From 0e3a73a20ebb58f52468e3bc7bb4dc14c334840d Mon Sep 17 00:00:00 2001
From: Luis Eduardo Bueso de Barrio <luiseduardobueso96@gmail.com>
Date: Fri, 6 Mar 2026 15:17:45 +0100
Subject: [PATCH] texlab-patched

---
 .gitignore                                    |  1 +
 devshells/default.nix                         |  2 +-
 flake.nix                                     |  9 ++++-
 pkgs/default.nix                              |  8 ++++-
 pkgs/texlab/default.nix                       | 24 +++++++++++++
 pkgs/texlab/patches/subfile-diagnostics.patch | 36 +++++++++++++++++++
 6 files changed, 77 insertions(+), 3 deletions(-)
 create mode 100644 pkgs/texlab/default.nix
 create mode 100644 pkgs/texlab/patches/subfile-diagnostics.patch

diff --git a/.gitignore b/.gitignore
index 3b21f02..bfbc55e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@ result
 result-*
 .direnv
 /.envrc
+/.agent-shell/
diff --git a/devshells/default.nix b/devshells/default.nix
index 6edfd36..f3e0227 100644
--- a/devshells/default.nix
+++ b/devshells/default.nix
@@ -1,4 +1,3 @@
-
 {
   pkgs,
   system,
@@ -12,6 +11,7 @@ pkgs.mkShell {
       nixfmt-rfc-style
       nil
       nix-tree
+      nix
       (jailed-agents.lib.${system}.makeJailed system {
         agentTool = "opencode";
         extraPkgs =
diff --git a/flake.nix b/flake.nix
index 1fc8dd7..19b353f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,6 +15,10 @@
     flake-utils.url = "github:numtide/flake-utils";
     jailed-agents.url = "git+https://gitea@gitea.bueso.eu/luis/jailed-agents";
     mcp-servers.url = "git+https://gitea@gitea.bueso.eu/luis/mcp-servers";
+    texlab-src = {
+      url = "github:latex-lsp/texlab/v5.25.1";
+      flake = false;
+    };
   };
 
   outputs =
@@ -24,6 +28,7 @@
       flake-utils,
       jailed-agents,
       mcp-servers,
+      texlab-src,
     }:
     flake-utils.lib.eachDefaultSystem (
       system:
@@ -31,7 +36,9 @@
         pkgs = nixpkgs.legacyPackages.${system};
       in
       {
-        packages = import ./pkgs { inherit pkgs; };
+        packages = import ./pkgs {
+          inherit pkgs texlab-src;
+        };
 
         devShells.default = import ./devshells {
           inherit pkgs system;
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 3fef26e..5616cfb 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -1,4 +1,7 @@
-{ pkgs }:
+{
+  pkgs,
+  texlab-src,
+}:
 let
   self = {
     example-a = pkgs.callPackage ./example-a { };
@@ -9,6 +12,9 @@ let
     };
     khal-export = pkgs.callPackage ./khal-export { };
     org-zotero-export = pkgs.callPackage ./org-zotero-export { };
+    texlab = pkgs.callPackage ./texlab {
+      inherit texlab-src;
+    };
   };
 in
 self // { default = self.example-a; }
diff --git a/pkgs/texlab/default.nix b/pkgs/texlab/default.nix
new file mode 100644
index 0000000..f8f8671
--- /dev/null
+++ b/pkgs/texlab/default.nix
@@ -0,0 +1,24 @@
+{
+  lib,
+  rustPlatform,
+  pkg-config,
+  openssl,
+  texlab-src,
+}:
+rustPlatform.buildRustPackage {
+  pname = "texlab";
+  version = "5.25.1-patched";
+  src = texlab-src;
+  cargoLock.lockFile = "${texlab-src}/Cargo.lock";
+  patches = [ ./patches/subfile-diagnostics.patch ];
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ openssl ];
+
+  meta = {
+    description = "Texlab with subfile diagnostic fix";
+    mainProgram = "texlab";
+    license = lib.licenses.mit;
+    platforms = lib.platforms.all;
+  };
+}
diff --git a/pkgs/texlab/patches/subfile-diagnostics.patch b/pkgs/texlab/patches/subfile-diagnostics.patch
new file mode 100644
index 0000000..3277f29
--- /dev/null
+++ b/pkgs/texlab/patches/subfile-diagnostics.patch
@@ -0,0 +1,36 @@
+diff --git a/crates/diagnostics/src/build_log.rs b/crates/diagnostics/src/build_log.rs
+index 1234567..abcdefg 100644
+--- a/crates/diagnostics/src/build_log.rs
++++ b/crates/diagnostics/src/build_log.rs
+@@ -14,8 +14,13 @@ pub fn update(
+ 
+     let data = log_document.data.as_log()?;
+ 
+-    let parents = deps::parents(workspace, log_document);
+-    let root_document = parents.iter().next()?;
++    // Try to find the compiled .tex file from the log file name first.
++    // This handles subfile compilation where the subfile is the actual root.
++    let root_document = find_compiled_document(workspace, log_document)
++        .or_else(|| {
++            // Fallback to original behavior: find parent via dependency graph
++            deps::parents(workspace, log_document).into_iter().next()
++        })?;
+ 
+     let base_path = root_document
+         .path
+@@ -57,3 +62,14 @@ fn find_range_of_hint(document: &Document, error: &BuildError) -> Option<TextRan
+     let hint_end = hint_start + hint.text_len();
+     Some(TextRange::new(hint_start, hint_end))
+ }
++
++/// Given a .log file, find the corresponding .tex file that was compiled.
++/// E.g., `/path/to/chapter.log` -> `/path/to/chapter.tex`
++fn find_compiled_document<'a>(
++    workspace: &'a Workspace,
++    log_document: &Document,
++) -> Option<&'a Document> {
++    let log_path = log_document.path.as_ref()?;
++    let tex_path = log_path.with_extension("tex");
++    let tex_uri = Url::from_file_path(&tex_path).ok()?;
++    workspace.lookup(&tex_uri)
++}