Add pip shim

shims/pip

@@ -0,0 +1,97 @@
+#! /usr/bin/env bash
+#
+# This script wraps pip to run `asdf reshim` after installs and uninstalls.
+# Any other cases are passed-through to pip.
+#
+# Based on the npm shim: https://github.com/asdf-vm/asdf-nodejs/blob/b2d06a768d9a14186db72018df10604bdb384436/shims/npm
+
+set -euo pipefail
+
+this_dir=$(dirname "${BASH_SOURCE[0]}")
+this_dir=$(cd "$this_dir" && pwd -P) # Normalizes the directory; see https://stackoverflow.com/a/7666/2308068
+plugin_name=$(basename "$(dirname "$this_dir")")
+
+asdf_data_dir=$(cd "${ASDF_DATA_DIR:-$HOME/.asdf}" && pwd -P)
+asdf_shims_dir="$asdf_data_dir/shims"
+
+plugin_dir="$asdf_data_dir/plugins/$plugin_name"
+
+should_reshim() {
+  if [ "${ASDF_PYTHON_SKIP_RESHIM:-}" ]; then
+    return 1
+  fi
+
+  for arg; do
+    case "$arg" in
+      install|uninstall)
+        return 0
+      ;;
+    esac
+  done
+
+  return 1
+}
+
+resolve_pip() {
+  # Try searching in current path (asdf core from 0.7 onwards adds all binaries candidates directories to PATH)
+  # if that doesn't works (when calling the shim directly for example) it tries manually searching the binary in
+  # the installed version provided by "asdf where"
+  local pip_location="${ASDF_NODEJS_CANON_PIP_PATH:-$(search_pip_on_current_path || manually_search_pip_bin)}"
+
+  if ! [ "$pip_location" ]; then
+    echo "asdf-python couldn't find a suitable pip executable"
+    echo "This is probably a problem with the plugin, please report this issue"
+    exit 1
+  fi
+
+  echo "$pip_location"
+}
+
+remove_current_dir_from_path() {
+  local filtered_path= dir= normalized_dir=
+
+  while read -rd : dir; do
+    if [ -d "$dir" ]; then
+      normalized_dir=$(cd "$dir" && pwd -P)
+
+      if [ "$normalized_dir" = "$this_dir" ] || [ "$normalized_dir" = "$asdf_shims_dir" ]; then
+        continue
+      fi
+    fi
+
+    filtered_path+="$dir:"
+  done <<< "$PATH:"
+
+  echo "${filtered_path%:}"
+}
+
+search_pip_on_current_path() {
+  # Tries to prevent recursion by removing the current script and asdf-shim from PATH
+  local filtered_path=$(remove_current_dir_from_path)
+  PATH="$filtered_path" command -v pip
+}
+
+manually_search_pip_bin() {
+  local probably_pip="$(asdf where python)/bin/pip"
+
+  if [ -x "$probably_pip" ]; then
+    echo "$probably_pip"
+    return 0
+  fi
+
+  return 1
+}
+
+wrap_pip() {
+  local pip=$(resolve_pip)
+
+  if should_reshim "$@"; then
+    "$pip" "$@"
+    echo "Reshimming asdf $plugin_name..."
+    asdf reshim "$plugin_name"
+  else
+    exec "$pip" "$@"
+  fi
+}
+
+wrap_pip "$@"