ctpv: fix img previews and correct dependency

Add missing pdf preview dependency. `ctpv` uses `pdftoppm` [1] to
preview pdf files. Required dependency was not included on the last PR
targeting `ctpv`, although it added the tools for other ftypes [2].

Fix chafa image privews by passing the missing flag via a patch. This
comes from a year long bug fix PR open at upstream, for details refer
there [3].

[1]: 4efa0f976e/README.md (L58)
[2]: github:NixOS/nixpkgs#223487
[3]: github:NikitaIvanovV/ctpv#90

pkgs/by-name/ct/ctpv/package.nix

@@ -15,6 +15,7 @@
   glow,
   imagemagick,
   jq,
+  poppler-utils,
   ueberzug,
 }:
 
@@ -52,11 +53,15 @@ stdenv.mkDerivation rec {
           glow # for markdown files
           imagemagick
           jq # for json files
+          poppler-utils # for pdf files
           ueberzug # for image files on X11
         ]
       }";
   '';
 
+  # Until https://github.com/NikitaIvanovV/ctpv/pull/90 is merged
+  patches = [ ./use-polite-flag.patch ];
+
   meta = with lib; {
     description = "File previewer for a terminal";
     homepage = "https://github.com/NikitaIvanovV/ctpv";

pkgs/by-name/ct/ctpv/use-polite-flag.patch

@@ -0,0 +1,13 @@
+diff --git a/sh/helpers.sh b/sh/helpers.sh
+index fef8691..229d38f 100644
+--- a/sh/helpers.sh
++++ b/sh/helpers.sh
+@@ -73,7 +73,7 @@ is_anim_image() {
+ chafa_run() {
+ 	format='-f symbols'
+ 	autochafa && format=
+-	chafasixel && format='-f sixels'
++	chafasixel && format='-f sixels --polite on'
+ 	chafa -s "${w}x${h}" $format "$1" | sed 's/#/\n#/g'
+ }
+