From da8759bb419b453a88df9f16c3d9e08d22965e90 Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <sergei@zimmerman.foo>
Date: Sun, 17 Aug 2025 20:31:34 +0300
Subject: [PATCH 1/2] libcmd: Fix rendering of absolute URLs in markdown

lowdown >= 1.4.0 supports LOWDOWN_TERM_NORELLINK to render
absolute urls. This is useful, since we want to keep links to
web resources and such intact.
---
 src/libcmd/markdown.cc | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/libcmd/markdown.cc b/src/libcmd/markdown.cc
index 09cd9c1fb..c3341da73 100644
--- a/src/libcmd/markdown.cc
+++ b/src/libcmd/markdown.cc
@@ -37,9 +37,17 @@ static std::string doRenderMarkdownToTerminal(std::string_view markdown)
         .vmargin = 0,
 #  endif
         .feat = LOWDOWN_COMMONMARK | LOWDOWN_FENCED | LOWDOWN_DEFLIST | LOWDOWN_TABLES,
-        .oflags = LOWDOWN_TERM_NOLINK,
+        .oflags =
+#  if HAVE_LOWDOWN_1_4
+            LOWDOWN_TERM_NORELLINK // To render full links while skipping relative ones
+#  else
+            LOWDOWN_TERM_NOLINK
+#  endif
     };
 
+    if (!isTTY())
+        opts.oflags |= LOWDOWN_TERM_NOANSI;
+
     auto doc = lowdown_doc_new(&opts);
     if (!doc)
         throw Error("cannot allocate Markdown document");
@@ -65,7 +73,7 @@ static std::string doRenderMarkdownToTerminal(std::string_view markdown)
     if (!rndr_res)
         throw Error("allocation error while rendering Markdown");
 
-    return filterANSIEscapes(std::string(buf->data, buf->size), !isTTY());
+    return std::string(buf->data, buf->size);
 }
 
 std::string renderMarkdownToTerminal(std::string_view markdown)

From 3ffeed497a8401a18ea6f222afde5c7024749d15 Mon Sep 17 00:00:00 2001
From: Sergei Zimmerman <sergei@zimmerman.foo>
Date: Sun, 17 Aug 2025 20:49:50 +0300
Subject: [PATCH 2/2] packaging: Update lowdown to 2.0.2

Nixpkgs has been updated with this version and seems
like next stable nixos release will ship with lowdown 2.0.
---
 packaging/dependencies.nix | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/packaging/dependencies.nix b/packaging/dependencies.nix
index 17ba06b4d..5f1dc55e6 100644
--- a/packaging/dependencies.nix
+++ b/packaging/dependencies.nix
@@ -64,6 +64,18 @@ scope: {
         NIX_CFLAGS_COMPILE = "-DINITIAL_MARK_STACK_SIZE=1048576";
       });
 
+  lowdown = pkgs.lowdown.overrideAttrs (prevAttrs: rec {
+    version = "2.0.2";
+    src = pkgs.fetchurl {
+      url = "https://kristaps.bsd.lv/lowdown/snapshots/lowdown-${version}.tar.gz";
+      hash = "sha512-cfzhuF4EnGmLJf5EGSIbWqJItY3npbRSALm+GarZ7SMU7Hr1xw0gtBFMpOdi5PBar4TgtvbnG4oRPh+COINGlA==";
+    };
+    nativeBuildInputs = prevAttrs.nativeBuildInputs ++ [ pkgs.bmake ];
+    postInstall =
+      lib.replaceStrings [ "lowdown.so.1" "lowdown.1.dylib" ] [ "lowdown.so.2" "lowdown.2.dylib" ]
+        prevAttrs.postInstall;
+  });
+
   # TODO Hack until https://github.com/NixOS/nixpkgs/issues/45462 is fixed.
   boost =
     (pkgs.boost.override {