From a4637e2bb15a86bd96faaf75914dc8d0dfcc6294 Mon Sep 17 00:00:00 2001
From: lassulus <lassulus@lassul.us>
Date: Sun, 27 Nov 2022 21:51:15 +0100
Subject: l: allow piping into sxiv

---
 lass/2configs/baseX.nix     |  4 +---
 lass/5pkgs/sxiv/default.nix | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+), 3 deletions(-)
 create mode 100644 lass/5pkgs/sxiv/default.nix

diff --git a/lass/2configs/baseX.nix b/lass/2configs/baseX.nix
index 9b2b58f2..efd6c8a2 100644
--- a/lass/2configs/baseX.nix
+++ b/lass/2configs/baseX.nix
@@ -79,9 +79,7 @@ in {
     powertop
     rxvt-unicode
     sshvnc
-    (pkgs.writers.writeDashBin "sxiv" ''
-      ${pkgs.nsxiv}/bin/nsxiv "$@"
-    '')
+    sxiv
     nsxiv
     taskwarrior
     termite
diff --git a/lass/5pkgs/sxiv/default.nix b/lass/5pkgs/sxiv/default.nix
new file mode 100644
index 00000000..04fc1c3f
--- /dev/null
+++ b/lass/5pkgs/sxiv/default.nix
@@ -0,0 +1,27 @@
+{ nsxiv, writers }:
+
+writers.writeDashBin "sxiv" ''
+  set -efu
+  tmpfile="''${TMPDIR:-/tmp}/nsxiv_pipe_$$"
+  trap 'rm -f -- $tmpfile' EXIT
+
+  if [ "$#" -eq 0 ]; then
+    if [ -t 0 ]; then
+      echo "sxiv: No arguments provided" >&2; exit 1
+    else
+      # Consume stdin and put it in the temporal file
+      cat > "$tmpfile"
+    fi
+  fi
+
+  for arg in "$@"; do
+    # if it's a pipe then drain it to $tmpfile
+    [ -p "$arg" ] && cat "$arg" > "$tmpfile"
+  done
+
+  if [ -s "$tmpfile" ]; then
+    ${nsxiv}/bin/nsxiv -q "$@" "$tmpfile" # -q to silence warnings
+  else
+    ${nsxiv}/bin/nsxiv "$@" # fallback
+  fi
+''
-- 
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