From d26ca8bc668cf91169b5b2e8abc8734524309243 Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Sun, 8 Dec 2019 22:59:45 -0500
Subject: [PATCH 1/2] texlive.bin.dvisvgm: fix for our ghostscript

---
 pkgs/tools/typesetting/tex/texlive/bin.nix       | 15 +++++++++++++++
 .../typesetting/tex/texlive/dvisvgm-fix.patch    | 16 ++++++++++++++++
 2 files changed, 31 insertions(+)
 create mode 100644 pkgs/tools/typesetting/tex/texlive/dvisvgm-fix.patch

diff --git a/pkgs/tools/typesetting/tex/texlive/bin.nix b/pkgs/tools/typesetting/tex/texlive/bin.nix
index 8fb155da755..6716b463fa9 100644
--- a/pkgs/tools/typesetting/tex/texlive/bin.nix
+++ b/pkgs/tools/typesetting/tex/texlive/bin.nix
@@ -261,6 +261,21 @@ dvisvgm = stdenv.mkDerivation {
 
   inherit (common) src;
 
+  patches = [
+    # Fix for ghostscript>=9.27
+    # Backport of
+    # https://github.com/mgieseki/dvisvgm/commit/bc51951bc90b700c28ea018993bdb058e5271e9b
+    ./dvisvgm-fix.patch
+
+    # Needed for ghostscript>=9.50
+    (fetchpatch {
+      url = "https://github.com/mgieseki/dvisvgm/commit/7b93a9197b69305429183affd24fa40ee04a663a.patch";
+      sha256 = "1gmj76ja9xng39wxckhs9q140abixgb8rkrcfv2cdgq786wm3vag";
+      stripLen = 1;
+      extraPrefix = "texk/dvisvgm/dvisvgm-src/";
+    })
+  ];
+
   nativeBuildInputs = [ pkgconfig ];
   # TODO: dvisvgm still uses vendored dependencies
   buildInputs = [ core/*kpathsea*/ ghostscript zlib freetype potrace xxHash ];
diff --git a/pkgs/tools/typesetting/tex/texlive/dvisvgm-fix.patch b/pkgs/tools/typesetting/tex/texlive/dvisvgm-fix.patch
new file mode 100644
index 00000000000..0e927e24fd0
--- /dev/null
+++ b/pkgs/tools/typesetting/tex/texlive/dvisvgm-fix.patch
@@ -0,0 +1,16 @@
+diff a/texk/dvisvgm/dvisvgm-src/src/psdefs.cpp b/texk/dvisvgm/dvisvgm-src/src/psdefs.cpp
+--- a/texk/dvisvgm/dvisvgm-src/src/psdefs.cpp
++++ b/texk/dvisvgm/dvisvgm-src/src/psdefs.cpp
+@@ -107,8 +107,7 @@ const char *PSInterpreter::PSDEFS =
+ "dmode sysexec<</Normal 0/Compatible 0/Multiply 1/Screen 2/Overlay 3/SoftLight "
+ "4/HardLight 5/ColorDodge 6/ColorBurn 7/Darken 8/Lighten 9/Difference 10/Exclus"
+ "ion 11/Hue 12/Saturation 13/Color 14/Luminosity 15/CompatibleOverprint 16>>exc"
+-"h get 1(setblendmode)prcmd}def/@pdfpagecount{GS_PDF_ProcSet begin pdfdict begi"
+-"n(r)file pdfopen begin pdfpagecount currentdict pdfclose end end end}def/@pdfp"
+-"agebox{GS_PDF_ProcSet begin pdfdict begin(r)file pdfopen begin dup dup 1 lt ex"
+-"ch pdfpagecount gt or{pop}{pdfgetpage/MediaBox pget pop aload pop}ifelse curre"
+-"ntdict pdfclose end end end}def DELAYBIND{.bindnow}if ";
++"h get 1(setblendmode)prcmd}def/@pdfpagecount{(r)file runpdfbegin pdfpagecount "
++"runpdfend}def/@pdfpagebox{(r)file runpdfbegin dup dup 1 lt exch pdfpagecount g"
++"t or{pop}{pdfgetpage/MediaBox pget pop aload pop}ifelse runpdfend}def DELAYBIN"
++"D{.bindnow}if ";

From 2f637f4cff9335990f5d951fb2c81ccec71d8929 Mon Sep 17 00:00:00 2001
From: Dmitry Kalinkin <dmitry.kalinkin@gmail.com>
Date: Sun, 8 Dec 2019 23:04:03 -0500
Subject: [PATCH 2/2] texlive.bin.dvisvgm: don't provide dependencies that it
 ignores

dvisvgm currently uses its own vendored versions for multiple libraries
---
 pkgs/tools/typesetting/tex/texlive/bin.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pkgs/tools/typesetting/tex/texlive/bin.nix b/pkgs/tools/typesetting/tex/texlive/bin.nix
index 6716b463fa9..d251d55c9f5 100644
--- a/pkgs/tools/typesetting/tex/texlive/bin.nix
+++ b/pkgs/tools/typesetting/tex/texlive/bin.nix
@@ -278,7 +278,7 @@ dvisvgm = stdenv.mkDerivation {
 
   nativeBuildInputs = [ pkgconfig ];
   # TODO: dvisvgm still uses vendored dependencies
-  buildInputs = [ core/*kpathsea*/ ghostscript zlib freetype potrace xxHash ];
+  buildInputs = [ core/*kpathsea*/ ghostscript zlib freetype /*potrace xxHash*/ ];
 
   preConfigure = "cd texk/dvisvgm";