Add activate/deactivate hooks (#452)

bin/pyenv-sh-activate

@@ -25,6 +25,27 @@ resolve_link() {
 unset FORCE
 unset QUIET
 
+# Define `before_activate` and `after_activate` functions that allow
+# plugin hooks to register a string of code for execution before or
+# after activating a virtualenv.
+declare -a before_hooks after_hooks
+
+before_activate() {
+  local hook="$1"
+  before_hooks["${#before_hooks[@]}"]="$hook"
+}
+
+after_activate() {
+  local hook="$1"
+  after_hooks["${#after_hooks[@]}"]="$hook"
+}
+
+# Load plugin hooks.
+OLDIFS="$IFS"
+IFS=$'\n' scripts=(`pyenv-hooks activate`)
+IFS="$OLDIFS"
+for script in "${scripts[@]}"; do source "$script"; done
+
 while [ $# -gt 0 ]; do
   case "$1" in
   "--complete" )
@@ -137,6 +158,9 @@ fi
 
 pyenv-sh-deactivate --force --quiet || true
 
+# Execute `before_activate` hooks.
+for hook in "${before_hooks[@]}"; do eval "$hook"; done
+
 if [ -n "$PYENV_VIRTUALENV_VERBOSE_ACTIVATE" ]; then
   echo "pyenv-virtualenv: activate ${venv}" 1>&2
 fi
@@ -258,3 +282,6 @@ if [ -d "${prefix}/conda-meta" ] ||
   esac
   shopt -u nullglob
 fi
+
+# Execute `after_activate` hooks.
+for hook in "${after_hooks[@]}"; do eval "$hook"; done

bin/pyenv-sh-deactivate

@@ -16,6 +16,27 @@ fi
 unset FORCE
 unset QUIET
 
+# Define `before_deactivate` and `after_deactivate` functions that allow
+# plugin hooks to register a string of code for execution before or
+# after deactivating a virtualenv.
+declare -a before_hooks after_hooks
+
+before_deactivate() {
+  local hook="$1"
+  before_hooks["${#before_hooks[@]}"]="$hook"
+}
+
+after_deactivate() {
+  local hook="$1"
+  after_hooks["${#after_hooks[@]}"]="$hook"
+}
+
+# Load plugin hooks.
+OLDIFS="$IFS"
+IFS=$'\n' scripts=(`pyenv-hooks deactivate`)
+IFS="$OLDIFS"
+for script in "${scripts[@]}"; do source "$script"; done
+
 while [ $# -gt 0 ]; do
   case "$1" in
   "-f" | "--force" )
@@ -54,6 +75,9 @@ else
   venv="${prefix##*/}"
 fi
 
+# Execute `before_deactivate` hooks.
+for hook in "${before_hooks[@]}"; do eval "$hook"; done
+
 if [ -n "$PYENV_VIRTUALENV_VERBOSE_ACTIVATE" ]; then
   echo "pyenv-virtualenv: deactivate ${venv}" 1>&2
 fi
@@ -191,3 +215,6 @@ fi;
 EOS
   ;;
 esac
+
+# Execute `after_deactivate` hooks.
+for hook in "${after_hooks[@]}"; do eval "$hook"; done

test/activate.bats

@@ -16,6 +16,7 @@ setup() {
   unset PYENV_VIRTUAL_ENV_DISABLE_PROMPT
   unset VIRTUAL_ENV_DISABLE_PROMPT
   unset _OLD_VIRTUAL_PS1
+  stub pyenv-hooks "activate : echo"
 }
 
 @test "activate virtualenv from current version" {

test/conda-activate.bats

@@ -17,6 +17,11 @@ setup() {
   unset PYENV_VIRTUAL_ENV_DISABLE_PROMPT
   unset VIRTUAL_ENV_DISABLE_PROMPT
   unset _OLD_VIRTUAL_PS1
+  stub pyenv-hooks "activate : echo"
+}
+
+teardown() {
+  unstub pyenv-hooks
 }
 
 @test "activate conda root from current version" {

test/conda-deactivate.bats

@@ -16,6 +16,11 @@ setup() {
   unset PYENV_VIRTUAL_ENV_DISABLE_PROMPT
   unset VIRTUAL_ENV_DISABLE_PROMPT
   unset _OLD_VIRTUAL_PS1
+  stub pyenv-hooks "deactivate : echo"
+}
+
+teardown() {
+  unstub pyenv-hooks
 }
 
 @test "deactivate conda root" {

test/deactivate.bats

@@ -16,6 +16,7 @@ setup() {
   unset PYENV_VIRTUAL_ENV_DISABLE_PROMPT
   unset VIRTUAL_ENV_DISABLE_PROMPT
   unset _OLD_VIRTUAL_PS1
+  stub pyenv-hooks "deactivate : echo"
 }
 
 @test "deactivate virtualenv" {

test/hooks.bats

@@ -40,3 +40,74 @@ OUT
   unstub pyenv-rehash
   teardown_version "3.5.1"
 }
+
+@test "pyenv-sh-activate hooks" {
+  cat > "${HOOK_PATH}/activate.bash" <<OUT
+before_activate 'echo "before"'
+after_activate 'echo "after"'
+OUT
+  export PYENV_VIRTUALENV_INIT=1
+
+  stub pyenv-version-name "echo venv"
+  stub pyenv-virtualenv-prefix ""
+  stub pyenv-prefix "venv : echo \"${PYENV_ROOT}/versions/venv\""
+  stub pyenv-hooks "activate : echo '$HOOK_PATH'/activate.bash"
+  stub pyenv-sh-deactivate ""
+
+  PYENV_SHELL="bash" PYENV_VERSION="venv" run pyenv-sh-activate
+
+  assert_success
+  assert_output <<EOS
+before
+export PYENV_VIRTUAL_ENV="${PYENV_ROOT}/versions/venv";
+export VIRTUAL_ENV="${PYENV_ROOT}/versions/venv";
+export _OLD_VIRTUAL_PS1="\${PS1:-}";
+export PS1="(venv) \${PS1:-}";
+after
+EOS
+
+  unstub pyenv-version-name
+  unstub pyenv-virtualenv-prefix
+  unstub pyenv-prefix
+  unstub pyenv-hooks
+  unstub pyenv-sh-deactivate
+}
+
+@test "deactivate virtualenv" {
+  cat > "${HOOK_PATH}/deactivate.bash" <<OUT
+before_deactivate 'echo "before"'
+after_deactivate 'echo "after"'
+OUT
+  export PYENV_VIRTUALENV_INIT=1
+  export PYENV_VIRTUAL_ENV="${PYENV_ROOT}/versions/venv"
+  export VIRTUAL_ENV="${PYENV_ROOT}/versions/venv"
+  export PYENV_ACTIVATE_SHELL=
+  stub pyenv-hooks "deactivate : echo '$HOOK_PATH'/deactivate.bash"
+
+  PYENV_SHELL="bash" run pyenv-sh-deactivate
+
+  assert_success
+  assert_output <<EOS
+before
+unset PYENV_VIRTUAL_ENV;
+unset VIRTUAL_ENV;
+if [ -n "\${_OLD_VIRTUAL_PATH:-}" ]; then
+  export PATH="\${_OLD_VIRTUAL_PATH}";
+  unset _OLD_VIRTUAL_PATH;
+fi;
+if [ -n "\${_OLD_VIRTUAL_PYTHONHOME:-}" ]; then
+  export PYTHONHOME="\${_OLD_VIRTUAL_PYTHONHOME}";
+  unset _OLD_VIRTUAL_PYTHONHOME;
+fi;
+if [ -n "\${_OLD_VIRTUAL_PS1:-}" ]; then
+  export PS1="\${_OLD_VIRTUAL_PS1}";
+  unset _OLD_VIRTUAL_PS1;
+fi;
+if declare -f deactivate 1>/dev/null 2>&1; then
+  unset -f deactivate;
+fi;
+after
+EOS
+
+  unstub pyenv-hooks
+}