1 {
+							break OUTER
+						}
+					}
+					fullIDA = append(fullIDA, prependIDA[i])
+					fullIDA = append(fullIDA, prependIDA[i+1])
+				}
+				// Chop off "root"
+				fullIDA = append(fullIDA, linkIDA[1:]...)
+
+				kp := d2ast.MakeKeyPath(fullIDA)
+				s := d2format.Format(kp)
 				f.Primary_.Value = d2ast.MakeValueBox(d2ast.FlatUnquotedString(s)).ScalarBox().Unbox()
 			}
 		}

d2ir/import_test.go

@@ -84,6 +84,19 @@ label: meow`,
 				assertQuery(t, m, 0, 0, "root.layers.x.layers.y", "layers.x.y.link")
 			},
 		},
+		{
+			name: "boards-deep",
+			run: func(t testing.TB) {
+				m, err := compileFS(t, "index.d2", map[string]string{
+					"index.d2": `a.link: layers.b; layers: { b: @b }`,
+					"b.d2":     `b.link: layers.c; layers: { c: @c }`,
+					"c.d2":     `c.link: layers.d; layers: { d: @d }`,
+					"d.d2":     `d`,
+				})
+				assert.Success(t, err)
+				assertQuery(t, m, 0, 0, "root.layers.b.layers.c.layers.d", "layers.b.layers.c.c.link")
+			},
+		},
 		{
 			name: "steps-inheritence",
 			run: func(t testing.TB) {