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🐛 fix(activation): keep and restore the user's TCL_LIBRARY and TK_LIBRARY - #3234
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…RARY The PowerShell script's `deactivate -nondestructive`, which runs at the top of every activation, treated "no saved copy" as "we set this" and removed whatever TCL_LIBRARY and TK_LIBRARY the user had exported. On first activation there is never a saved copy, so any environment, with or without tcl, wiped the user's values, and the real deactivate then wiped them again instead of restoring. The fish script did the same, only for environments whose interpreter has tcl (the block is gated on the template value). bash had the opposite problem: it only saved a non-empty previous value and tested the saved copy with -n, so after activating an environment that does set tcl it could not tell "was unset" from "nothing saved" and left the environment's tcl path behind for good. Save the previous value unconditionally (empty or null when unset) whenever the script is about to replace it, and have deactivate restore or unset based on whether a saved copy exists at all. csh and batch already work this way and are unchanged. Add subprocess tests for bash, fish and PowerShell covering the interpreter with and without tcl, crossed with the variables set or unset beforehand.
csh ran deactivate before saving TCL_LIBRARY and TK_LIBRARY, and its unsetenv fallback removed user-set values on every activation. It now saves an empty value for an unset variable and unsets only when that saved value is empty. Instead of a new test per shell, ActivationTester prints TCL_LIBRARY and TK_LIBRARY before activation, while active and after deactivation. activation_python adds an environment whose scripts carry tcl paths, and activation_tester runs each shell with the user's values unset and set. activate.nu never sets the variables, so its tester expects them unchanged.
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Activation sets
TCL_LIBRARYandTK_LIBRARYto the interpreter's paths when it knows them, and saves the previousvalues for
deactivate. Four scripts get this wrong.PowerShell, fish and csh run
deactivateat the start of activation. With no saved copy, their TCL/TK branches removedthe variables, so a user-set
TCL_LIBRARYdisappeared on activation and stayed gone afterdeactivate. PowerShell andcsh did this for every environment, fish only when the interpreter has tcl. In PowerShell, setting
$env:TCL_LIBRARY = 'C:\tcl\lib\tcl8.6', then activating and deactivating, left$env:TCL_LIBRARYempty.bash saved a previous value only when it was non-empty and tested the saved copy with
-n. After activating anenvironment with tcl, it could not tell "was unset" from "nothing saved", so an unset
TCL_LIBRARYstayed at/usr/lib/tcl8.6afterdeactivate.All four scripts now save the previous value whenever they replace it, as an empty string or
$nullwhen it was unset.deactivateacts only when a saved copy exists (${var+x},set -q,Test-Path variable:,$?var), restoring anon-empty value and unsetting otherwise. batch already worked this way.
ActivationTesternow printsTCL_LIBRARYandTK_LIBRARYbefore activation, while active and after deactivation, soevery shell it drives checks them.
activation_pythonadds an environment whose scripts carry tcl paths: theinterpreter reports
tcl_libonly whenTCL_LIBRARYis set during its cached probe, so the fixture regenerates thescripts with
tcl_libandtk_libpatched.activation_testerruns each shell with the user's values unset and set.On
main, PowerShell and csh fail the set cases, fish fails set with tcl, and bash fails unset with tcl.activate.nunever sets these variables (itslet $new_envinsideifonly shadows the outer binding), so the nushelltester expects them unchanged. This PR leaves that as is.