feat: add bash completion for p11* tools

[mdevolde]

This PR adds bash completion support for several p11* CLI tools.

Features

• Shared logic in completion/p11-common
• Specific completions for: p11cat, p11cp, p11kcv, p11ls, p11more, p11mv, p11od, p11setattr
• Supports PKCS11LIB, PKCS11SLOT, PKCS11PASSWORD as environment fallback
• Documented usage, environment handling, and limitations

Makefile

• Adds completion scripts to EXTRA_DIST
• Installs them to ${datadir}/bash-completion/completions

Limitations

• Does not support inline env variables (e.g. PKCS11LIB=... p11cat)
• Zsh is not yet supported, could be addressed in a later contribution

[Copilot]

Pull Request Overview

This PR adds Bash autocompletion support for various p11* CLI tools by introducing a shared common script and individual completion scripts, and updating the Makefile.am to install them.

• Introduce completion/p11-common with reusable parsing and completion functions.
• Add dedicated completion scripts for p11cat, p11cp, p11kcv, p11ls, p11more, p11mv, p11od, and p11setattr.
• Update Makefile.am to include these scripts in EXTRA_DIST and install them under bash-completion/completions.

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
completion/p11-common	Shared functions for parsing -l, -s, -p and completing filters
completion/p11cat	Autocompletion for p11cat
completion/p11cp	Autocompletion for p11cp
completion/p11kcv	Autocompletion for p11kcv
completion/p11ls	Autocompletion for p11ls
completion/p11more	Autocompletion for p11more
completion/p11mv	Autocompletion for p11mv
completion/p11od	Autocompletion for p11od
completion/p11setattr	Autocompletion for p11setattr
Makefile.am	Registers and installs completion scripts

Comments suppressed due to low confidence (2)

completion/p11mv:3

• The comment refers to p11cp but this is the p11mv completion script; update it to p11mv.

# Bash autocompletion for `p11cp`.

completion/p11-common:60

• Consider adding unit or integration tests for __p11_complete_filters to ensure completion logic works correctly across different argument combinations.

__p11_complete_filters() {

[keldonin]

It would be great to have support for slot selection. That would require to modify p11slotinfo and add an option to enumerate slots and token, for completion.

[keldonin]

Good stuff.

A few requests:

• It should support ZSH as well
• If possible, infer slots as well - that would require to adapt p11slotinfoto yield a list of slots and token, for completion.