miller/pkg/climain
John Kerl d56eafff97
Convert if/else-if chains to typed switch statements (staticcheck QF1003) (#2112)
Replaces 100+ if/else-if chains on a single variable with tagged switch
statements across 72 files. The bulk are transformer option-parsing loops
(switch on opt string), plus a handful of value-dispatch sites in mlrval,
dsl/cst, repl, lib, auxents, and bifs. One case (surv.go) required a
labeled break to preserve the loop-exit behavior of the original else branch.

Fixes staticcheck QF1003 findings.

Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
2026-06-28 18:27:42 -04:00
..
doc.go Export library code in pkg/ (#1391) 2023-09-10 17:15:13 -04:00
mlrcli_mlrrc.go Next batch of lint fixes (#2108) 2026-06-28 17:36:36 -04:00
mlrcli_parse.go Shell tab-completion for bash and zsh (#2096) 2026-06-21 12:47:54 -04:00
mlrcli_shebang.go Convert if/else-if chains to typed switch statements (staticcheck QF1003) (#2112) 2026-06-28 18:27:42 -04:00
README.md Export library code in pkg/ (#1391) 2023-09-10 17:15:13 -04:00

Logic for parsing the Miller command line.

  • pkg/climain is the flag-parsing logic for supporting Miller's command-line interface. When you type something like mlr --icsv --ojson put '$sum = $a + $b' then filter '$sum > 1000' myfile.csv, it's the CLI parser which makes it possible for Miller to construct a CSV record-reader, a transformer chain of put then filter, and a JSON record-writer.
  • pkg/cli contains datatypes for the CLI-parser, which was split out to avoid a Go package-import cycle.
  • I don't use the Go flag package. The flag package is quite fine; Miller's command-line processing is multi-purpose between serving CLI needs per se as well as for manpage/docfile generation, and I found it simplest to roll my own command-line handling here. More importantly, some Miller verbs such as sort take flags more than once -- mlr sort -f field1 -n field2 -f field3 -- which is not supported by the flag package.