Re: Re: Re: [PATCH 0/4] Add import builtin

[Phi Debian]

On Sat, May 4, 2024 at 4:44 AM Matheus Afonso Martins Moreira <
matheus@matheusmoreira.com> wrote:

>
> By "library system" I just mean the exact mechanism through which
> bash will load a "library". By "library", I mean ordinary scripts
> whose purpose is to collect related functions and variables
> for reuse by other scripts or interactive bash users.
>

May be that's why the term 'library' is not very well suitable as there are
other ways to load functions and variables in a shell context, i.e shared
libraries/objets dynamic builtins, so the 'import got to cover all of none.
In this case the import would find the shared libs in the restricted path
IMPORT_PATH along with the scripts, and then a 'library' could either be
text script or binary .so a.out.

Sounds more like a pandora box :-)



> By introducing the "module/library system" I want to do the following:
>
>   1. Add a builtin primitive that can be used to load libraries
>   2. Establish a convention for where bash will look for libraries
>   3. Separate the libraries from the commands/executables
>

If its all that simple may this 3 liners to stick in your.rc file or hide
it in yet another . findable script

shopt -s expand_aliases # Some may dislike this
xyz_import='for xyz in ${XYZ_IMPORT_PATH//:/\/$1 }/$1;do xyz=$(realpath -q
$xyz);[ -r "$xyz" ]&&. $xyz&&return;done'
alias xyz_import='source /dev/stdin <<< "$xyz_import"'

1. It create a new primitive (well a command in shell parser vocable)
xyz_import
2. It Establish a convention for where bash will look for libraries
XYZ_IMPORT_PATH
3. Separate the libraries from the commands/executables by looking in the
$XYZ_IMPORT_PATH dir set only

Murphy's law
------------
Note the I namespaced all this with xyz/XYZ, change for your taste, but
beware of other 'import'

While testing this I discover (and forgot) that I installed the
'imagemagick' package (linux debian) which in turn setup an alternative
path on 'import'

$ ll /usr/bin/import
lrwxrwxrwx 1 root root 24 Feb 26 07:43 /usr/bin/import ->
/etc/alternatives/import

$ ll /etc/alternatives/import
lrwxrwxrwx 1 root root 23 Feb 26 07:43 /etc/alternatives/import ->
/usr/bin/import-im6.q16

So I guess it is wise to stay away from 'import' name.