feat: add command for communizing gems

lib/commands/command-communize-all.bash

@@ -0,0 +1,12 @@
+# shellcheck shell=bash
+
+# shellcheck source=lib/utils.sh
+source "$(dirname "${BASH_SOURCE[0]}")/../utils.sh"
+
+install_dir=$(asdf where ruby)
+install_dir="${install_dir%/*}"
+
+for version_dir in "$install_dir"/*
+do
+    communize_gems "$version_dir"
+done

lib/commands/command-communize.bash

@@ -0,0 +1,15 @@
+# shellcheck shell=bash
+
+version="$1"
+
+# shellcheck source=lib/utils.sh
+source "$(dirname "${BASH_SOURCE[0]}")/../communize.bash"
+
+install_dir=$(asdf where ruby)
+
+if [[ -n "$version" ]]
+then
+    install_dir="${install_dir%/*}/$version"
+fi
+
+communize_gems "$install_dir"

lib/communize.bash

@@ -0,0 +1,40 @@
+#shellcheck shell=bash
+
+communize_gems(){
+
+  local install_path="$1"
+
+  local version gem_dir  etc_dir
+  version=$(basename "$install_path")
+
+  etc_dir="${install_path}/etc"
+  communal_dir="${ASDF_DIR}/installs/rubygems"
+  gem_dir="${communal_dir}/$( communize_version "$version")"
+  individual_gem_dir="${install_path}/lib/ruby/gems"
+
+  if [[ ! -d "$gem_dir" ]]
+  then
+      mkdir  "$gem_dir"
+  fi
+
+  if [[ -L "$individual_gem_dir" ]]
+  then
+      echo "Gems for ruby ${version} already communized"
+  elif [[ -d "$individual_gem_dir" ]]
+  then
+      rm -rf "$individual_gem_dir"
+  else
+    ln -s "$communal_dir" "$individual_gem_dir"
+    mkdir -p "$etc_dir"
+      if [[ ! -f "$etc_dir/gemrc" ]]
+      then
+        printf 'gemhome: %s\n' "$gem_dir" > "$etc_dir/gemrc"
+      fi
+  fi
+
+}
+
+communize_version(){
+    local version="$1"
+    echo "${version%.*}.0"
+}