add screenshot to an image viewer

bin/screenshot.nix

@@ -10,9 +10,10 @@ full screen (copy)
 a selected area
 current window
 full screen
+viewer
 """
 
-cmd = '${pkgs.rofi-wayland}/bin/rofi -dmenu -location 2 -l 6 -i -p "Screenshot which area?"'
+cmd = '${pkgs.rofi-wayland}/bin/rofi -dmenu -location 2 -l 7 -i -p "Screenshot which area?"'
 result = subprocess.run(cmd,
                         input=options,
                         stdout=subprocess.PIPE,
@@ -25,6 +26,10 @@ if result.returncode != 0:
 
 choice = result.stdout.strip()
 cmd = "${pkgs.pkgs.sway-contrib.grimshot}/bin/grimshot "
+if choice == "viewer":
+    filename = subprocess.getoutput("mktemp")
+    cmd += f"save area {filename}"
+else:
     cmd += "copy " if re.match(".*(copy)", choice) else "save "
 
 for k, v in {"a selected area.*": "area ",
@@ -36,4 +41,7 @@ for k, v in {"a selected area.*": "area ",
 
 subprocess.call(cmd,
                 shell=True)
+
+if choice == "viewer":
+    subprocess.run(f"nsxiv -b {filename}", shell=True)
 ''

fish.nix

@@ -110,6 +110,7 @@
       pull = "git pull";
       m = "meson";
       n = "ninja";
+      gdb_asan = "gdb -tui -ex='break __asan::ReportGenericError'";
     };
 
     plugins = [