Clarify error message for missing plugin versions #3651
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When using buf generate, provide specific error messages based on whether the
plugin is unknown, or if it is just the version that is unknown.
For a valid plugin with non-existent version (e.g., v0.4.1 instead of v0.4.0):
"unknown version v0.4.1 for plugin community/neoeinstein-prost. The latest
version is v0.4.0. Check https://buf.build/community/neoeinstein-prost for
other available versions"
For a completely non-existent plugin (e.g., a typo like "proust" instead of "prost"):
"unknown plugin community/neoeinstein-proust, check https://buf.build/plugins for
the list of available plugins"
This provides more clarity to users about whether they need to fix a version
number or if they have a completely incorrect plugin reference.
Fixes #3650
🤖 Generated with Claude Code
Co-Authored-By: Claude [email protected]