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fix(complete): treat completion candidates as text and keep top-level completers out of mounts - #1581

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fix/completion-hardening
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fix/completion-hardening

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@jdx jdx commented Oct 23, 2026 •

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https://entire.com/gh/jdx/usage/trails/117

Completion scripts generated by usage could run code taken from completion candidates, and a mounted command could pick up completers by name from the spec that mounts it. This matters for tools like mise, whose completion candidates can come from project files.

What changes

  • zsh: the extensions directive was spliced straight into the _files -g pattern, and zsh runs code in glob qualifiers. An extensions line such as x)(e.touch\ pwned. ran touch pwned. The script now builds the pattern only from plain extension names (letters, digits, _ . + -) and falls back to plain _files when none remain. This also fixes a bug where a single extension produced *.(toml), which zsh read as glob qualifiers and which matched nothing; one extension is now *.toml.
  • fish: extensions are matched as a literal suffix, so a * in an extension no longer matches every file.
  • bash (usage generate completion bash): candidates were passed through compgen -W, which expands them as shell input, so a run= completer printing $(touch pwned) ran that command on Tab. The completion-init handler also globbed candidates through an unquoted $(…). Both now read one candidate per line as plain text. A candidate containing a space is now a single entry instead of being split in two.
  • Completers in mounted commands: a command brought in by mount now uses only the completers it declares itself, in its own complete nodes or inside its arg nodes. Before, a mounted command's argument named like a top-level completer (for example <tool>) inherited that completer, even over one the mounted command declared. Specs without mounts behave as before.

Compatibility

  • Installed completion files need regenerating to pick up the script changes.
  • bash candidates that contain spaces now stay whole.

Validation

New tests cover each change and fail without it: zsh_never_turns_an_extension_into_glob_syntax, fish_matches_extensions_literally, mounted_commands_do_not_inherit_top_level_completers_by_name, complete_word_mounted_args_do_not_inherit_top_level_completers and test_bash_completion_keeps_candidates_literal. cargo test --workspace passes, with the bash integration tests run against bash-completion 2.11. mise run render && mise run gen-shadow leaves no diff.

Local cargo clippy --workspace --all-features --all-targets -- -D warnings fails on benches/shadows/pitchfork/src/lib.rs:537 ("duplicated attribute") with clippy 0.1.100. This branch doesn't touch that file, and clippy is clean with that crate excluded.

AI-assisted — Tool: Claude Code; model: anthropic/claude-opus-5-5; version: 2.1.308.

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Summary by CodeRabbit

  • Bug Fixes

    • Shell completions now handle special characters in candidate names and file extensions literally, preventing unintended matches or shell expansion.
    • Mounted commands use their own completion definitions instead of inheriting top-level completions from the mounting specification, while retaining their own command and argument completions.
    • Flag-value completion uses the definition belonging to the command that offers the flag; mounting CLI global flags remain available within mounted commands.
    • Zsh falls back to unrestricted file completion when no usable extensions are available.
    • Bash preserves completion candidates as literal text.
  • Documentation

    • Clarified how completion definitions apply to mounted commands.

jdx and others added 3 commits October 23, 2026 12:30
The generated zsh script turned the extensions line into the pattern it
hands `_files -g`, which zsh expands as a glob with qualifiers. Text such
as `x)(e.touch\ f.` in that line therefore ran as code for every file
the glob reached. The script now keeps only extensions made of letters,
digits, `_`, `.`, `+` and `-`, falls back to unfiltered paths when none
remain, and writes a single extension bare: `*.(toml)` was read as glob
qualifiers and matched nothing.

fish compared extensions with `string match "*.$extension"`, so a `*` in
one widened the filter. It now tests the suffix literally. bash already
compared quoted text.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A `complete` node is looked up by argument name, top level first, so an
argument of a mounted command (a task, say) named `<tool>` or `<prefix>`
was completed by the mounting spec's `complete "tool"`. That completer
even outranked one the mounted command declared for itself.

A mounted command now consults only the completers it declares, in its
own `complete` nodes or inside its `arg` nodes. The host's own commands,
however deeply nested, keep the top-level lookup unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The bash script `usage generate completion bash` writes passed every
candidate through `compgen -W`, which expands each word as shell input.
A candidate printed by a `run=` completer, such as `$(cmd)` or a
backquoted command, ran at <Tab>, and `*` became the files in the
working directory. The `completion-init` handler split an unquoted
`$(...)`, which globbed candidates the same way.

Both now read complete-word's output one line at a time into COMPREPLY.
The per-binary script keeps the prefix filter `compgen` applied, as a
literal string comparison.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 Walkthrough

This change updates Zsh and Fish extension completion, preserves Bash candidates as literal text, and changes completer selection for mounted commands and flags. Regression tests cover these behaviors, and reference documentation describes mounted-command completion rules.

Changes: Shell extension matching

Layer / File(s) Summary
Filter shell extension completions
cli/assets/completions/_usage, argv/src/script.rs, cli/assets/completions/usage.fish, argv/tests/scripts.rs
Zsh filters extension names before building patterns and uses unrestricted file completion when none are safe. Fish matches literal suffixes. Tests check matching behavior and fallback.

Bash candidate handling

Layer / File(s) Summary
Preserve Bash completion candidates
lib/src/complete/bash.rs, cli/tests/shell_completions_integration.rs
Both Bash handlers read nonempty candidates line by line into COMPREPLY. The integration test checks that shell-special characters remain literal.

Mounted-command completers

Layer / File(s) Summary
Track mounted flag ownership
lib/src/parse.rs
Parsing records mounted flag identities and propagates ownership through flag merges. Tests check ownership for host and mounted flags.
Limit completer lookup for mounted commands
lib/src/spec/mod.rs, docs/spec/reference/cmd.md, docs/spec/reference/complete.md
Mounted commands skip spec-level named completers. View materialization handles carried-global completers and retains mounted-command completers. Tests and reference documentation describe the behavior.
Resolve mounted flag-value completion
cli/src/cli/complete_word.rs, cli/tests/complete_word.rs
Flag-value completion selects the command that owns the flag. Tests cover mounted arguments, nested commands, and redeclared flags.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Suggested reviewers: jambalaya56562

Merge Risk: ⚪ Minimal · up to 2a53e

Host flag completion remains available inside mounted commands without leaking host completers to mounted arguments. No actionable merge-blocking issue remains after normal checks.

Pre-merge checks: Passed 5
Check name Status Explanation
Description Check Passed Check skipped - CodeRabbit’s high-level summary is enabled.
Title check Passed The title names the two main changes: candidates are treated as literal text, and top-level completers are kept out of mounted commands. Both appear in the raw summary and the PR objectives. It is a s…
Docstring Coverage Passed Docstring coverage is 82.35% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 34 functions across 8 files.
Linked Issues check Passed Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check Passed Check skipped because no linked issues were found for this pull request.
Full details: Title check

Explanation

The title names the two main changes: candidates are treated as literal text, and top-level completers are kept out of mounted commands. Both appear in the raw summary and the PR objectives. It is a single, specific sentence. It does not cover the zsh and fish extension-pattern hardening, but it does not need to cover every detail.

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RetriggerView in GreptileConfidence Score: 5/5

[Medium impact] The PR appears safe to merge; no new blocking issues were found.

Summary

The PR keeps shell completion candidates as text and separates mounted commands from the host’s named completers.

  • Shell completion keeps candidate text literal across Bash, zsh, and fish.
  • Mounted commands use completion definitions from the command that owns each value.

Reviews (7) · Last reviewed commit: "fix(complete): record at parse time whic..." · Reviewed by Greptile

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Actionable comments posted: 2


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @lib/src/spec/mod.rs:
- Around line 399-400: Update for_view so promoting a mounted command does not
move its local named completers out of promoted.complete into spec.complete;
preserve them on the promoted command so the mounted branch can retrieve them
through cmd.complete.
- Around line 399-400: Preserve `SpecCommand::mounted` provenance when a spec is
serialized to KDL and parsed again, so `Spec::resolve_mount_outputs` continues
to enforce mounted completion lookup boundaries after the round trip. Update the
KDL serialization and parsing paths to retain and restore this state; leave the
normal direct-spec completion path unchanged.

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Comment thread lib/src/spec/mod.rs
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Instruction counts

benchmark trend instructions Δ wall (min) Δ
markdown ▂▂▂▃▁▂▂▃▂▂▃▂▂▂▃▂▁▂█ 266,429,517 → 266,926,454 +0.19% 47.12 → 47.42ms +0.63%
startup ▁▁▂▂▂▂▂▂▄▂▂▂▂▅▅▅▅▁█ 1,010,445 → 1,019,606 +0.91% 1.37 → 1.35ms -1.57%

No instruction-count regression above 1%.

Only instruction counts gate. Wall clock is shown for context — on identical hardware it moves 4-20% run to run.

Measured by tak — instruction-counted CLI benchmarks, stored in this repository's git notes.

Shadow comparison

Parsing mise use -g node@20 against a shadow of mise's committed spec.
Reported, not gated: the shadow grows as the derive learns to express more, so
what to watch is the ratio rather than either column.

framework stripped binary, bytes
usage 1249896
bpaf 2494640
clap 3100904
framework instructions, cold parse vs usage
usage 8295 —
clap 6313736 761x
bpaf 21909300 2641x
                                              min       p01       p10    median
usage-rs: argv -> struct                      739       750       756       760  ns
clap: build tree + parse -> struct        1232432   1234264   1243147   1262255  ns
bpaf: build parser + parse -> struct      3429474   3429474   3456512   3484030  ns

usage: argv -> struct                             822 ns      0.82 µs
clap: build tree + parse -> struct            1257945 ns   1257.94 µs
clap: parse -> struct, tree reused              49787 ns     49.79 µs
clap: build tree only                          747506 ns    747.51 µs

2a53ef9b86b0 vs d1bc575bf276 · measured on the runner, not pushed to the history.

jdx and others added 2 commits October 23, 2026 13:00
`Spec::for_view` moves the promoted command's own named completers, and
those of the globals it carries, to the materialized spec's top level.
A mounted command skips the top level when it looks up a completer, so
a view whose root was a mounted command lost all of them. They now stay
on the promoted command when it is mounted. Written out as KDL, both
places are the same top-level `complete` nodes, so the emitted spec is
unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The mounted-completers test wrote the fixture's absolute path into a KDL
string. On Windows its backslashes are KDL escapes, so the spec failed to
parse. The mount now reads the fixture by its file name, from the
directory completion runs in.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Comment thread lib/src/spec/mod.rs Outdated
@jdx

jdx commented Oct 23, 2026

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On the KDL round-trip point from the review summary: not changed. SpecCommand::mounted is runtime-only state set by resolve_mount_outputs, not spec syntax. Normal paths write unresolved specs, whose mount nodes are re-resolved on load, so the boundary holds. The parser's existing rule for hiding host flags inside mounted commands has the same runtime-only scope. Persisting it would mean adding a mounted property to the spec format, which is out of scope here.

🤖 Addressed by Claude Code

When a view promotes a mounted command, the completers of the global
flags it carries went into the command's own completer map. A carried
`--pick <tool>` then lent the host's `tool` completer to the mounted
command's `<tool>` argument, which declares none. Each carried completer
now goes on its flag's argument instead. A completer the promoted command
declares under the same name still wins, as it does for other views.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Caution

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⚠️ Outside diff range comments (1)

🟡 Minor · Keep host global flag completers for mounted commands. · mod.rs:399-400

lib/src/spec/mod.rs:399-400
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win

Keep host global flag completers for mounted commands.

Completing a host global flag's value inside a mounted command, such as ex run bare --pick <TAB>, no longer offers the host's top-level completer. The mounted-command branch of Spec::completer returns only the mounted command's own completers. The host completer that the carried flag needs is reached only through the for_view path, and ex is not a view program here.

The host completer is needed for the flag value, but the positional <tool> must not receive it. Resolve host global flag values through the host's top-level completers in the flag-value path, and leave the mounted-positional rule in Spec::completer unchanged. Add a test that completes the flag value through the canonical spec, not only through for_view("bare").

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Review comment at @lib/src/spec/mod.rs around lines 399 - 400:
Update the flag-value completion path in Spec so mounted commands can resolve
carried host-global flags through the host’s top-level completers; keep the
mounted-positional behavior in Spec::completer unchanged. Add a test that
completes the flag value through the canonical spec rather than only through
for_view("bare").

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Outside diff comments:
Review comments at @lib/src/spec/mod.rs:
- Around line 399-400: Update the flag-value completion path in Spec so mounted
commands can resolve carried host-global flags through the host’s top-level
completers; keep the mounted-positional behavior in Spec::completer unchanged.
Add a test that completes the flag value through the canonical spec rather than
only through for_view("bare").

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The parser still binds a flag of the mounting CLI typed inside a mounted
command, as in `ex run task --pick <TAB>`. Its value was completed from
the mounted command, which no longer reads the mounting spec's top-level
completers, so the host's `complete "tool"` stopped answering for it.
A flag the mounted program does not declare is now completed from the
nearest command above the mount. Arguments of the mounted command still
do not inherit the host's completers.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@jdx

jdx commented Oct 23, 2026

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Re the outside-diff point in review 5628736669 (host global flag completers in mounted commands): fixed in 51d9de4. The value of a host flag the mounted program doesn't declare (e.g. ex run plain --pick <TAB>) is again completed from the nearest command above the mount, while a mounted positional <tool> still gets no host completer. The test covers both halves.

🤖 Addressed by Claude Code

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Actionable comments posted: 1


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @cli/src/cli/complete_word.rs:
- Line 1147: Update the offered-flag ownership check in the completion path to
match the pending flag’s parsed spelling rather than only flag.name, so a
host-only alias such as -p remains owned by the host when a mounted command
declares the same name. Add a regression test covering the host-only -p alias.

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Comment thread cli/src/cli/complete_word.rs Outdated
Deciding whether a flag awaiting its value inside a mounted command was
the host's compared names only. A mounted command that re-declares
`--pick` has a flag of the same name as the host's `-p --pick`, so the
host's `-p`, which still binds the host's flag, was completed from the
mounted command without the host's completers. Ownership now follows
the spellings that reach that exact declaration: the flag is the
mounted program's when completion offers one of them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Comment thread cli/src/cli/complete_word.rs Outdated
Ownership of a flag awaiting its value inside a mounted command was
read off its spellings: if completion offered any spelling that reached
it, the flag counted as the mounted program's. A nested mounted command
that declares `-p --other` still has the parser bind the host's
`-p --pick`, so `ex run outer inner -p <TAB>` and `--pick <TAB>` lost
the host's completer. The flag is now the mounted program's only when
one of its commands, from the mount boundary down, declares exactly the
flag the parser bound.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Comment thread cli/src/cli/complete_word.rs Outdated
…lared

Completion decided whether a flag awaiting its value inside a mounted
command was the host's by matching it against declarations after the
fact. The parser merges, re-declares and shadows flags on its way down,
so a merged flag, such as a child's `-p --pick` folded into a mounted
parent's global `--pick`, matched no declaration and was taken for the
host's.

The parser now records provenance as it merges each command's flags. A
flag a mounted command declares, or a root flag a mount merges into the
command it sits on, belongs to the mounted program. A flag built by
merging a re-declaration into an inherited global belongs to whoever
owned that global. `ParseOutput::is_mounted_flag` exposes this, and
complete-word uses it, so ownership follows the parse for every alias,
merge and shadowing case.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@jdx
jdx merged commit fa9a9c4 into main Oct 23, 2026
14 checks passed
@jdx
jdx deleted the fix/completion-hardening branch October 23, 2026 14:20
mise-en-dev added a commit that referenced this pull request Oct 24, 2026
<!-- entire-trail-link-start -->
https://entire.com/gh/jdx/usage/trails/115
<!-- entire-trail-link-end -->

### 🐛 Bug Fixes

- **(complete)** treat completion candidates as text and keep top-level
completers out of mounts by [@jdx](https://github.com/jdx) in
[#1581](#1581)

### 📦️ Dependency Updates

- lock file maintenance by
[@renovate[bot]](https://github.com/renovate[bot]) in
[#1578](#1578)
- update jdx/packslip action to v1.8.0 by
[@renovate[bot]](https://github.com/renovate[bot]) in
[#1580](#1580)
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