fix(web): respect case in POSIX file links

apps/web/src/filePathDisplay.test.ts

@@ -38,4 +38,10 @@ describe("formatWorkspaceRelativePath", () => {
       ),
     ).toBe("t3code/apps/web/src/session-logic.ts:501:9");
   });
+
+  it("keeps double-slash POSIX paths case-sensitive", () => {
+    expect(formatWorkspaceRelativePath("//tmp/project/probe.txt", "//tmp/Project")).toBe(
+      "//tmp/project/probe.txt",
+    );
+  });
 });

apps/web/src/filePathDisplay.ts

@@ -4,6 +4,7 @@ import {
   splitFilePathPosition,
   stripSlashPrefixedWindowsDrive,
 } from "@t3tools/client-runtime/markdown-links";
+import { isWindowsAbsolutePath } from "@t3tools/shared/path";
 
 function normalizePathSeparators(path: string): string {
   return path.replaceAll("\\", "/");
@@ -30,10 +31,13 @@ export function formatWorkspaceRelativePath(
       normalizePathSeparators(trimTrailingPathSeparators(workspaceRoot)),
     );
     const workspaceLabel = fileBasename(normalizedWorkspaceRoot);
-    const pathForCompare = normalizedPath.toLowerCase();
-    const workspaceForCompare = normalizedWorkspaceRoot.toLowerCase();
+    const caseInsensitive = isWindowsAbsolutePath(stripSlashPrefixedWindowsDrive(workspaceRoot));
+    const pathForCompare = caseInsensitive ? normalizedPath.toLowerCase() : normalizedPath;
+    const workspaceForCompare = caseInsensitive
+      ? normalizedWorkspaceRoot.toLowerCase()
+      : normalizedWorkspaceRoot;
     const workspaceWithSeparator = `${workspaceForCompare}/`;
-    const workspaceLabelWithSeparator = `${workspaceLabel.toLowerCase()}/`;
+    const workspaceLabelWithSeparator = `${caseInsensitive ? workspaceLabel.toLowerCase() : workspaceLabel}/`;
 
     if (pathForCompare === workspaceForCompare) {
       displayPath = workspaceLabel;

apps/web/src/markdown-links.test.ts

@@ -254,6 +254,61 @@ describe("resolveMarkdownFileLinkTarget", () => {
     });
   });
 
+  it("does not classify a case-distinct POSIX sibling as a workspace file", () => {
+    expect(
+      resolveMarkdownFileLinkMeta(
+        "/tmp/t3code-case-test/project/probe.txt",
+        "/tmp/t3code-case-test/Project",
+      ),
+    ).toMatchObject({
+      displayPath: "/tmp/t3code-case-test/project/probe.txt",
+      workspaceRelativePath: null,
+    });
+  });
+
+  it("keeps Windows workspace comparisons case-insensitive", () => {
+    expect(
+      resolveMarkdownFileLinkMeta("C:/Users/MIKE/Project/src/main.ts", "c:/users/mike/project"),
+    ).toMatchObject({
+      displayPath: "project/src/main.ts",
+      workspaceRelativePath: "src/main.ts",
+    });
+  });
+
+  it("keeps drive-root workspace comparisons case-insensitive", () => {
+    expect(resolveMarkdownFileLinkMeta("C:/Users/MIKE/project.ts", "c:/")).toMatchObject({
+      displayPath: "c:/Users/MIKE/project.ts",
+      workspaceRelativePath: "Users/MIKE/project.ts",
+    });
+  });
+
+  it("keeps backslash UNC workspace comparisons case-insensitive", () => {
+    expect(
+      resolveMarkdownFileLinkMeta(
+        "\\\\server\\share\\PROJECT\\src\\main.ts",
+        "\\\\Server\\Share\\Project",
+      ),
+    ).toMatchObject({
+      displayPath: "Project/src/main.ts",
+      workspaceRelativePath: "src/main.ts",
+    });
+  });
+
+  it.each([
+    ["/tmp/repo/file.ts", "/", "tmp/repo/file.ts"],
+    ["C:/Users/MIKE/file.ts", "c:/", "Users/MIKE/file.ts"],
+    ["\\\\server\\SHARE\\file.ts", "\\\\Server\\Share\\", "file.ts"],
+    ["/tmp/repo/file.ts%20", "/tmp/repo", "file.ts "],
+  ])("preserves the preview target for %s in workspace %s", (href, cwd, workspaceRelativePath) => {
+    expect(resolveMarkdownFileLinkMeta(href, cwd)).toMatchObject({ workspaceRelativePath });
+  });
+
+  it("keeps an encoded final space in the absolute target", () => {
+    expect(resolveMarkdownFileLinkTarget("/tmp/repo/file.ts%20", "/tmp/repo")).toBe(
+      "/tmp/repo/file.ts ",
+    );
+  });
+
   it("normalizes slash-prefixed windows drive paths before resolving", () => {
     expect(
       resolveMarkdownFileLinkTarget(

packages/client-runtime/src/markdownLinks.test.ts

@@ -160,7 +160,17 @@ describe("workspaceRelativeFilePath", () => {
     ["/repo/project/src/main.ts", "/repo/project/", "src/main.ts"],
     ["C:\\Users\\mike\\t3code\\apps\\web\\a.ts", "C:/Users/mike/t3code", "apps/web/a.ts"],
     ["/C:/Users/mike/t3code/apps/web/a.ts", "C:/Users/mike/t3code", "apps/web/a.ts"],
-    ["/Repo/Project/src/main.ts", "/repo/project", "src/main.ts"],
+    ["/Repo/Project/src/main.ts", "/repo/project", null],
+    ["/tmp/case/project/probe.txt", "/tmp/case/Project", null],
+    ["//tmp/case/project/probe.txt", "//tmp/case/Project", null],
+    ["/tmp/case/Project/probe.txt", "/tmp/case/Project", "probe.txt"],
+    ["C:/USERS/mike/t3code/main.ts", "c:/users/MIKE/t3code", "main.ts"],
+    ["/C:/USERS/mike/t3code/main.ts", "/c:/users/MIKE/t3code", "main.ts"],
+    ["\\\\server\\share\\PROJECT\\main.ts", "\\\\Server\\Share\\Project", "main.ts"],
+    ["/tmp/repo/file.ts", "/", "tmp/repo/file.ts"],
+    ["C:/Users/MIKE/main.ts", "c:/", "Users/MIKE/main.ts"],
+    ["\\\\server\\SHARE\\file.ts", "\\\\Server\\Share\\", "file.ts"],
+    ["/tmp/repo/file.ts ", "/tmp/repo", "file.ts "],
     ["/tmp/report.ts", "/repo/project", null],
     ["/repo/project-two/a.ts", "/repo/project", null],
     ["/repo/project/a.ts", undefined, null],

packages/client-runtime/src/markdownLinks.ts

@@ -342,6 +342,9 @@ export function workspaceRelativeFilePath(
   const normalizedRoot = stripSlashPrefixedWindowsDrive(
     workspaceRoot.replaceAll("\\", "/"),
   ).replace(/\/+$/, "");
-  if (!normalizedPath.toLowerCase().startsWith(`${normalizedRoot.toLowerCase()}/`)) return null;
+  const caseInsensitive = isWindowsAbsolutePath(stripSlashPrefixedWindowsDrive(workspaceRoot));
+  const pathForCompare = caseInsensitive ? normalizedPath.toLowerCase() : normalizedPath;
+  const rootForCompare = caseInsensitive ? normalizedRoot.toLowerCase() : normalizedRoot;
+  if (!pathForCompare.startsWith(`${rootForCompare}/`)) return null;
   return normalizedPath.slice(normalizedRoot.length + 1);
 }