From 452f6465e412ff21f196206e825ebb0e77a41a19 Mon Sep 17 00:00:00 2001
From: Ruairidh MacLeod <ruairidh@rkm.dev>
Date: Mon, 9 Dec 2024 10:58:24 +0000
Subject: [PATCH] add julia example

---
 julia/Dockerfile              | 14 ++++++++++++++
 julia/README.md               |  7 +++++++
 julia/src/install_packages.jl |  4 ++++
 julia/src/plot_example.jl     |  9 +++++++++
 julia/src/run_test.sh         |  7 +++++++
 5 files changed, 41 insertions(+)
 create mode 100644 julia/Dockerfile
 create mode 100644 julia/README.md
 create mode 100644 julia/src/install_packages.jl
 create mode 100644 julia/src/plot_example.jl
 create mode 100644 julia/src/run_test.sh

diff --git a/julia/Dockerfile b/julia/Dockerfile
new file mode 100644
index 0000000..52f646c
--- /dev/null
+++ b/julia/Dockerfile
@@ -0,0 +1,14 @@
+FROM docker.io/julia:latest@sha256:32b91d5ff59276c5986b9b35b76b232651d71e8273dcf22ead1593a960ce816e
+
+ENV JULIA_DEPOT_PATH=/home/ces-user/.julia
+
+USER root
+RUN mkdir /safe_data /safe_outputs /scratch
+
+WORKDIR /app
+
+COPY --chmod=0755 src/* .
+
+RUN julia /app/install_packages.jl
+
+ENTRYPOINT ["/app/run_test.sh"]
diff --git a/julia/README.md b/julia/README.md
new file mode 100644
index 0000000..89e5b2e
--- /dev/null
+++ b/julia/README.md
@@ -0,0 +1,7 @@
+# TRE Julia example
+
+## Notes
+
+This example is structured as a script `plot_example.jl` that generates a plot, and a bash script `run_test.sh` that executes the plot script and saves the output to `/safe_outputs`. Both files are found under the `src` directory, which is copied inside the container in the `Dockerfile`.
+
+The required packages are installed using the `install_packages.jl` script. Note that it is important to set the `ENV JULIA_DEPOT_PATH` to ensure the packages are installed in the same environment as where the scripts are to be executed.
diff --git a/julia/src/install_packages.jl b/julia/src/install_packages.jl
new file mode 100644
index 0000000..e76886d
--- /dev/null
+++ b/julia/src/install_packages.jl
@@ -0,0 +1,4 @@
+using Pkg
+
+Pkg.add(["GR", "Plots"])
+Pkg.precompile()
diff --git a/julia/src/plot_example.jl b/julia/src/plot_example.jl
new file mode 100644
index 0000000..4fd60b2
--- /dev/null
+++ b/julia/src/plot_example.jl
@@ -0,0 +1,9 @@
+using Plots
+
+# plot some data
+plot([cumsum(rand(500) .- 0.5), cumsum(rand(500) .- 0.5)])
+
+# save the current figure
+savefig("plots.svg")
+# .eps, .pdf, & .png are also supported
+# we used svg here because it respects the width and height specified above
diff --git a/julia/src/run_test.sh b/julia/src/run_test.sh
new file mode 100644
index 0000000..5095f86
--- /dev/null
+++ b/julia/src/run_test.sh
@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# Run example script
+julia plot_example.jl
+
+# Copy output to /safe_outputs
+mv *.svg /safe_outputs