release 2.0: scala, R

2024-06-26 10:10:47 +12:00 · 2022-05-16 16:31:24 +00:00 · 2022-05-16 16:31:24 +00:00 · 22a31f0451
parent 966680a716
commit 22a31f0451
34 changed files with 1206 additions and 0 deletions
--- a/workspaces/r-workspace/Dockerfile
+++ b/workspaces/r-workspace/Dockerfile
@ -0,0 +1,50 @@
+ARG docker_registry=docker.io/alnoda
+ARG image_tag=2.0
+
+FROM ${docker_registry}/base-workspace:${image_tag}
+USER root
+
+COPY mkdocs /home/docs
+COPY docs/getting-started.md /home/docs/docs/getting-started.md
+COPY supervisord-rstudio.conf /etc/supervisord/
+
+### R
+ENV R_VERSION=4.2.0 \
+    R_HOME=/usr/local/lib/R \
+    TZ=Etc/UTC \
+    CRAN=https://packagemanager.rstudio.com/cran/__linux__/focal/latest \
+    LANG=en_US.UTF-8 \
+    S6_VERSION=v2.1.0.2 \
+    RSTUDIO_VERSION=2022.02.2+485 \
+    DEFAULT_USER=abc \
+    PANDOC_VERSION=default \
+    RSTUDIO_SERVER_HOST=0.0.0.0
+
+ENV PATH=/usr/local/bin/:$PATH
+ENV PATH=/usr/lib/rstudio-server/bin:$PATH
+
+RUN cd /tmp && git clone https://github.com/rocker-org/rocker-versioned2.git \
+    && mv /tmp/rocker-versioned2/scripts /rocker_scripts \
+    && bash /rocker_scripts/install_R_source.sh \
+    && bash /rocker_scripts/setup_R.sh \
+    && mkdir /var/log/rstudio \
+    && bash /rocker_scripts/install_rstudio.sh \
+    && rstudio-server stop || true \
+    && echo "------------------------------------------------------ user" \
+    && chown -R abc /etc/rstudio \
+    && chown -R abc /usr/lib/rstudio-server \
+    && chown -R abc /var/lib/rstudio-server \
+    && chown -R abc /var/log/rstudio \ 
+    && chown -R abc /usr/local/lib/R \
+    && mkdir /home/abc/.rserver && chown -R abc /home/abc/.rserver \
+    && find /home -type d | xargs -I{} chown -R abc {} \
+    && find /home -type f | xargs -I{} chown abc {} 
+
+USER abc
+
+COPY rstudio/database.conf /home/abc/.rserver
+ENV USER=abc
+
+RUN echo "------------------------------------------------------ some cleaning because Rstudio workdir is /home/abc/" \
+    && rm -rf /home/abc/installed-python-packages \
+    && rm -rf /home/abc/utils
--- a/workspaces/r-workspace/README.md
+++ b/workspaces/r-workspace/README.md
@ -0,0 +1,61 @@
+<p align="center">
+  <img src="https://github.com/bluxmit/alnoda-workspaces/blob/main/img/Alnoda-white.svg" alt="Alnoda logo" width="150">
+</p> 
+
+# R workspace 
+
+Docker image with R and browser-based RStudio version. 
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/codeserver-workspace/img/codeserver-collage-sm.jpg" alt="Collage" width="750">
+</p>
+
+## Why this images
+
+1. If you need self-hosted remote development environment.
+2. If you want to be one terminal command away from coding in R.
+3. if you need isolated environment where you can work with R without polluting main environment.
+
+## Start
+ 
+```
+docker run --name space-1 -d -p 8020-8035:8020-8035 alnoda/r-workspace
+```  
+
+and open [localhost:8020](http://localhost:8020) in browser.  
+
+## Features
+
+- [R](https://www.r-project.org/) 
+- RStudio server
+
+**Dev tools:**
+
+- [**Code-server**](https://github.com/cdr/code-server) - open source version of popular Visual Studio Code IDE. Codeserver has 
+VS-Code extensions and works in browser. 
+- [**Terminal**](https://github.com/tsl0922/ttyd) - secure browser-based terminal.
+- [**FileBrowser**](https://github.com/filebrowser/filebrowser)  - manage files and folders inside the workspace, and exchange data between local environment and the workspace
+- [**Cronicle**](https://github.com/jhuckaby/Cronicle)  - task scheduler and runner, with a web based front-end UI. It handles both scheduled, repeating and on-demand jobs, targeting any number of worker servers, with real-time stats and live log viewer.
+- [**Static File Server**](https://github.com/vercel/serve) - view any static html sites as easy as if you do it on your local machine. Serve static websites easily.
+- [**Ungit**](https://github.com/FredrikNoren/ungit) - rings user friendliness to git without sacrificing the versatility of it.
+- [**MkDocs**](https://squidfunk.github.io/mkdocs-material/)  - create awesome documentation for your project with only markdown. 
+- [**Midnight Commander**](https://midnight-commander.org/)  - Feature rich visual file manager with internal text viewer and editor. 
+- [**Process Monitor**](https://htop.dev/)  - Monitor running process and resource utilization. 
+- Quicklaunch UI with getting started tutorial
+
+Image is built from **Ubuntu 20.4** with the additional CLI apps
+
+- [Zsh](https://www.zsh.org/), [Oh my Zsh](https://ohmyz.sh/)
+- Python 3, Pip 
+- Node/nodeenv
+- curl, wget, telnet, jq
+- **Git:** git, git-flow, lazygit 
+- **File browsers:** mc, xplr
+- **Text editors:** nano, vim, mcedit
+- **System monitors:** ncdu, htop, glances, vizex
+- **Process Control:** supervisord
+- **Job scheduler:** cron
+
+## Docs
+See our guides on [**getting started**](docs/getting-started.md) and [**advanced features**](../ubuntu-workspace/docs/workspaces.md).
+
--- a/workspaces/r-workspace/docs/getting-started.md
+++ b/workspaces/r-workspace/docs/getting-started.md
@ -0,0 +1,69 @@
+# Getting started
+
+## Intro  
+
+To start, open Quickstart page [localhost:8020](http://localhost:8020/) for quick access to all the tools
+    
+From the quicklaunch page you can open workspace tools, such as code editor or terminal 
+
+<div align="center" style="font-style: italic;">
+    Demo: Workspace UI 
+</div>
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/ide-workspace/img/wid-ui.png" alt="wid-ui.png" width="750">
+</p>
+
+This workspace includes RStudio Server, a browser-based IDE for R.
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/r-workspace/img/RStudio.png" alt="RStudio" width="750">
+</p>
+
+Workspace has full-size browser-base terminal
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/base-workspace/img/base-workspace-terminal.gif" alt="Base-Workspace terminal" width="750">
+</p> 
+
+
+## R
+
+Open terminal, and check R version 
+
+```
+R --version
+```
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/r-workspace/img/r-version.png" alt="RStudio" width="500">
+</p>
+
+To start R shell, simply execute `R` in the terminal
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/r-workspace/img/r-shell.png" alt="RStudio" width="500">
+</p>
+
+If you want to install packages from the terminal, execute 
+
+```
+Rscript -e 'install.packages("drat", repos="https://cloud.r-project.org")'
+```
+
+
+## Examples
+
+CUse terminal to clone example repository 
+
+```
+cd /home/abc 
+git clone https://github.com/dmarcelinobr/r-code-examples.git
+```
+
+Open Rstudio, and try some examples, i.e. `2d-density-plot.r`. Evaluate code, agree to install dependencies 
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/r-workspace/img/2d-density-plot.png" alt="RStudio" width="750">
+</p>
+
--- a/workspaces/r-workspace/img/2d-density-plot.png
+++ b/workspaces/r-workspace/img/2d-density-plot.png
--- a/workspaces/r-workspace/img/RStudio.png
+++ b/workspaces/r-workspace/img/RStudio.png
--- a/workspaces/r-workspace/img/r-shell.png
+++ b/workspaces/r-workspace/img/r-shell.png
--- a/workspaces/r-workspace/img/r-version.png
+++ b/workspaces/r-workspace/img/r-version.png
--- a/workspaces/r-workspace/mkdocs/.gitignore
+++ b/workspaces/r-workspace/mkdocs/.gitignore
@ -0,0 +1,68 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+
+# Scrapy stuff:
+.scrapy
+
+# PyBuilder
+target/
+
+# IPython Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# virtualenv
+venv/
+ENV/
+
+# MkDocs documentation
+site/
--- a/workspaces/r-workspace/mkdocs/docs/README.md
+++ b/workspaces/r-workspace/mkdocs/docs/README.md
@ -0,0 +1,130 @@
+<style>
+/* These styles apply only to this page! */
+  .md-content__button {
+    display: none;
+  }
+  .md-sidebar--secondary{
+    display: none !important;
+  }
+  .md-typeset h1 {
+      line-height: 0;
+      margin: 0;
+      margin-left: -9999px;
+  }
+  .quickstart-wrapper {
+    min-width: 300px;
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: center;
+    padding-left: -50px;
+    column-gap: 50px;
+    row-gap: 50px;
+  }
+  .quickstart-wrapper > div {
+    flex: 300px;
+    max-width: 300px;
+  }
+  .tool-img{
+    box-shadow: rgba(0, 0, 0, 0.24) 0px 5px 5px;
+    border-radius: 5px;
+    min-width: 300px;
+    max-width: 300px;
+    max-height: 170px;
+    min-height: 170px;
+  }
+  .tool-caption{
+    font-family:  Roboto, Helvetica, sans-serif;
+    text-align: center;
+    margin-top: 10px;
+    font-size:  1.2rem;
+    font-weight: bold;
+
+    /* font-size: 1.25em;
+    font-weight: 400; */
+    letter-spacing: -.02em;
+    line-height: 1.5;
+  }
+  .tool-description{
+    font-family:  Helvetica, sans-serif;
+    text-align: center;
+    margin-top: 10px;
+    font-size:  0.7rem;
+    font-style: oblique;
+    /* font-weight: bold; */
+  }
+</style>
+
+
+{% 
+    set tools = [
+        {
+            "env": "IDE_URL",
+            "name": "RStudio",
+            "image": "assets/home/RStudio.png",
+            "description": "Best integrated development environment for R"
+        },
+        {
+            "env": "TERMINAL_URL",
+            "name": "Terminal",
+            "image": "assets/home/Terminal.png",
+            "description": "Full-fledged WEB-based Command Line Interface"
+        },
+        {
+            "env": "FILEBROWSER_URL",
+            "name": "File Browser",
+            "image": "assets/home/Filebrowser.png",
+            "description": "Browse, upload and download files and folders to and from the Workspace"
+        },
+        {
+            "env": "CRONICLE_URL",
+            "name": "Cronicle",
+            "image": "assets/home/Cronicle.jpg",
+            "description": "Schedule jobs, manage schedules, observe and monitor executions (user/pass - admin/admin)"
+        },
+        {
+            "env": "UNGIT_URL",
+            "name": "Ungit",
+            "image": "assets/home/Ungit.jpg",
+            "description": "Manage Git repositories and work flow using beautiful UI"
+        },
+        {
+            "env": "STATICFS_URL",
+            "name": "Static File Server",
+            "image": "assets/home/Static-server.png",
+            "description": "Serve any static websites like a breeze"
+        },
+        {
+            "env": "MC_URL",
+            "name": "M.Commander",
+            "image": "assets/home/MC.jpg",
+            "description": "Feature rich visual file manager with internal text viewer and editor" 
+        },
+        {
+            "env": "HTOP_URL",
+            "name": "Resource monitor",
+            "image": "assets/home/Htop.jpg",
+            "description": "Monitor running process and resource utilization"
+        }
+        ] 
+%}
+
+
+<div class="quickstart-wrapper">
+  {% for tool in tools %}
+    {% set tool_url = get_tool_url(tool.env) %}
+    <div>
+        <a href="{{ tool_url }}" target="_blank" rel="noopener noreferrer">
+            <img src="{{ tool.image }}" class="tool-img"/>
+        </a>
+        <a href="{{ tool_url }}">
+            <div class="tool-caption">{{ tool.name }}</div>
+        </a>
+        <div class="tool-description">{{ tool.description }}</div>
+    </div>
+  {% endfor %}
+</div>
+
+
+
+
+
--- a/workspaces/r-workspace/mkdocs/docs/assets/Alnoda-logo.svg
+++ b/workspaces/r-workspace/mkdocs/docs/assets/Alnoda-logo.svg
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+<path style="fill: rgb(191, 27, 44); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-1658.4,-1397.2)" d="M 2376.5 939.8 v -445.9 c 0 -6.1 4.6 -11.1 10.4 -11.1 c 5.7 0 10.4 5 10.4 11.1 v 445.9 c 0 6.1 -4.7 11.1 -10.4 11.1 c -5.7 0 -10.4 -5 -10.4 -11.1" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,15.4,21.9)"  >
+<path style="fill: rgb(191, 27, 44); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-1691.8,-1383.2)" d="M 2409.9 912.4 v -419.2 c 0 -5.8 4.6 -10.4 10.4 -10.4 c 5.7 0 10.4 4.7 10.4 10.4 v 419.2 c 0 5.8 -4.7 10.4 -10.4 10.4 c -5.7 0 -10.4 -4.7 -10.4 -10.4" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,95.7,12.6)"  >
+<path style="fill: rgb(64, 50, 44); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-2040,-1423.3)" d="M 2677.7 878.7 c 0 52.1 44.1 94.1 97 90.6 c 48.2 -3.2 84.6 -45.5 84.6 -93.8 V 490.5 c 0 -14.3 11.6 -25.9 25.9 -25.9 c 14.3 0 25.9 11.6 25.9 25.9 v 384 c 0 76.7 -58.8 142.8 -135.5 146.6 c -81.9 4 -149.8 -61.4 -149.8 -142.5 V 490.5 c 0 -14.3 11.6 -25.9 25.9 -25.9 c 14.3 0 25.9 11.6 25.9 25.9 v 388.2" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,80.3,21.9)"  >
+<path style="fill: rgb(128, 204, 40); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-1973.2,-1383.2)" d="M 2691.3 912.4 v -419.2 c 0 -5.8 4.7 -10.4 10.4 -10.4 c 5.7 0 10.4 4.7 10.4 10.4 v 419.2 c 0 5.8 -4.6 10.4 -10.4 10.4 c -5.7 0 -10.4 -4.7 -10.4 -10.4" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,88,18.6)"  >
+<path style="fill: rgb(128, 204, 40); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-2006.6,-1397.2)" d="M 2724.7 940.4 v -447.2 c 0 -5.8 4.7 -10.5 10.4 -10.5 c 5.7 0 10.4 4.7 10.4 10.5 v 447.2 c 0 5.8 -4.6 10.4 -10.4 10.4 c -5.7 0 -10.4 -4.7 -10.4 -10.4" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,95.7,17.5)"  >
+<path style="fill: rgb(128, 204, 40); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-2040,-1401.8)" d="M 2758.1 949.5 v -456.1 c 0 -5.9 4.6 -10.6 10.4 -10.6 c 5.7 0 10.4 4.8 10.4 10.6 v 456.1 c 0 5.9 -4.6 10.7 -10.4 10.7 c -5.7 0 -10.4 -4.8 -10.4 -10.7" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,103.4,18.6)"  >
+<path style="fill: rgb(128, 204, 40); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-2073.4,-1397.2)" d="M 2791.5 939.8 v -445.9 c 0 -6.1 4.6 -11.1 10.4 -11.1 c 5.7 0 10.4 5 10.4 11.1 v 445.9 c 0 6.1 -4.7 11.1 -10.4 11.1 c -5.7 0 -10.4 -5 -10.4 -11.1" stroke-linecap="round" />
+</g>
+		<g transform="matrix(0.2,0,0,-0.2,111.1,21.9)"  >
+<path style="fill: rgb(128, 204, 40); fill-rule: nonzero; stroke: none; stroke-width: 1; stroke-linecap: butt; stroke-linejoin: miter; stroke-dasharray: none; stroke-dashoffset: 0; stroke-miterlimit: 4; opacity: 1"  paint-order="stroke"  transform="translate(-2106.8,-1383.2)" d="M 2824.8 912.4 v -419.2 c 0 -5.8 4.6 -10.4 10.4 -10.4 c 5.7 0 10.4 4.7 10.4 10.4 v 419.2 c 0 5.8 -4.7 10.4 -10.4 10.4 c -5.7 0 -10.4 -4.7 -10.4 -10.4" stroke-linecap="round" />
+</g>
+</g>
+</g>
+</svg>
--- a/workspaces/r-workspace/mkdocs/docs/assets/favicon.ico
+++ b/workspaces/r-workspace/mkdocs/docs/assets/favicon.ico
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/Cronicle.jpg
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/Cronicle.jpg
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/Filebrowser.png
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/Filebrowser.png
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/Htop.jpg
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/Htop.jpg
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/IDE.jpg
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/IDE.jpg
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/MC.jpg
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/MC.jpg
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/MkDocs.png
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/MkDocs.png
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/RStudio.png
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/RStudio.png
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/Static-server.png
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/Static-server.png
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/Terminal.png
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/Terminal.png
--- a/workspaces/r-workspace/mkdocs/docs/assets/home/Ungit.jpg
+++ b/workspaces/r-workspace/mkdocs/docs/assets/home/Ungit.jpg
--- a/workspaces/r-workspace/mkdocs/docs/javascript/config.js
+++ b/workspaces/r-workspace/mkdocs/docs/javascript/config.js
@ -0,0 +1,16 @@
+window.MathJax = {
+  tex: {
+    inlineMath: [["\\(", "\\)"]],
+    displayMath: [["\\[", "\\]"]],
+    processEscapes: true,
+    processEnvironments: true
+  },
+  options: {
+    ignoreHtmlClass: ".*|",
+    processHtmlClass: "arithmatex"
+  }
+};
+
+document$.subscribe(() => {
+  MathJax.typesetPromise()
+})
--- a/workspaces/r-workspace/mkdocs/macros/helpers.py
+++ b/workspaces/r-workspace/mkdocs/macros/helpers.py
@ -0,0 +1,57 @@
+"""
+Basic example of a Mkdocs-macros module.
+Include this  {{ macros_info() }} in any page to get complete macro info
+"""
+import os
+
+port_increments = {
+    "DOCS_URL": 0,
+    "FILEBROWSER_URL": 1,
+    "STATICFS_URL": 2,
+    "CRONICLE_URL": 3,
+    "UNGIT_URL": 4,
+    "IDE_URL": 5,
+    "TERMINAL_URL": 6,
+    "MC_URL": 7,
+    "HTOP_URL": 8
+    }
+
+# this function name should not be changed
+def define_env(env):
+    """
+    This is the hook for defining variables, macros and filters
+    - variables: the dictionary that contains the environment variables
+    - macro: a decorator function, to declare a macro.
+    - filter: a function with one of more arguments,
+        used to perform a transformation
+    """
+    @env.macro
+    def get_tool_url(env):
+        try:
+            return os.environ[env]
+        except:
+            # Get host
+            host = "localhost"
+            try:
+                host = os.environ["WRK_HOST"]
+            except:
+                pass
+            proto = "http"
+            try:
+                proto = os.environ["WRK_PROTO"]
+            except:
+                pass
+            # Entry port - port relative to which other ports will be calculated 
+            entry_port = 8020
+            try:
+                entry_port = int(os.environ["ENTRY_PORT"])
+            except:
+                pass
+            # Assign port
+            try:
+                port = port_increments[env] + entry_port
+            except:
+                port = 80
+            return f"{proto}://{host}:{port}"
+
+            
--- a/workspaces/r-workspace/mkdocs/mkdocs.yml
+++ b/workspaces/r-workspace/mkdocs/mkdocs.yml
@ -0,0 +1,69 @@
+# ===========================================================
+# NAVIGATION
+# ===========================================================
+
+nav:
+  - Home: README.md
+  - Get started: getting-started.md
+
+
+# ===========================================================
+# CONFIGURATION
+# ===========================================================
+
+site_name: My Workspace
+repo_url: https://github.com/bluxmit/alnoda-workspaces
+site_url: https://alnoda.org
+edit_uri: ""
+
+# ===========================================================
+# APPEARANCE
+# ===========================================================
+
+theme:
+  name: 'material'
+  favicon: 'assets/favicon.ico'
+  logo: 'assets/Alnoda-logo.svg'
+  custom_dir: overrides
+  icon:
+    repo: fontawesome/brands/git-alt
+  features:
+    - navigation.instant
+  palette:
+    - scheme: default
+      toggle:
+        icon: material/toggle-switch-off-outline
+        name: Switch to light mode
+      primary: brown  
+      accent: deep orange
+    - scheme: slate
+      toggle:
+        icon: material/toggle-switch
+        name: Switch to dark mode
+      primary: orange
+      accent: red
+
+extra:
+  # Link to open when your logo is clicked
+  homepage: https://alnoda.org
+  host_url: http://localhost
+
+plugins:
+  - search
+  # Enable Macros and jinja2 templates
+  - macros:
+      module_name: macros/helpers
+
+
+extra_javascript:
+  - javascripts/config.js
+  - https://polyfill.io/v3/polyfill.min.js?features=es6
+
+
+
+
+          
+ 
+
+
+
--- a/workspaces/r-workspace/mkdocs/overrides/partials/footer.html
+++ b/workspaces/r-workspace/mkdocs/overrides/partials/footer.html
--- a/workspaces/r-workspace/rstudio/database.conf
+++ b/workspaces/r-workspace/rstudio/database.conf
@ -0,0 +1,6 @@
+# =================================================================================================================
+# sqlite configuration
+# =================================================================================================================
+# Specifies the database provider to use
+provider=sqlite
+directory=/home/abc/.rserver/
--- a/workspaces/r-workspace/scripts/install_R_source.sh
+++ b/workspaces/r-workspace/scripts/install_R_source.sh
@ -0,0 +1,164 @@
+#!/bin/bash
+
+## Install R from source.
+##
+## In order of preference, first argument of the script, the R_VERSION variable.
+## ex. latest, devel, patched, 4.0.0
+##
+## 'devel' means the prerelease development version (Latest daily snapshot of development version).
+## 'patched' means the prerelease patched version (Latest daily snapshot of patched version).
+
+set -e
+
+R_VERSION=${1:-${R_VERSION:-"latest"}}
+
+apt-get update
+apt-get -y install locales lsb-release
+
+## Configure default locale
+LANG=${LANG:-"en_US.UTF-8"}
+/usr/sbin/locale-gen --lang "${LANG}"
+/usr/sbin/update-locale --reset LANG="${LANG}"
+
+UBUNTU_VERSION=$(lsb_release -sc)
+
+export DEBIAN_FRONTEND=noninteractive
+
+R_HOME=${R_HOME:-"/usr/local/lib/R"}
+
+READLINE_VERSION=8
+if [ "${UBUNTU_VERSION}" == "bionic" ]; then
+    READLINE_VERSION=7
+fi
+
+apt-get install -y --no-install-recommends \
+    bash-completion \
+    ca-certificates \
+    devscripts \
+    file \
+    fonts-texgyre \
+    g++ \
+    gfortran \
+    gsfonts \
+    libblas-dev \
+    libbz2-* \
+    libcurl4 \
+    libicu* \
+    liblapack-dev \
+    libpcre2* \
+    libjpeg-turbo* \
+    libpangocairo-* \
+    libpng16* \
+    "libreadline${READLINE_VERSION}" \
+    libtiff* \
+    liblzma* \
+    make \
+    unzip \
+    zip \
+    zlib1g
+
+BUILDDEPS="curl \
+    default-jdk \
+    libbz2-dev \
+    libcairo2-dev \
+    libcurl4-openssl-dev \
+    libpango1.0-dev \
+    libjpeg-dev \
+    libicu-dev \
+    libpcre2-dev \
+    libpng-dev \
+    libreadline-dev \
+    libtiff5-dev \
+    liblzma-dev \
+    libx11-dev \
+    libxt-dev \
+    perl \
+    rsync \
+    subversion \
+    tcl-dev \
+    tk-dev \
+    texinfo \
+    texlive-extra-utils \
+    texlive-fonts-recommended \
+    texlive-fonts-extra \
+    texlive-latex-recommended \
+    texlive-latex-extra \
+    x11proto-core-dev \
+    xauth \
+    xfonts-base \
+    xvfb \
+    wget \
+    zlib1g-dev"
+
+# shellcheck disable=SC2086
+apt-get install -y --no-install-recommends ${BUILDDEPS}
+
+## Download R from 0-Cloud CRAN mirror or CRAN
+function download_r_src() {
+    wget "https://cloud.r-project.org/src/$1" -O "R.tar.gz" ||
+        wget "https://cran.r-project.org/src/$1" -O "R.tar.gz"
+}
+
+if [ "$R_VERSION" == "devel" ]; then
+    download_r_src "base-prerelease/R-devel.tar.gz"
+elif [ "$R_VERSION" == "patched" ]; then
+    download_r_src "base-prerelease/R-latest.tar.gz"
+elif [ "$R_VERSION" == "latest" ]; then
+    download_r_src "base/R-latest.tar.gz"
+else
+    download_r_src "base/R-${R_VERSION%%.*}/R-${R_VERSION}.tar.gz"
+fi
+
+tar xzf "R.tar.gz"
+cd R-*/
+
+R_PAPERSIZE=letter \
+    R_BATCHSAVE="--no-save --no-restore" \
+    R_BROWSER=xdg-open \
+    PAGER=/usr/bin/pager \
+    PERL=/usr/bin/perl \
+    R_UNZIPCMD=/usr/bin/unzip \
+    R_ZIPCMD=/usr/bin/zip \
+    R_PRINTCMD=/usr/bin/lpr \
+    LIBnn=lib \
+    AWK=/usr/bin/awk \
+    CFLAGS="-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g" \
+    CXXFLAGS="-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g" \
+    ./configure --enable-R-shlib \
+    --enable-memory-profiling \
+    --with-readline \
+    --with-blas \
+    --with-lapack \
+    --with-tcltk \
+    --with-recommended-packages
+
+make
+make install
+make clean
+
+## Add a library directory (for user-installed packages)
+mkdir -p "${R_HOME}/site-library"
+chown root:staff "${R_HOME}/site-library"
+chmod g+ws "${R_HOME}/site-library"
+
+## Fix library path
+echo "R_LIBS=\${R_LIBS-'${R_HOME}/site-library:${R_HOME}/library'}" >>"${R_HOME}/etc/Renviron.site"
+
+## Clean up from R source install
+cd ..
+rm -rf /tmp/*
+rm -rf R-*/
+rm -rf "R.tar.gz"
+
+# shellcheck disable=SC2086
+apt-get remove --purge -y ${BUILDDEPS}
+apt-get autoremove -y
+apt-get autoclean -y
+rm -rf /var/lib/apt/lists/*
+
+# Check the R info
+echo -e "Check the R info...\n"
+
+R -q -e "sessionInfo()"
+
+echo -e "\nInstall R from source, done!"
--- a/workspaces/r-workspace/scripts/install_rstudio.sh
+++ b/workspaces/r-workspace/scripts/install_rstudio.sh
@ -0,0 +1,133 @@
+#!/bin/bash
+
+## Download and install RStudio server & dependencies uses.
+##
+## In order of preference, first argument of the script, the RSTUDIO_VERSION variable.
+## ex. stable, preview, daily, 1.3.959, 2021.09.1+372, 2021.09.1-372, 2022.06.0-daily+11
+
+set -e
+
+RSTUDIO_VERSION=${1:-${RSTUDIO_VERSION:-"stable"}}
+DEFAULT_USER=${DEFAULT_USER:-"rstudio"}
+
+# a function to install apt packages only if they are not installed
+function apt_install() {
+    if ! dpkg -s "$@" >/dev/null 2>&1; then
+        if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+            apt-get update
+        fi
+        apt-get install -y --no-install-recommends "$@"
+    fi
+}
+
+apt_install \
+    lsb-release \
+    file \
+    git \
+    libapparmor1 \
+    libclang-dev \
+    libcurl4-openssl-dev \
+    libedit2 \
+    libobjc4 \
+    libssl-dev \
+    libpq5 \
+    lsb-release \
+    psmisc \
+    procps \
+    python-setuptools \
+    pwgen \
+    sudo \
+    wget
+
+ARCH=$(dpkg --print-architecture)
+UBUNTU_VERSION=$(lsb_release -sc)
+
+# install s6 supervisor
+/rocker_scripts/install_s6init.sh
+
+## Download RStudio Server for Ubuntu 18+
+DOWNLOAD_FILE=rstudio-server.deb
+
+if [ "$RSTUDIO_VERSION" = "latest" ]; then
+    RSTUDIO_VERSION="stable"
+fi
+
+if [ "$UBUNTU_VERSION" = "focal" ]; then
+    UBUNTU_VERSION="bionic"
+fi
+
+if [ "$RSTUDIO_VERSION" = "stable" ] || [ "$RSTUDIO_VERSION" = "preview" ] || [ "$RSTUDIO_VERSION" = "daily" ]; then
+    wget "https://rstudio.org/download/latest/${RSTUDIO_VERSION}/server/${UBUNTU_VERSION}/rstudio-server-latest-${ARCH}.deb" -O "$DOWNLOAD_FILE"
+else
+    wget "https://download2.rstudio.org/server/${UBUNTU_VERSION}/${ARCH}/rstudio-server-${RSTUDIO_VERSION/"+"/"-"}-${ARCH}.deb" -O "$DOWNLOAD_FILE" ||
+        wget "https://s3.amazonaws.com/rstudio-ide-build/server/${UBUNTU_VERSION}/${ARCH}/rstudio-server-${RSTUDIO_VERSION/"+"/"-"}-${ARCH}.deb" -O "$DOWNLOAD_FILE"
+fi
+
+dpkg -i "$DOWNLOAD_FILE"
+rm "$DOWNLOAD_FILE"
+
+# https://github.com/rocker-org/rocker-versioned2/issues/137
+rm -f /var/lib/rstudio-server/secure-cookie-key
+
+## RStudio wants an /etc/R, will populate from $R_HOME/etc
+mkdir -p /etc/R
+
+## Make RStudio compatible with case when R is built from source
+## (and thus is at /usr/local/bin/R), because RStudio doesn't obey
+## path if a user apt-get installs a package
+R_BIN=$(which R)
+echo "rsession-which-r=${R_BIN}" >/etc/rstudio/rserver.conf
+## use more robust file locking to avoid errors when using shared volumes:
+echo "lock-type=advisory" >/etc/rstudio/file-locks
+
+## Prepare optional configuration file to disable authentication
+## To de-activate authentication, `disable_auth_rserver.conf` script
+## will just need to be overwrite /etc/rstudio/rserver.conf.
+## This is triggered by an env var in the user config
+cp /etc/rstudio/rserver.conf /etc/rstudio/disable_auth_rserver.conf
+echo "auth-none=1" >>/etc/rstudio/disable_auth_rserver.conf
+
+## Set up RStudio init scripts
+mkdir -p /etc/services.d/rstudio
+cat <<"EOF" >/etc/services.d/rstudio/run
+#!/usr/bin/with-contenv bash
+## load /etc/environment vars first:
+for line in $( cat /etc/environment ) ; do export $line > /dev/null; done
+exec /usr/lib/rstudio-server/bin/rserver --server-daemonize 0
+EOF
+
+cat <<EOF >/etc/services.d/rstudio/finish
+#!/bin/bash
+/usr/lib/rstudio-server/bin/rstudio-server stop
+EOF
+
+# If CUDA enabled, make sure RStudio knows (config_cuda_R.sh handles this anyway)
+if [ -n "$CUDA_HOME" ]; then
+    sed -i '/^rsession-ld-library-path/d' /etc/rstudio/rserver.conf
+    echo "rsession-ld-library-path=$LD_LIBRARY_PATH" >>/etc/rstudio/rserver.conf
+fi
+
+# Log to stderr
+cat <<EOF >/etc/rstudio/logging.conf
+[*]
+log-level=warn
+logger-type=syslog
+EOF
+
+# set up default user
+/rocker_scripts/default_user.sh "${DEFAULT_USER}"
+
+# install user config initiation script
+cp /rocker_scripts/init_set_env.sh /etc/cont-init.d/01_set_env
+cp /rocker_scripts/init_userconf.sh /etc/cont-init.d/02_userconf
+cp /rocker_scripts/pam-helper.sh /usr/lib/rstudio-server/bin/pam-helper
+
+# Clean up
+rm -rf /var/lib/apt/lists/*
+
+# Check the RStudio Server version
+echo -e "Check the RStudio Server version...\n"
+
+/usr/lib/rstudio-server/bin/rstudio-server version
+
+echo -e "\nInstall RStudio Server, done!"
--- a/workspaces/r-workspace/scripts/setup_R.sh
+++ b/workspaces/r-workspace/scripts/setup_R.sh
@ -0,0 +1,98 @@
+#!/bin/bash
+
+## Update configuration files for R and install some libraries.
+##
+## The URL of the default repository for R packages written to Rprofile.site,
+## refers to the CRAN environment variable or to the first argument of this script.
+## In order of preference, first argument of the script, the CRAN variable.
+## ex. https://cloud.r-project.org, https://cran.r-project.org
+
+set -e
+
+CRAN=${1:-${CRAN:-"https://cran.r-project.org"}}
+
+ARCH=$(uname -m)
+
+# a function to install apt packages only if they are not installed
+function apt_install() {
+    if ! dpkg -s "$@" >/dev/null 2>&1; then
+        if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+            apt-get update
+        fi
+        apt-get install -y --no-install-recommends "$@"
+    fi
+}
+
+apt_install lsb-release
+
+##  mechanism to force source installs if we're using RSPM
+UBUNTU_VERSION=$(lsb_release -sc)
+CRAN_SOURCE=${CRAN/"__linux__/$UBUNTU_VERSION/"/""}
+
+## source install if using RSPM and arm64 image
+if [ "$ARCH" = "aarch64" ]; then
+    CRAN=$CRAN_SOURCE
+fi
+
+## Add a default CRAN mirror
+echo "options(repos = c(CRAN = '${CRAN}'), download.file.method = 'libcurl')" >>"${R_HOME}/etc/Rprofile.site"
+
+## Set HTTPUserAgent for RSPM (https://github.com/rocker-org/rocker/issues/400)
+cat <<EOF >>"${R_HOME}/etc/Rprofile.site"
+# https://docs.rstudio.com/rspm/admin/serving-binaries/#binaries-r-configuration-linux
+options(HTTPUserAgent = sprintf("R/%s R (%s)", getRversion(), paste(getRversion(), R.version["platform"], R.version["arch"], R.version["os"])))
+EOF
+
+## Install OpenBLAS and hot-switching to it
+## https://github.com/rocker-org/rocker-versioned2/issues/390
+if ! dpkg -l | grep -q libopenblas-dev; then
+    apt_install libopenblas-dev
+    update-alternatives --set "libblas.so.3-${ARCH}-linux-gnu" "/usr/lib/${ARCH}-linux-gnu/openblas-pthread/libblas.so.3"
+fi
+
+## Install littler
+if [ ! -x "$(command -v r)" ]; then
+    BUILDDEPS="libpcre2-dev \
+        liblzma-dev \
+        libbz2-dev \
+        zlib1g-dev \
+        libicu-dev"
+
+    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+        apt-get update
+    fi
+    # shellcheck disable=SC2086
+    apt_install ${BUILDDEPS}
+    Rscript -e "install.packages(c('littler', 'docopt'), repos='${CRAN_SOURCE}')"
+
+    # Clean up
+    # shellcheck disable=SC2086
+    apt-get remove --purge -y ${BUILDDEPS}
+    apt-get autoremove -y
+    apt-get autoclean -y
+fi
+
+## Symlink littler and littler's installation scripts
+ln -sf "${R_HOME}/site-library/littler/bin/r" /usr/local/bin/r
+ln -sf "${R_HOME}/site-library/littler/examples/installGithub.r" /usr/local/bin/installGithub.r
+
+## Use rocker scripts version install2.r if it exists
+if [ -f "/rocker_scripts/bin/install2.r" ]; then
+    ln -sf /rocker_scripts/bin/install2.r /usr/local/bin/install2.r
+else
+    ln -sf "${R_HOME}/site-library/littler/examples/install2.r" /usr/local/bin/install2.r
+fi
+
+# Clean up
+rm -rf /var/lib/apt/lists/*
+
+# Check the R info
+echo -e "Check the littler info...\n"
+
+r --version
+
+echo -e "Check the R info...\n"
+
+R -q -e "sessionInfo()"
+
+echo -e "Setup R, done!"
--- a/workspaces/r-workspace/supervisord-rstudio.conf
+++ b/workspaces/r-workspace/supervisord-rstudio.conf
@ -0,0 +1,6 @@
+[program:rstudio]
+directory=/home/abc
+command=/bin/sh -c ' echo $RSTUDIO_SERVER_HOST | xargs -I{} rserver --www-address={} --auth-none=1 --www-frame-origin=same --www-port=8025 --www-verify-user-agent=0 --server-data-dir=/home/abc/.rserver --server-user=abc --server-pid-file=/home/abc/.rserver/rstudio.pid --database-config-file=/home/abc/.rserver/database.conf --server-working-dir=/home/abc/.rserver '
+stderr_logfile = /var/log/rstudio/rstudio-stderr.log
+stdout_logfile = /var/log/rstudio/rstudio-stdout.log
+logfile_maxbytes = 1024
--- a/workspaces/scala-workspace/Dockerfile
+++ b/workspaces/scala-workspace/Dockerfile
@ -0,0 +1,26 @@
+ARG docker_registry=docker.io/alnoda
+ARG image_tag=2.0-17
+
+FROM ${docker_registry}/java-workspace:${image_tag}
+USER root
+
+COPY docs/getting-started.md /home/docs/docs/getting-started.md
+
+RUN echo "------------------------------------------------------ coursier" \
+    && cd /tmp && curl -fL https://github.com/coursier/launchers/raw/master/cs-x86_64-pc-linux.gz | gzip -d > cs \
+    && chmod +x /tmp/cs \
+    && mv /tmp/cs /usr/bin/ \
+    && echo "------------------------------------------------------ user" \
+    && find /home -type d | xargs -I{} chown -R abc {} \
+    && find /home -type f | xargs -I{} chown abc {} 
+    
+ENV PATH="$PATH:/home/abc/.local/share/coursier/bin"
+ENV PATH="$PATH:/home/abc/.local/share/coursier/bin"
+
+USER abc
+
+RUN echo "------------------------------------------------------ coursier (user) " \
+    && cs setup
+
+
+
--- a/workspaces/scala-workspace/README.md
+++ b/workspaces/scala-workspace/README.md
@ -0,0 +1,66 @@
+<p align="center">
+  <img src="https://github.com/bluxmit/alnoda-workspaces/blob/main/img/Alnoda-white.svg" alt="Alnoda logo" width="150">
+</p> 
+
+# Scala workspace 
+
+Docker image with Scala and browser-based VS-Code version.
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/codeserver-workspace/img/codeserver-collage-sm.jpg" alt="Collage" width="750">
+</p>
+
+## Why this images
+
+1. If you need self-hosted remote development environment.
+2. If you want to be one command away from coding in Scala.
+
+## Start
+ 
+```
+docker run --name space-1 -d -p 8020-8035:8020-8035 alnoda/scala-workspace
+```  
+
+and open [localhost:8020](http://localhost:8020) in browser.  
+
+## Features
+
+- [Scala](https://www.scala-lang.org/)
+- [Coursier](https://get-coursier.io/)
+- [Sbt](https://www.scala-sbt.org/)
+- Java
+- Maven
+
+**Dev tools:**
+
+- [**Code-server**](https://github.com/cdr/code-server) - open source version of popular Visual Studio Code IDE. Codeserver has 
+VS-Code extensions and works in browser. 
+- [**Terminal**](https://github.com/tsl0922/ttyd) - secure browser-based terminal.
+- [**FileBrowser**](https://github.com/filebrowser/filebrowser)  - manage files and folders inside the workspace, and exchange data between local environment and the workspace
+- [**Cronicle**](https://github.com/jhuckaby/Cronicle)  - task scheduler and runner, with a web based front-end UI. It handles both scheduled, repeating and on-demand jobs, targeting any number of worker servers, with real-time stats and live log viewer.
+- [**Static File Server**](https://github.com/vercel/serve) - view any static html sites as easy as if you do it on your local machine. Serve static websites easily.
+- [**Ungit**](https://github.com/FredrikNoren/ungit) - rings user friendliness to git without sacrificing the versatility of it.
+- [**MkDocs**](https://squidfunk.github.io/mkdocs-material/)  - create awesome documentation for your project with only markdown. 
+- [**Midnight Commander**](https://midnight-commander.org/)  - Feature rich visual file manager with internal text viewer and editor. 
+- [**Process Monitor**](https://htop.dev/)  - Monitor running process and resource utilization. 
+- Quicklaunch UI with getting started tutorial
+
+Image is built from **Ubuntu 20.4** with the additional CLI apps
+
+- [Zsh](https://www.zsh.org/), [Oh my Zsh](https://ohmyz.sh/)
+- Python 3, Pip 
+- Node/nodeenv
+- curl, wget, telnet, jq
+- **Git:** git, git-flow, lazygit 
+- **File browsers:** mc, xplr
+- **Text editors:** nano, vim, mcedit
+- **System monitors:** ncdu, htop, glances, vizex
+- **Process Control:** supervisord
+- **Job scheduler:** cron
+
+## Docs
+See our guides on [**getting started**](docs/getting-started.md) and [**advanced features**](../ubuntu-workspace/docs/workspaces.md).
+
+
+
+
--- a/workspaces/scala-workspace/docs/getting-started.md
+++ b/workspaces/scala-workspace/docs/getting-started.md
@ -0,0 +1,117 @@
+# Getting started
+
+## Intro  
+
+To start, open Quickstart page [localhost:8020](http://localhost:8020/) for quick access to all the tools
+    
+From the quicklaunch page you can open workspace tools, such as code editor or terminal 
+
+<div align="center" style="font-style: italic;">
+    Demo: Workspace UI 
+</div>
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/ide-workspace/img/wid-ui.png" alt="wid-ui.png" width="750">
+</p>
+
+The main code editor of this workspace is [Code-server](https://github.com/cdr/code-server)
+
+<div align="center" style="font-style: italic;">
+    Demo: Code-server
+</div>
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/codeserver-workspace/img/codeserver-demo.gif" alt="Code-server demo" width="900">
+</p>
+
+Workspace has full-size browser-base terminal
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/base-workspace/img/base-workspace-terminal.gif" alt="Base-Workspace terminal" width="750">
+</p> 
+
+
+## Scala
+
+To check scala version, execute in terminal
+
+```
+scala -version
+```
+
+To open scala REPL simply execute
+
+```
+scala
+```
+
+<p align="center">
+  <img src="https://raw.githubusercontent.com/bluxmit/alnoda-workspaces/main/workspaces/scala-workspace/img/scala-repl.png" alt="scala-repl.png" width="500">
+</p>
+
+### Hello world
+
+Use Code editor to create folder `helloworld` with file `Hello.scala` in it. The file should have the following content 
+
+```
+object Hello {
+    def main(args: Array[String]) = {
+        println("Hello, world")
+    }
+}
+```
+
+Open terminal, go into this folder and execute 
+
+```
+scala Hello.scala 
+```
+
+### Hello world with sbt
+
+cd to the projects directory, and create new project with Sbt 
+
+```
+cd /home/project
+sbt new scala/scala3.g8
+```
+
+Upon prompt type any project name, i.e. "hello-world". Sbt will generate progje boilerplate with the required folder structure.  
+
+Enter the project folder, compile and run the app
+
+```
+sbt run 
+```
+
+
+## Coursier
+
+[Coursier](https://get-coursier.io/) is the Scala application and artifact manager. It can install Scala applications and setup your Scala development environment. 
+It can also download and cache artifacts from the web.  
+
+Coursier provides a number of services:
+- manage the installed Scala applications: `install`, `list`, `update`, `uninstall`, `search`
+- configure channels to install Scala applications from: `channel`
+- launchers for Scala applications: `launch`, `bootstrap`
+- manage the installed JVMs: `java`, `java-home`
+- directly manipulate Maven dependencies: `fetch`, `resolve`
+- perform setup again
+
+List all applications, installed by Coursier
+
+```
+cs list
+```
+
+The `install` command installs Scala applications, i.e. 
+
+```
+cs install scalafmt
+```
+
+If you want to launch another scala version 
+
+```
+cs launch scala:2.12.15
+```
--- a/workspaces/scala-workspace/img/scala-repl.png
+++ b/workspaces/scala-workspace/img/scala-repl.png