Fix methods defined with invalid encoding are not displayed in completion #1101
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ksaito422
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tompng
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Jun 14, 2025
| i.encode(Encoding.default_external) | ||
| rescue Encoding::UndefinedConversionError | ||
| warn "Warning: Invalid encoding in method name '#{i}'. can't be converted to the locale #{Encoding.default_external}." unless @encoding_warning_shown | ||
| @encoding_warning_shown = true |
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It's not possible to show a warning safely here. I think we can just silently ignore invalid ones.
tompng
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Jun 14, 2025
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| i.encode(Encoding.default_external) | ||
| rescue Encoding::UndefinedConversionError |
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Can you add this encode and rescue to IRB::TypeCompletor#completion_candidates?
It is the default completor when RUBY_VERSION >= '3.4'
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Summary
This PR fixes a crash in IRB's method completion when a completion candidate contains characters that cannot be converted to
Encoding.default_external.（#900）Problem
Currently, if a method or variable name includes characters incompatible with
Encoding.default_external, triggering method completion results in anEncoding::UndefinedConversionError, which crashes the entire IRB session. This leads to a poor user experience, as the session terminates unexpectedly and work can be lost.Solution
Instead of allowing the exception to crash the session, this change catches the encoding error and prints a warning message to stderr. To avoid flooding the console, this warning is displayed only once per session upon the first occurrence of the error.
This approach is preferable because it informs the user about the underlying encoding issue without abruptly ending their workflow.
Behavior Change