fix: Resolve flags on demand instead of mutating App.Flags, remove NoGlobalFlags - #14
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ChangesFlag resolution and command behavior
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The flag-resolution change avoids mutating caller-owned slices, but the current implementation still mishandles --version for nested applications and can carry subcommand mode into later reuse, causing incorrect version behavior. These bounded correctness issues should be fixed or explicitly accepted before merge. Sequence Diagram(s)sequenceDiagram
participant App.Run
participant App.resolveFlags
participant flagSet
participant normalizeFlags
App.Run->>App.resolveFlags: build effective application flags
App.resolveFlags-->>App.Run: return version, global, and help flags
App.Run->>flagSet: parse effective flags
App.Run->>normalizeFlags: normalize effective flags
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Inline comments:
In `@app.go`:
- Around line 463-464: Update RunAsSubcommand to invoke checkVersion after its
help handling, matching the ordering and behavior in App.Run, so nested
invocations of --version print the version and do not continue to the subcommand
action.
- Around line 462-468: Update App.resolveFlags in app.go and
Command.resolveFlags in command.go to prevent duplicate flag names or aliases
before passing flags to flagSet, either by rejecting or deduplicating them.
Ensure VersionFlag, GlobalFlags, and HelpFlag are checked, avoid collisions when
combining c.Flags with ctx.App.GlobalFlags, and preserve the NoGlobalFlags
opt-out behavior.
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App.Setup() appended GlobalFlags, HelpFlag and VersionFlag onto App.Flags, and Command.Run() likewise reassigned c.Flags. Mutating the user's own slice made the effective flag set depend on whether Setup() had run, and made repeated runs of the same App accumulate flags. Introduce App.resolveFlags() and reuse Command.resolveFlags() to compute the effective set at the point of use, leaving App.Flags and Command.Flags as the caller wrote them. Also removes Command.NoGlobalFlags: global flags are now resolved uniformly for every command. Note that the help output now lists --version before the global flags and --help last, matching the new resolution order; the example tests are updated accordingly.
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Actionable comments posted: 1
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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@app.go`:
- Line 313: Update RunAsSubcommand to save the existing runningAsSubcommand
value before setting it to true, then defer restoring that value so every return
path leaves the App state unchanged. Add a regression test that invokes
RunAsSubcommand followed by Run with --version and verifies the version flag
remains available.
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App.Setup() appended GlobalFlags, HelpFlag and VersionFlag onto App.Flags, and Command.Run() likewise reassigned c.Flags. Mutating the user's own slice made the effective flag set depend on whether Setup() had run, and made repeated runs of the same App accumulate flags.
Introduce App.resolveFlags() and reuse Command.resolveFlags() to compute the effective set at the point of use, leaving App.Flags and Command.Flags as the caller wrote them.
Also removes Command.NoGlobalFlags: global flags are now resolved uniformly for every command.
Note that the help output now lists --version before the global flags and --help last, matching the new resolution order; the example tests are updated accordingly.
Summary by CodeRabbit
Bug Fixes
Breaking Changes