It seems macOS normalizes UTF-8 differently from everyone else in file
names (I think base character + composing instead of precomposed
codepoint). That might affect PWD.
For environment variables, even if most sensible platforms should have
adopted UTF-8 by now, I wouldn't be surprised if there's no official
encoding whatsoever (i.e. they're just bytes with a 0 at the end…)
On 17 April 2018 at 09:36, Sven Van Caekenberghe <s...@stfx.eu> wrote:
> Hi,
>
> The dictionary
>
> OSPlatform current environment
>
> contains a copy of the OS's environment variables (more correctly of the
> VM process), as key/value pairs.
>
> These are obtained via the following system calls:
>
> on macOS & *nix
>
> LIBC environ
>
> on Windows
>
> KERNEL32 GetEnvironmentStrings
>
> It is however a bit unclear how these are encoded. On macOS & *nix that
> seems to be UTF8, on Windows there are some reports that it appears to be
> Latin1 - but both might be locale specific, I don't know either way.
>
> Does anyone know for sure ?
>
> I furthermore think that OSEnvironment and its subclasses, who do this
> call, should be responsible for decoding the C strings into proper Pharo
> strings, and not leave that responsibility to its users.
>
> Fundamentally, in the following, the decoding is still not done correctly
> and that is wrong/confusing IMHO.
>
> $ FOO=benoît ./pharo Pharo.image eval 'OSEnvironment current associations'
> {'TERM_PROGRAM'->'Apple_Terminal'. 'TERM'->'xterm-256color'.
> 'SHELL'->'/bin/bash'. 'TMPDIR'->'/var/folders/sy/
> sndrtj9j1tq06j0lfnshmrl80000gn/T/'. 'FOO'->'benoît'.
> 'Apple_PubSub_Socket_Render'->'/private/tmp/com.apple.launchd.uWk7pivcLT/Render'.
> 'TERM_PROGRAM_VERSION'->'404'.
> 'TERM_SESSION_ID'->'845BECCD-0AB0-4686-B7F9-3A0FF84BDCB7'.
> 'USER'->'sven'.
> 'SSH_AUTH_SOCK'->'/private/tmp/com.apple.launchd.y5oCwdUyaG/Listeners'.
> 'PATH'->'/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/texbin:/opt/X11/bin'.
> 'PWD'->'/tmp/benoît'. 'XPC_FLAGS'->'0x0'. 'XPC_SERVICE_NAME'->'0'.
> 'HOME'->'/Users/sven'. 'SHLVL'->'2'. 'LOGNAME'->'sven'.
> 'LC_CTYPE'->'UTF-8'. 'DISPLAY'->'/private/tmp/com.
> apple.launchd.lsgASYFiWW/org.macosforge.xquartz:0'.
> 'SECURITYSESSIONID'->'186a9'. 'OLDPWD'->'/tmp/benoît'.
> '_'->'/tmp/benoît/pharo-vm/Pharo.app/Contents/MacOS/Pharo'.
> '__CF_USER_TEXT_ENCODING'->'0x1F5:0x0:0x0'}
>
> Of course, if we change this, we will need to fix callers.
>
> Opinions ?
>
> Sven
>
> PS: Furthermore, I note that there is a subtle difference in how $FOO and
> $PWD in the above are UTF-8 encoded. In the former, normalisation was done,
> in the latter not. Maybe that could lead to problems (when
> comparing/composing them). This is a difficult/complex subject (
> https://medium.com/concerning-pharo/an-implementation-of-unicode-
> normalization-7c6719068f43).
>
>
>
>
--
Damien Pollet
type less, do more [ | ] http://people.untyped.org/damien.pollet
