Allow default python binary for mkvenv to be set with AUTOSWITCH_DEFAULT_PYTHON

README.rst

@@ -235,6 +235,18 @@ export ``AUTOSWITCH_DEFAULTENV`` in your ``.zshrc`` file.
     export AUTOSWITCH_DEFAULTENV="mydefaultenv"
     antigen bundle MichaelAquilina/zsh-autoswitch-virtualenv
 
+**Setting a default python binary**
+
+You may specify a default python binary to use when creating virtualenvs
+by setting the value of ``AUTOSWITCH_DEFAULT_PYTHON``. For example:
+
+::
+
+    export AUTOSWITCH_DEFAULT_PYTHON="/usr/bin/python3"
+
+You may still override this default as usual by passing the --python parameter to
+the mkvenv command.
+
 **Set verbosity when changing environments**
 
 You can prevent verbose messages from being displayed when moving

autoswitch_virtualenv.plugin.zsh

@@ -180,10 +180,17 @@ function mkvenv()
 
         printf "Creating ${PURPLE}%s${NONE} virtualenv\n" "$venv_name"
 
-        if [[ ${@[(ie)--verbose]} -eq ${#@} ]]; then
-            virtualenv $@ "$(_virtual_env_dir)/$venv_name"
+        # Copy parameters variable so that we can mutate it
+        params=("${@[@]}")
+
+        if [[ -n "$AUTOSWITCH_DEFAULT_PYTHON" && ${params[(I)--python*]} -eq 0 ]]; then
+            params+="--python=$AUTOSWITCH_DEFAULT_PYTHON"
+        fi
+
+        if [[ ${params[(I)--verbose]} -eq 0 ]]; then
+            virtualenv $params "$(_virtual_env_dir)/$venv_name"
         else
-            virtualenv $@ "$(_virtual_env_dir)/$venv_name" > /dev/null
+            virtualenv $params "$(_virtual_env_dir)/$venv_name" > /dev/null
         fi
 
         printf "$venv_name\n" > ".venv"

tests/test_mkvenv.zunit

@@ -30,6 +30,53 @@
 
     assert $status equals 0
     assert "$TARGET/myproject/.venv" exists
+    # assert "$lines[1]" same_as "Creating \e[35mmyproject\e[0m virtualenv"
+
+    run cat "$TARGET/myproject/.venv"
+
+    assert $status equals 0
+    assert "$output" same_as "myproject"
+}
+
+@test 'mkvenv - uses default python if set and not specified' {
+    # mock virtualenv function to test its inputs
+    function virtualenv {
+        echo virtualenv $@
+    }
+
+    mkdir myproject
+    cd myproject
+    AUTOSWITCH_DEFAULT_PYTHON="python_foo"
+
+    run mkvenv
+
+    assert $status equals 0
+    assert "$TARGET/myproject/.venv" exists
+    # Assert mock output
+    assert "$lines[2]" same_as "virtualenv --python=python_foo $HOME/.virtualenvs/myproject"
+
+    run cat "$TARGET/myproject/.venv"
+
+    assert $status equals 0
+    assert "$output" same_as "myproject"
+}
+
+@test 'mkvenv - uses specified python if default set' {
+    # mock virtualenv function to test its inputs
+    function virtualenv {
+        echo virtualenv $@
+    }
+
+    mkdir myproject
+    cd myproject
+    AUTOSWITCH_DEFAULT_PYTHON="python_foo"
+
+    run mkvenv --python=python_bar
+
+    assert $status equals 0
+    assert "$TARGET/myproject/.venv" exists
+    # Assert mock output
+    assert "$lines[2]" same_as "virtualenv --python=python_bar $HOME/.virtualenvs/myproject"
 
     run cat "$TARGET/myproject/.venv"