Support setting envvars with 'export' commands

closes #32

CHANGELOG.rst

@@ -8,6 +8,8 @@ Features:
 
 * Add shell completion for bash, zsh, and fish (:issue:`3`).
 * Add "Did you mean" suggestions.
+* Support setting environment variables with ``export`` commands
+  (:issue:`32`). Thanks :user:`asmacdo` for the suggestion.
 
 Bug fixes:
 

doitlive/cli.py

@@ -2,6 +2,7 @@
 import functools
 import os
 import re
+import shlex
 import sys
 import textwrap
 from codecs import open
@@ -11,14 +12,14 @@
 from click import secho, style
 from click_didyoumean import DYMGroup
 
+from doitlive.__version__ import __version__
 from doitlive.compat import ensure_utf8
 from doitlive.exceptions import SessionError
 from doitlive.keyboard import (RETURNS, magicrun, magictype, run_command,
                                wait_for)
 from doitlive.python_consoles import PythonRecorderConsole, start_python_player
 from doitlive.styling import THEMES, echo, echo_prompt, format_prompt
 from doitlive.termutils import get_default_shell
-from doitlive.__version__ import __version__
 
 env = os.environ
 click_completion.init()
@@ -120,6 +121,7 @@ def run(commands, shell=None, prompt_template='default', speed=1,
     i = 0
     while i < len(commands):
         command = commands[i].strip()
+        command_as_list = shlex.split(command)
         i += 1
         if not command:
             continue
@@ -135,6 +137,14 @@ def run(commands, shell=None, prompt_template='default', speed=1,
                 comment = command.lstrip("#")
                 secho(comment, fg='yellow', bold=True)
             continue
+        # Handle 'export' commands by adding envvars to SessionState
+        elif command_as_list and command_as_list[0] == 'export':
+            magictype(command,
+                      prompt_template=state['prompt_template'],
+                      speed=state['speed'])
+            for envvar in command_as_list[1:]:
+                state.add_envvar(envvar)
+        # Handle ```python and ```ipython by running "player" shells
         elif shell_match:
             shell_name = shell_match.groups()[0].strip()
             py_commands = []

tests/sessions/export.session

@@ -0,0 +1,2 @@
+export NAME=Steve
+echo 'Hello' $NAME

tests/test_doitlive.py

@@ -155,6 +155,15 @@ def test_unset_envvar(self, runner):
         result = run_session(runner, 'unset.session', user_input)
         assert 'fortytwo' not in result.output
 
+    def test_export(self, runner):
+        user_input = ''.join([
+            random_string(len('export NAME=Steve')),
+            '\n',
+            random_string(len("echo 'Hello' $NAME"))
+        ])
+        result = run_session(runner, 'export.session', user_input)
+        assert 'Hello Steve' in result.output
+
 
 def test_themes_list(runner):
     result1 = runner.invoke(cli, ['themes'])