The uniq verb outputs only the group-by columns, and issue #1075 asks
for a way to deduplicate on some fields while keeping the rest. Miller
already supports this via "head -n 1 -g", but that wasn't discoverable
from uniq's help text or its reference-verbs section. Add a note to
"mlr uniq --help" and a short recipe (with live examples) to the uniq
section of the verbs reference, and regenerate the derived man page,
docs, and CLI-help golden files.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
With multiple regexes, 'mlr reorder -r' previously emitted all matched
fields in record order, ignoring the order the regexes were given. Now
matched fields are grouped by regex-list order (first regex's matches
first, then the second's, etc.); within each group, fields keep their
record order. A field matching multiple regexes is claimed by the first
one. This makes 'reorder -r' consistent with 'cut -orf' and satisfies
the original request in #1325: -r '^YYY,^XXX' puts YYY-prefixed fields
first, then XXX-prefixed fields, then the rest. Applies to -e, -b, and
-a modes as well.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
The summary verb's field_type column shows values like "string-int" or
"empty-string" for columns containing values of mixed inferred types:
all types encountered across records are printed, hyphen-joined, in the
order first encountered. Add a note to the verb's help text explaining
this, and regenerate the man page, docs, and golden test output.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
The join verb's help text listed only '-i {one of csv,dkvp,nidx,pprint,xtab}'
for overriding the left-file input format, but the verb also accepts the
--icsv/--ijson-style main-flag shorthands (and formats beyond the five
listed, e.g. json and tsv), since unrecognized verb flags fall through to
the main flag table. Update the usage text to say so, and regenerate the
man page and docs content that embed this help output.
Fixes#444.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
The uniq verb writes its group-by fields in the order they are named
with -g or -f, not in the order they appear in the input records
(unlike cut, which preserves input order unless -o is given). Per
discussion on #962, document this in the verb help text rather than
change long-standing output ordering. Regenerate the man page and the
docs pages which embed the verb help.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
One output record per input field: types seen with counts, occurrence
count, null count, cardinality, min/max, and -- for fields within the
-n/--max-values cap -- the complete distinct-value list in first-seen
order. `mlr --ojson describe` is the machine-readable form; nested
types/values flatten in tabular formats.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Lets an agent type-check a DSL expression before spending a full input
pass. `mlr put --explain '...'` (and filter) runs the existing
parse -> ValidateAST -> CST build -> Resolve path, then:
- valid: prints "mlr {put,filter}: DSL expression is valid." and exits 0
- invalid: returns the build error up the normal path, so --errors-json
emits a structured document; exits 1
- -W with fatal warnings: reports and exits 1
The gate lives in the pass-two constructor, before any input file is
opened, so no input stream is read (verified with a nonexistent input
file still validating OK).
Also categorize bare "parse error: ..." messages from the DSL parser as
kind "dsl-parse-error" rather than "generic" (climain/errors_json.go),
so --explain --errors-json gives an agent a useful error kind. The CSV
reader's "parse error on line ..." is stream-time and never reaches this
command-line-parse categorizer.
Tests: dsl-explain/0001-0004 regression cases (valid put/filter, invalid
plain, invalid --errors-json) and categorize unit tests. Regenerated
verb docs, manpage, and the help usage-verbs golden case.
The older -X ("exit after parsing") still exits 0 even on a parse error;
left as-is since --explain is the correct validation path.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
* Tier-2 structured verb options: OptionSpec, initial migration (#2098)
PR 3 of the AI-friendly roadmap (plans/plan-2098-llm.md).
Infrastructure:
- Add OptionSpec{Flag,Arg,Type,Desc,Repeatable,Values} to
pkg/transformers/aaa_record_transformer.go alongside TransformerSetup.
Type is one of: bool, string, int, float, csv-list, regex, filename,
format, enum. For type=="enum", Values lists the valid choices.
- Add Options []OptionSpec to TransformerSetup (nil = not yet migrated).
- Emit Options in VerbInfoForJSON (omitempty so unmigrated verbs stay
backward-compatible; agents check key presence for Tier-2 availability).
UsageText is always present as the Tier-1 prose fallback.
- Add VerbOptionsNilCheck() in aaa_verb_options_check.go: progress report
of migrated vs. unmigrated verbs, analogous to FLAG_TABLE.NilCheck().
- Wire verb-options-nil-check into mlr help (internal/docgen section).
Initial migration (5/70 verbs):
- nothing: empty Options (no verb-specific options, explicitly migrated)
- cat: -n (bool), -N (string), -g (csv-list), --filename, --filenum (bool)
- head: -g (csv-list), -n (int)
- tail: -g (csv-list), -n (int)
- tee: -a, -p (bool)
Tests:
- 5 new unit tests in aaa_transformer_json_test.go covering migrated/
unmigrated paths, field population, JSON round-trip, and key-presence.
- Regression test case 0003: mlr help verb-options-nil-check golden output.
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
* Migrate all 70 verbs to structured OptionSpec; bump catalog schema to v2
Completes the Tier-2 migration started in the previous commit. Every verb
in TRANSFORMER_LOOKUP_TABLE now has a non-nil Options field.
- Workflow-migrated all 65 remaining verbs. Each Setup var now carries
Options: []OptionSpec{...} with Flag/Arg/Type/Desc fields. Verbs with
no verb-specific options (altkv, check, group-like, nothing, etc.) use
an empty slice to signal "migrated but no options."
- Drop `omitempty` from VerbInfoForJSON.Options: empty slices were silently
dropped, making migrated-no-option verbs indistinguishable from unmigrated
ones in JSON. Without omitempty: null=unmigrated, []=migrated-no-options,
[...]= migrated-with-options. Bump catalogSchemaVersion 1→2 for this shape
change.
- Replace the two "unmigrated-verb" unit tests (which used stats1 as an
example) with TestAllVerbsFullyMigrated (asserts every verb has non-nil
Options) and TestAllVerbsHaveOptionsKeyInJSON (asserts every migrated
verb emits the "options" key in JSON).
- Regenerate test/cases/cli-help/0003/expout: now reads
"Verb options migration: 70/70 migrated."
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
* remove a transitional helper
* git rms
* Render verb usage Options blocks from structured OptionSpec
Each verb's usage message and its Tier-2 OptionSpec list previously
duplicated the option text. New WriteVerbOptions (aaa_verb_usage.go)
renders the "Options:" block from the specs: aligned flag column,
descriptions word-wrapped at 80, uniform trailing -h|--help line.
- OptionSpec gains Aliases (JSON "aliases") so long-form spellings
like join's --lk|--left-keep-field-names survive in both outputs
- All 70 verbs migrated; options literals hoisted to package-level
vars (usage funcs can't reference their Setup var without a Go
init cycle)
- Hand-written per-option details the specs had condensed away are
merged into Desc, enriching the JSON catalog
- Non-option prose (examples, cross-references, dynamic accumulator
listings) kept verbatim
- Regenerated the six usage-embedding regression expectations and
the two affected doc pages
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Fix pre-existing usage-text bugs surfaced by the OptionSpec migration
- gap: usage said "One of -f or -g is required" but the parser takes
-n or -g
- seqgen: drop description line copy-pasted from cat ("Passes input
records directly to output...") which contradicted "Discards the
input record stream"
- utf8-to-latin1: description read inverted ("from Latin-1 to UTF-8")
- sec2gmtdate: usage said "../c/mlr" instead of "mlr"
- top: document the accepted-but-undocumented --max flag
- stats2: add linreg-pca to the -a enum values, matching the runtime
accumulator table
Regression expectations and docs regenerated accordingly.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Fix check usage sentence order; stats1 usage blank line to usage stream
- check: the description's second and third lines were swapped,
reading "Consumes records without printing any output, / Useful for
doing a well-formatted check on input data. / with the exception
that warnings are printed to stderr."
- stats1: a bare fmt.Println() in the usage func wrote its blank line
to process stdout instead of the usage output stream
Regression expectation and docs regenerated.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---------
Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
Inspired by GNU head & tail, they match their behavior while supporting
the usual grouping operations.
Co-authored-by: John Kerl <kerl.john.r@gmail.com>
The --lp/--rp prefixes and -j output-field rename were applied only to
paired records, leaving unpaired records emitted via --ul/--ur with their
original (left/right) field names. This broke downstream operations like
unsparsify that expected consistent column names across paired and
unpaired output.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* Default to "cat" verb when none is supplied (#2029)
Invocations like 'mlr --j2y' or 'mlr --c2p' previously failed with
"no verb supplied", forcing users to type the trailing 'cat'
explicitly for pure format conversions. Default the verb to 'cat'
in that case. Bare 'mlr' with no flags, no verb, and no files
still prints the main usage banner.
This handles flag-only invocations (e.g. 'mlr --c2j < input.csv'
or 'mlr --c2j --from input.csv'). File names without a preceding
verb are still parsed as verb candidates and continue to error if
not found; that broader change is out of scope here.
* Use ${MLR} substitution for bare-mlr regression case (#2029)
The regtester only substitutes the mlr executable when the cmd
starts with "mlr " (with a trailing space). The bare-mlr usage-banner
test had a cmd of just "mlr", so on CI -- which invokes regtest with
a relative path like 'test/../mlr' -- the test shelled out to a
literal 'mlr' that isn't on PATH and failed with exit 127.
Switch the cmd to ${MLR} (the regtester's explicit substitution
token) so the case runs the right binary in any invocation context.
* DSL stats functions [WIP]
* refactor
* move percentile computation to bifs module; iterate
* mode and antimode
* percentile iterate
* percentile sketching
* neaten
* unit-test iterate
* unify old & new min & max functions
* unit-test cases
* code-dedupe between mode and antimode
* make mode/antimode ties deterministic via first-found-wins rule
* online help strings for new stats DSL functions
* artifacts from `make dev`
* help info on how min/max now recurse into collections
* artifacts from `make dev`
* typofix
