Add qrencode function

* this uses the tool qrencode to generate a qr code png for a url

Author: slimslenderslacks

functions/hub/qrencode/Dockerfile

@@ -0,0 +1,33 @@
+
+# syntax = docker/dockerfile:1.4
+FROM nixos/nix:2.21.1@sha256:3f6c77ee4d2c82e472e64e6cd7087241dc391421a0b42c22e6849c586d5398d9 AS builder
+
+WORKDIR /tmp/build
+RUN mkdir /tmp/nix-store-closure
+
+# ignore SC2046 because the output of nix-store -qR will never have spaces - this is safe here
+# hadolint ignore=SC2046
+RUN --mount=type=cache,target=/nix,from=nixos/nix:2.21.1,source=/nix \
+    --mount=type=cache,target=/root/.cache \
+    --mount=type=bind,target=/tmp/build \
+    <<EOF
+  nix \
+    --extra-experimental-features "nix-command flakes" \
+    --option filter-syscalls false \
+    --extra-trusted-substituters "https://cache.iog.io" \
+    --extra-trusted-public-keys "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" \
+    --show-trace \
+    --log-format raw \
+    build . --out-link /tmp/output/result
+  cp -R $(nix-store -qR /tmp/output/result) /tmp/nix-store-closure
+EOF
+
+FROM scratch
+
+WORKDIR /app
+
+COPY --from=builder /tmp/nix-store-closure /nix/store
+COPY --from=builder /tmp/output/ /app/
+
+ENTRYPOINT ["/app/result/bin/entrypoint"]
+CMD ["--help"]

functions/hub/qrencode/flake.lock

@@ -0,0 +1,39 @@
+{
+  description = "fasttext";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ...}@inputs:
+
+    flake-utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = import nixpkgs {
+            inherit system;
+          };
+
+        in rec
+        {
+          packages = rec {
+
+            # this derivation just contains the init.clj script
+            scripts = pkgs.stdenv.mkDerivation {
+              name = "scripts";
+              src = ./.;
+              installPhase = ''
+                cp init.clj $out
+              '';
+            };
+
+            # the script must have gh in the PATH
+            default = pkgs.writeShellScriptBin "entrypoint" ''
+              export PATH=${pkgs.lib.makeBinPath [pkgs.qrencode]}
+              export SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt
+              ${pkgs.babashka}/bin/bb ${scripts} "$@"
+            '';
+          };
+        });
+}

functions/hub/qrencode/flake.nix

@@ -0,0 +1,19 @@
+(ns init
+  (:require
+   [babashka.process]
+   [cheshire.core]))
+
+(try
+  (let [[json-string & args] *command-line-args*
+        {:keys [url filename]} (cheshire.core/parse-string json-string true)]
+    (println
+     (-> (apply babashka.process/process
+          {:out :string}
+          ["qrencode" "-o" (format "/project/%s" filename) url])
+         (deref)
+         (babashka.process/check)
+         :out)))
+  (catch Throwable t
+    (binding [*out* *err*]
+      (println (str "Error: " (.getMessage t)))
+      (System/exit 1))))

functions/hub/qrencode/init.clj

@@ -0,0 +1,39 @@
+# Background
+
+The `qrencode` function has one parameter.
+
+* `args`: the args to send to the image
+
+## Usage
+
+This function should be given a rw bind mount for the root of a project.
+
+```sh
+docker run --rm \
+       --mount type=bind,source=$PWD,target=/project \
+       --entrypoint /app/result/bin/entrypoint \
+       --workdir /project \
+       vonwig/qrencode:latest '{"args": "-o /project/crap.png https://github.com/docker/labs-ai-tools-for-devs"}'
+```
+
+```sh
+open crap.png
+```
+
+## Build
+
+```sh
+docker build -t vonwig/qrencode:latest .
+```
+
+```sh
+# docker:command=build
+
+docker buildx build \
+    --builder hydrobuild \
+    --platform linux/amd64,linux/arm64 \
+    --tag vonwig/qrencode:latest \
+    --file Dockerfile \
+    --push .
+docker pull vonwig/qrencode:latest
+```

functions/hub/qrencode/runbook.md

@@ -0,0 +1,2 @@
+Generate a QR code for the url 
+https://github.com/docker/labs-ai-tools-for-devs.

prompts/qrencode/100_user_prompts.md

@@ -0,0 +1,18 @@
+---
+tool_choice: auto
+functions:
+  - name: qrencode
+    description: "Generate a QR code for a URL"
+    parameters:
+      type: object
+      properties:
+        url:
+          description: "The URL to encode"
+          type: string
+        filename:
+          type: string
+          description: "The name of the PNG file to write"
+    container:
+      image: vonwig/qrencode:latest
+---
+

prompts/qrencode/README.md

@@ -1,25 +1,8 @@
 ---
-extractors:
-tool_choice: auto
 model: llama3.1
 url: http://localhost:11434/v1/chat/completions
 stream: false
 functions:
   - name: docker_scout_tag_recommendation
 ---
 
-# How to Run
-
-```sh
-# docker:command=recommended-tags
-bb -m prompts run \
-              --host-dir /Users/slim/docker/labs-make-runbook \
-              --user jimclark106 \
-              --platform darwin \
-              --prompts-dir prompts/recommended_tags \
-              --nostream
-```
-
-```clj
-(core.println "hey")
-```