1 files changed, 48 insertions, 1 deletions

diff --git a/src/look.zig b/src/look.zig
index 9df2b485..4a8cb894 100644
--- a/src/look.zig
+++ b/src/look.zig
@@ -16,6 +16,7 @@ const builtin = @import("builtin");
 const libc = std.c;
 const pardes = @import("pardes.zig");
 const config = @import("config.zig");
+const pdf_enabled = @import("pardes_config").mupdf;
 const embedded_sources = if (pardes.platform == .web) @import("embedded_sources") else struct {
     pub const Source = struct { path: []const u8, contents: []const u8 };
     pub const all = [_]Source{};
@@ -164,10 +165,21 @@ test "parsePathLine: spots, ranges, and the paths that merely look like them" {
     }
 }
 
+/// A file-like Look target has a rendering kind only in MuPDF builds. The
+/// feature-off enum has no `pdf` tag at all, so `.pdf` is indistinguishable
+/// from any other ordinary file before it reaches the core.
+pub const FileKind = if (pdf_enabled) enum { text, pdf } else enum { text };
+
+pub const FileTarget = struct {
+    path: []const u8,
+    at: Spot,
+    kind: FileKind = .text,
+};
+
 pub const Target = union(enum) {
     none,
     dir: []const u8, // resolved absolute path, in caller's buf
-    file: struct { path: []const u8, at: Spot },
+    file: FileTarget,
     image: struct { path: []const u8 },
     url: []const u8,
     /// `@p7:10:5` — pane 7, line 10, column 5 (0 = unspecified). The one
@@ -183,6 +195,36 @@ pub fn isImagePath(path: []const u8) bool {
     return false;
 }
 
+pub fn isPdfPath(path: []const u8) bool {
+    if (comptime !pdf_enabled) return false;
+    return std.ascii.endsWithIgnoreCase(path, ".pdf");
+}
+
+test "PDF file kinds exist only in MuPDF-enabled builds" {
+    try std.testing.expectEqual(pdf_enabled, isPdfPath("manual.PDF"));
+    try std.testing.expect(!isPdfPath("manual.pdf.txt"));
+    try std.testing.expectEqual(
+        pdf_enabled,
+        std.meta.stringToEnum(FileKind, "pdf") != null,
+    );
+    try std.testing.expect(std.meta.stringToEnum(std.meta.Tag(Target), "pdf") == null);
+}
+
+test ".pdf Look paths are ordinary files when MuPDF is disabled" {
+    if (!platform_has_fs) return;
+    var realbuf: [4096]u8 = undefined;
+    const target = resolve("docs/design.pdf", ".", &realbuf);
+    switch (target) {
+        .file => |file| {
+            if (comptime pdf_enabled)
+                try std.testing.expectEqual(FileKind.pdf, file.kind)
+            else
+                try std.testing.expectEqual(FileKind.text, file.kind);
+        },
+        else => return error.PdfDidNotResolveAsFile,
+    }
+}
+
 /// Resolve a looked-at word against the pane's directory. `realbuf` must
 /// outlive the returned Target (native paths point into it; web paths are
 /// process-lifetime slices in the embedded source archive).
@@ -217,6 +259,11 @@ pub fn resolve(word_raw: []const u8, cwd: []const u8, realbuf: *[4096]u8) Target
         const rp = realpath(jz.ptr, realbuf) orelse return .none;
         const resolved = std.mem.span(rp);
         if (isDir(rp)) return .{ .dir = resolved };
+        if (comptime pdf_enabled) if (isPdfPath(resolved)) return .{ .file = .{
+            .path = resolved,
+            .at = pl.at,
+            .kind = .pdf,
+        } };
         if (isImagePath(resolved)) return .{ .image = .{ .path = resolved } };
         return .{ .file = .{ .path = resolved, .at = pl.at } };
     } else {