initial commit

.gitignore

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+/old
+/result
+/init.nix

README.md

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+# Swatch
+Swatch Internet Time
+
+## Requirements
+* `getopts`
+* `gawk`
+
+## Usage
+`swatch` returns current swatch beats in format @XXX.YYY
+`swatch -s` returns in format @XXX
+`swatch -h` displays help
+
+## Installation
+`swatch.sh` contains the script, and can be added to your path.
+
+### Nix Flake
+
+`flake.nix` and `flake.lock` define a working nix flake for installing the script.
+
+## Author
+Shaun Kerr - [s@p7.co.nz](mailto:s@p7.co.nz)

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1601475821,
+        "narHash": "sha256-7AI8j/xq5slauMGwC3Dp2K9TKDyDtBXBebeyWsE9euE=",
+        "owner": "Nixos",
+        "repo": "nixpkgs",
+        "rev": "b4db68ff563895eea6aab4ff24fa04ef403dfe14",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Nixos",
+        "ref": "nixos-20.03",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "swatch beat internet time";
+  inputs.nixpkgs.url = github:Nixos/nixpkgs/nixos-20.03;
+  outputs = { self, nixpkgs }: {
+    defaultPackage.x86_64-linux =
+      with import nixpkgs { system = "x86_64-linux"; };
+      stdenv.mkDerivation rec {
+        name = "swatch-${version}";
+        version = "1.0.0";
+        meta = {
+          description = "Display the current swatch beats";
+          longDescription = ''
+            Prints the current Swatch Internet Time.
+            Optional short form.
+          '';
+          homepage = https://github.com/techieAgnostic/swatch;
+          maintainers = [ "Shaun Kerr - s@p7.co.nz" ];
+          platforms = stdenv.lib.platforms.all;
+        };
+        src = self;
+        buildInputs = [
+          gawk
+          utillinux
+        ];
+        buildPhase = "cp ./swatch.sh ./swatch";
+        installPhase = "mkdir -p $out/bin; install -t $out/bin swatch";
+      };
+  };
+}

swatch.sh

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+#!/bin/bash
+
+##
+# Displays the current Swatch Internet Time
+# 
+# -shaun kerr.
+##
+
+set -e
+
+function usage {
+   cat <<EOF
+Usage: $0 [-s -h]
+
+Displays the current Swatch Internet Time
+
+-s |   Do not display fractions
+-h |   Show help
+EOF
+}
+
+while getopts "sh" o; do
+   case $o in
+      s) fmt="@%03d\n" ;;
+      h) usage; exit 0 ;;
+      *) usage; exit 1 ;;
+   esac
+done
+
+seconds=$(date -u +"%-S")
+minutes=$(date -u +"%-M")
+hours=$((($(date -u +"%-H")+1)%24))
+if [ -z $fmt ]; then fmt="@%07.3f\n"; fi
+
+awk -v b="$((seconds + minutes*60 + hours*3600 ))" \
+    -v fmt="$fmt" \
+    'BEGIN { printf(fmt,b/86.4); }'