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miller/internal/pkg/climain
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John Kerl 6b32e1f419
Reduce number of os.Exit callsites, part 1 of n (#1055) 
* neaten some uses of os.Exit

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2022-07-09 18:53:24 -04:00
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doc.go Standardize Go-package structure (#746) 2021-11-11 14:15:13 -05:00
mlrcli_mlrrc.go More Go-package restructuring (#748) 2021-11-12 12:49:55 -05:00
mlrcli_parse.go Reduce number of os.Exit callsites, part 1 of n (#1055) 2022-07-09 18:53:24 -04:00
mlrcli_shebang.go Reduce number of os.Exit callsites, part 1 of n (#1055) 2022-07-09 18:53:24 -04:00
README.md Standardize Go-package structure (#746) 2021-11-11 14:15:13 -05:00

README.md

Logic for parsing the Miller command line.

  • internal/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.
  • internal/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.