rename `tools` to `packages` to follow convention

The convention is to use `pkgs` or `packages` for overlays and
definition of custom packages. Since I'm already using `pkg` for go,
I prefer to use `packages` for my scripts.

2 files changed, 55 insertions, 0 deletions

diff --git a/packages/seqstat/default.nix b/packages/seqstat/default.nix
new file mode 100644
index 0000000..96cbd40
--- /dev/null
+++ b/packages/seqstat/default.nix
@@ -0,0 +1,25 @@
+{ lib, python3, stdenvNoCC }:
+
+stdenvNoCC.mkDerivation rec {
+  pname = "seqstat";
+  src = ./seqstat.py;
+  version = "0.1.0";
+
+  buildInputs = [ python3 ];
+  propagatedBuildInputs = [ python3 ];
+
+  dontUnpack = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp $src $out/bin/${pname}
+  '';
+
+  meta = with lib; {
+    description = "Display an histogram for a given sequence of numbers.";
+    license = with licenses; [ mit ];
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ fcuny ];
+  };
+}
diff --git a/packages/seqstat/seqstat.py b/packages/seqstat/seqstat.py
new file mode 100755
index 0000000..55b6ecc
--- /dev/null
+++ b/packages/seqstat/seqstat.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+import argparse
+
+ticks = ["▁", "▂", "▃", "▄", "▅", "▆", "▇", "█"]
+
+
+def histogram(sequence):
+    min_val = min(sequence)
+    max_val = max(sequence)
+
+    scale = (int(max_val - min_val) << 8) / (len(ticks) - 1)
+    if scale < 1:
+        scale = 1
+
+    return [ticks[int((int(i - min_val) << 8) / scale)] for i in sequence]
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "numbers",
+        metavar="N",
+        type=float,
+        nargs="+",
+        help="a number for the accumulator",
+    )
+    args = parser.parse_args()
+    h = histogram(args.numbers)
+    print("".join(h))