Silence cobra usage/error dump on failure (#31)#52
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Cobra prints the full usage and flags block to stderr on any RunE or flag-parse error. That clutters logs and buries the real message, breaking the "data on stdout, errors on stderr" contract: a stray flag like `--version` produced a screenful of usage text. Set SilenceUsage and SilenceErrors on the root command and print a single-line "Error: <msg>" to stderr from Execute instead. stdout stays data-only; stderr carries one concise line. Adds a regression test asserting no usage/command block is emitted on a flag-parse error. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
DTTerastar
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Verified locally: build, go vet, go test ./... all pass. Behavior confirmed — --version gives a single Error: unknown flag: --version on stderr with exit 1 and no usage block, while a bare invocation still prints help. Clean fix.
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Fixes #31.
Problem
Cobra prints the full usage/flags block to stderr on any
RunEor flag-parse error. This clutters logs and buries the real message, breaking the "data on stdout, errors on stderr" contract. For example, a stray--versionproduced a full screen of usage text and exit code 1.Fix
SilenceUsage: trueandSilenceErrors: trueonrootCmd.Error: <msg>to stderr fromExecute()ourselves.stdout stays data-only; stderr carries one concise line.
Behavior after fix
Tests
Adds
TestRootCmd_NoUsageDumpOnError, asserting neitherUsage:norAvailable Commands:is emitted on a flag-parse error.go test ./...andgo vet ./...pass.🤖 Generated with Claude Code