Add resources directory with baseline common file/templates

resources/bash/pyenv.sh

@@ -0,0 +1,76 @@
+#!/env/bash
+
+function pyenv () {
+    usage="Custom Python virtualenv manager
+sivenv [list, delete, load, new] [VENV]
+Commands:
+  list                List existing virtualenvs (alias: 'ls')
+  load VENV           Activate the virtualenv named VENV (alias: 'source')
+  new VENV [VERSION]  Create and load a new virtualenv named VENV. Optionally VERSION
+                      can be a python version to use for creating the venv. Note that
+                      only python3 versions are supported.
+  delete VENV         Delete the virtualenv named VENV (alias: 'rm')";
+
+    if [ $# -eq 0 ]; then
+        echo "Error: no command specified" >&2;
+        echo "$usage";
+        return 1;
+    fi;
+
+    case $1 in
+        "-h"| "--help")
+            echo "$usage";
+            return 0;;
+        "ls"| "list")
+            lsvenv "$VIRTUALENV_DIR";;
+        "rm"| "delete")
+            if [ $# -ne 2 ]; then
+                echo "Error: no virtualenv specified" >&2;
+                return 1;
+            fi;
+            rm --recursive --force "${VIRTUALENV_DIR:?}/$2";;
+        "source" | "load")
+            if [ $# -ne 2 ]; then
+                echo "Error: no virtualenv specified" >&2;
+                return 1;
+            fi;
+            # shellcheck source=/dev/null
+            source "$VIRTUALENV_DIR/$2/bin/activate";;
+        "new")
+            if [ $# -lt 2 ]; then
+                echo "Error: no virtualenv specified" >&2;
+                return 1;
+            fi;
+            if [ $# -eq 3 ]; then
+                version="$3";
+            else
+                version="3";
+            fi
+            if ! command -v "python$version" &>/dev/null; then
+                echo "Error: no interpreter found for python version '$version'" >&2;
+                return 2;
+            fi
+
+            if python$version -m venv "$VIRTUALENV_DIR/$2"; then
+                echo "New virtualenv '$2' created using $(command -v python$version)" >&2;
+                # shellcheck source=/dev/null
+                source "$VIRTUALENV_DIR/$2/bin/activate"
+            else
+                return $?;
+            fi;;
+        *)
+            echo "Error: unknown command '$1'" >&2;
+            echo "$usage";
+            return 1;;
+    esac
+}
+
+function lsvenv () {
+    venvs=()
+    for item in /usr/bin/ls -d "$1"/*/; do
+        if stat "${item}/bin/activate" &>/dev/null; then
+          venvs+=("$(basename "$item")");
+        fi
+    done
+    echo "${venvs[*]}"
+}