drop ksh support

Fixes python-virtualenvwrapper#11

Sem-Ver: api-break

Author: dhellmann

README.txt

@@ -47,7 +47,7 @@ Supported Shells
 ================
 
 virtualenvwrapper is a set of shell *functions* defined in Bourne
-shell compatible syntax.  It is tested under ``bash``, ``ksh``, and
+shell compatible syntax.  It is tested under ``bash`` and
 ``zsh``.  It may work with other shells, so if you find that it does
 work with a shell not listed here please let us know by opening a
 `ticket on GitHub

docs/source/install.rst

@@ -12,7 +12,6 @@ shell compatible syntax.  Its automated tests run under these
 shells on OS X and Linux:
 
 * ``bash``
-* ``ksh``
 * ``zsh``
 
 It may work with other shells, so if you find that it does work with a

docs/source/plugins.rst

@@ -150,7 +150,7 @@ shell process.
 .. warning::
 
     virtualenvwrapper works under several shells with slightly
-    different syntax (bash, sh, zsh, ksh).  Take this portability into
+    different syntax (bash, sh, zsh).  Take this portability into
     account when defining source hooks.  Sticking to the simplest
     possible syntax usually avoids problems, but there may be cases
     where examining the ``SHELL`` environment variable to generate

tests/run_tests

@@ -61,7 +61,6 @@ do
     echo "  SHELL=$SHELL"
     echo "  BASH_VERSION=$BASH_VERSION"
     echo "  ZSH_VERSION=$ZSH_VERSION"
-    echo "  KSH_VERSION=$KSH_VERSION"
     echo "  virtualenv=$(which virtualenv)"
     echo "  test_shell_opts=$test_shell_opts"
     echo "  ZSH=$ZSH_NAME $ZSH_EVAL_CONTEXT"

tests/test_dir_stack.sh

@@ -29,7 +29,6 @@ tearDown() {
 }
 
 test_ticket_101 () {
-    [ ! -z "$KSH_VERSION" ] && echo "Skipping test under ksh"  && return 0
     mkvirtualenv some_env
     deactivate
     cd "$WORKON_HOME/start_here"

tox.ini

@@ -14,7 +14,6 @@ setenv =
 allowlist_externals =
     bash
     zsh
-    ksh
 
 [testenv:fast]
 setenv =
@@ -32,12 +31,6 @@ setenv =
   test_shell_opts = -o shwordsplit
 commands =  zsh -o shwordsplit ./tests/run_tests {envdir} []
 
-[testenv:ksh]
-basepython=python2.7
-setenv =
-  SHELL = /bin/ksh
-commands =  ksh ./tests/run_tests {envdir} []
-
 [testenv:docs]
 deps =
   -r{toxinidir}/requirements.txt

virtualenvwrapper.sh

@@ -121,20 +121,16 @@ fi
 # alias or even a shell function. Under bash and zsh, "builtin" forces
 # the use of a command that is part of the shell itself instead of an
 # alias, function, or external command, while "command" does something
-# similar but allows external commands. Under ksh "builtin" registers
-# a new command from a shared library, but "command" will pick up
-# existing builtin commands. We need to use a builtin for cd because
-# we are trying to change the state of the current shell, so we use
-# "builtin" for bash and zsh but "command" under ksh.
+# similar but allows external commands. We need to use a builtin for
+# cd because we are trying to change the state of the current shell,
+# so we use "builtin".
 function virtualenvwrapper_cd {
     if [ -n "${BASH:-}" ]
     then
         builtin \cd "$@"
     elif [ -n "${ZSH_VERSION:-}" ]
     then
         builtin \cd -q "$@"
-    else
-        command \cd "$@"
     fi
 }