First commit with help and version commands, start README and custom logger

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true

README.md

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+# dctlenv
+
+Version manager for [driftctl](https://github.com/cloudskiff/driftctl) inspired by [tfenv](https://github.com/tfutils/tfenv).
+
+## Installation
+
+### Basic GitHub Checkout
+
+This will get you going with the latest version of dctlenv and make it easy to fork and contribute any changes back upstream.
+
+**1. Check out dctlenv where you want**
+
+```shell
+$ git clone https://github.com/wbeuil/dctlenv ~/.dctlenv
+```
+
+**2. Add `~/.dctlenv/bin` to your `$PATH` for access to the dctlenv CLI**
+
+- For **Bash**:
+
+```shell
+$ echo 'export PATH="$HOME/.dctlenv/bin:$PATH"' >> ~/.bash_profile
+```
+
+- For **Zsh**:
+
+```shell
+$ echo 'export PATH="$HOME/.dctlenv/bin:$PATH"' >> ~/.zshrc
+```
+
+- For **Fish**:
+
+```shell
+$ set -Ux fish_user_paths $HOME/.dctlenv/bin $fish_user_paths
+```
+
+**3. Restart your shell so that PATH changes take effect**
+
+#### Upgrading With Git
+
+If you've installed dctlenv using the instructions above, you can upgrade to the latest version by pulling from GitHub.
+
+```shell
+$ cd ~/.dctlenv
+$ git pull
+```
+
+## Uninstalling dctlenv
+
+You will need to first remove the line from your shell startup configuration file. This will remove dctlenv shims directory from your `$PATH`.
+
+Then, you just need to remove its root directory:
+
+```shell
+$ rm -rf `dctlenv root`
+```

bin/dctlenv

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+#!/usr/bin/env bash
+set -uo pipefail
+
+panic() {
+  echo "panic: $*" >&2
+  exit 1
+}
+
+if [ -z "${DCTLENV_ROOT:-""}" ]; then
+  # http://stackoverflow.com/questions/1055671/how-can-i-get-the-behavior-of-gnus-readlink-f-on-a-mac
+  readlink_f() {
+    local target_file="$1"
+    local file_name
+
+    while [ "$target_file" != "" ]; do
+      cd "$(dirname $target_file)"
+      file_name="$(basename "$target_file")"
+      target_file="$(readlink "$file_name")"
+    done
+
+    echo "$(pwd -P)/$file_name"
+  }
+
+  DCTLENV_ROOT="$(cd "$(dirname "$(readlink_f "$0")")/.." && pwd)"
+  [ -n $DCTLENV_ROOT ] || panic "Failed to set DCTLENV_ROOT"
+else
+  DCTLENV_ROOT="${DCTLENV_ROOT%/}"
+fi
+export DCTLENV_ROOT
+
+if source "$DCTLENV_ROOT/lib/utils.sh"; then
+  log_debug "Utils from $DCTLENV_ROOT/lib/utils.sh sourced successfully"
+else
+  panic "Failed to source utils from $DCTLENV_ROOT/lib/utils.sh"
+fi
+
+for dir in libexec bin; do
+  case ":$PATH:" in
+    *:$DCTLENV_ROOT/$dir:*)
+      log_debug "\$PATH already contains '$DCTLENV_ROOT/$dir'"
+      ;;
+    *)
+      log_debug "Adding '$DCTLENV_ROOT/$dir' to \$PATH"
+      export PATH="$DCTLENV_ROOT/$dir:$PATH"
+      ;;
+  esac
+done
+
+source "$DCTLENV_ROOT/libexec/dctlenv"

lib/log.sh

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+#!/usr/bin/env bash
+set -uo pipefail
+
+log() {
+  local text="$2"
+
+  local level="$(echo "$1" | awk '{print toupper($0)}')"
+
+  local date="$(date +"%Y-%m-%d %H:%M:%S")"
+
+  local line="$date [$level] $text"
+
+  case "$1" in
+    'info' | 'debug' | 'warn')
+      if [ "${DCTLENV_DEBUG:-0}" -gt 0 ]; then
+        echo "$line" >&2
+      fi
+      ;;
+    'error')
+      if [ "${DCTLENV_DEBUG:-0}" -gt 0 ]; then
+        echo "$line" >&2
+      fi
+      exit 1
+      ;;
+    *)
+      log_error "Undefined log level: $*"
+      ;;
+  esac
+}
+
+log_info() {
+  log "info" "$1"
+}
+
+log_debug() {
+  log "debug" "$1"
+}
+
+log_warn() {
+  log "warn" "$1"
+}
+
+log_error() {
+  log "error" "$1"
+}

lib/utils.sh

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+#!/usr/bin/env bash
+set -uo pipefail
+
+source "$DCTLENV_ROOT/lib/log.sh"

libexec/dctlenv

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+#!/usr/bin/env bash
+set -uo pipefail
+
+abort() {
+  {
+    if [ "$#" -eq 0 ]; then
+      cat -
+    else
+      echo "dctlenv: $*"
+      echo ""
+    fi
+  } >&2
+  dctlenv-help
+  exit 1
+}
+
+command="${1:-""}"
+
+log_info "CLI command args: \"$command\""
+
+case "$command" in
+  "")
+    {
+      dctlenv-version
+      echo ""
+      dctlenv-help
+    }
+    exit 0
+    ;;
+  -v | --version)
+    exec dctlenv-version
+    ;;
+  -h | --help)
+    exec dctlenv-help
+    ;;
+  *)
+    command_path="$(command -v "dctlenv-$command" || true)"
+    if [ -z "$command_path" ]; then
+      abort "unknown command \"$command\""
+    fi
+    shift 1
+    exec "$command_path" "$@"
+    ;;
+esac

libexec/dctlenv-help

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+#!/usr/bin/env bash
+set -uo pipefail
+
+echo 'Usage: dctlenv <command> [<options>]
+
+Commands:
+  install           Install a specific version of driftctl
+  uninstall         Uninstall a specific version of driftctl
+  use               Switch a version to use
+  list              List all installed versions
+  list-remote       List all installable versions
+  version           Display dctlenv version
+  help              Show this help output
+
+Flags:
+  -v, --version     An alias for the "version" command
+  -h, --help        An alias for the "help" command
+
+For full documentation, see: https://github.com/wbeuil/dctlenv#readme'

libexec/dctlenv-root

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+#!/usr/bin/env bash
+set -uo pipefail
+
+echo $DCTLENV_ROOT

libexec/dctlenv-version

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+#!/usr/bin/env bash
+set -uo pipefail
+
+version="0.0.2"
+git_revision=""
+
+if cd "${BASH_SOURCE%/*}" 2>/dev/null && git remote -v 2>/dev/null | grep -q dctlenv; then
+  git_revision="$(git describe --tags HEAD 2>/dev/null || true)"
+  git_revision="${git_revision#v}"
+fi
+
+echo "dctlenv ${git_revision:-$version}"