With --right-align-numeric, PPRINT data cells right-align but headers
stayed left-aligned, so a header did not line up with its own column's
data -- the original ask in #380. Now a header is right-aligned when
every value in its column is numeric, for both non-barred and barred
PPRINT output. Mixed columns keep left-aligned headers.
For --omd-aligned, the raw header text of right-aligned columns is now
right-justified too, matching how Markdown viewers render the ---:
marker; this follows the same all-values-numeric per-column rule
already used for the separator markers.
Man-page regeneration also picks up previously-merged reorder help-text
edits that had not been regenerated.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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>
When the skip-trivial-records verb is in the then-chain, the CSV/TSV
record-readers now silently skip trivial (all-fields-empty) input lines
-- notably blank lines at the end of a CSV file -- instead of raising a
fatal header/data length mismatch. The user has explicitly asked for
trivial records to be skipped, so mlr now exits 0 in this case.
The verb's CLI parser sets a new ReaderOptions.SkipTrivialRecords flag,
which the CSV and TSV readers consult only on the would-be-fatal
mismatch path, so:
* Behavior without the verb is unchanged: blank lines still error.
* Genuinely ragged non-trivial records still error even with the verb.
* --allow-ragged-csv-input behavior is unchanged.
Fixes#1535.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
In the explicit-header ragged code paths of the csvlite, TSV, and
barred-pprint readers, the header-longer-than-data fill used
record.PutCopy with the un-deduplicated header name. With duplicate
header names (e.g. "name,4,4" deduped to "name,4,4_2"), the VOID fill
for the missing trailing field overwrote the already-stored value under
the colliding key, so a short row like "bar,sea" lost "sea".
Use record.PutReferenceMaybeDedupe, as the implicit-header paths
already do (where PR #794 had applied it, although implicit headers are
generated unique and never need dedupe).
Adds regression cases under test/cases/io-dedupe-field-names/ for the
csvlite, TSV, and barred-pprint readers.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Plain {} placeholders consume arguments sequentially as before; {N}
refers to the Nth argument (1-based) and may be used to repeat and/or
reorder arguments, e.g. format("{1}/{2}/{1}_{3}.ext", $p1, $p2, $p3).
Mixing is allowed: the {} sequence counter is independent of positional
placeholders (as in Rust format!). Out-of-range indices interpolate the
empty string, consistent with existing too-few-arguments behavior; {0}
is an error value since indices are 1-based.
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>
For PPRINT, right-justifies data cells whose values are numeric,
leaving other cells and header lines left-justified. For Markdown,
emits right-alignment markers (---:) for numeric columns; in
--omd-aligned mode also right-justifies the raw cell text.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
* Honor --ors CRLF for CSV output (#1810)
The full-CSV record writer validated ORS as newline or
carriage-return/newline, but never propagated the choice to the forked
Go CSV writer's UseCRLF field, so `--ors '\r\n'` (or `--ors crlf`)
silently produced LF line endings. Set UseCRLF from the writer options
so CRLF output is honored. Default behavior (LF) is unchanged, and
other ORS values are still rejected. The CSV-lite and TSV writers
already honored CRLF ORS.
Also: fix a copy-paste "for CSV" in the TSV writer's ORS-validation
message, add unit tests asserting byte-exact line endings (the regtest
harness normalizes CR/LF, so this can't be asserted in test/cases), add
CLI-level regression cases, and update the separators documentation.
This substantially addresses #1722 as well: RFC-4180-style CRLF output
can now be requested on any platform.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Fix errcheck lint: check Flush() error in CSV writer test
---------
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>
Miller type-inference accepts float formats which the JSON grammar
disallows -- leading zeros like 004.56, leading plus signs, bare leading
or trailing decimal points like .56 or 4., etc. -- and the JSON writer
passed the original text through verbatim, producing invalid JSON.
Leading-zero integers such as 0123456789 were already handled (inferred
as strings), and hex/binary/octal ints were already re-rendered as
decimal for JSON per #1761; this does the same for floats: when a
float string representation is not a valid JSON number, re-render it
(e.g. 004.56 -> 4.56).
Also documents in reference-main-data-types that CSV double-quoting
does not affect type inference, with -S / --infer-none and string()
as the ways to keep such values as strings.
Addresses #1114 and #1293.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
The tee verb passed the same record pointer both to its file-output
handler (which writes asynchronously on another goroutine, and whose
buffering formats like pprint/json can hold records until close) and
downstream in the verb chain, where subsequent verbs mutate records in
place. Downstream mutations could therefore leak into the tee'd output:
mlr tee -p cat then cat -n then nothing <<EOF
a=1,b=2
a=3,b=4
a=5,b=6
EOF
emitted "n=3,a=5,b=6" for the last tee'd record, and with pprint/json
tee formats every record picked up downstream fields.
Fix: give the file-writer its own deep copy of the record. Same fix
applied to the split verb when -v (emit downstream) is used, which
shared records with downstream the same way.
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>
* Plan: flesh out PR7 (MCP server + Agent Skill) design
stdio transport (no HTTP port), mlr mcp terminal in the main binary,
SDK-vs-handroll decision, tool list, in-process vs subprocess split,
run-tool safety (--no-shell prerequisite), single-sourced skill, tests.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Add mlr mcp: MCP server + agent playbook; --no-shell gate (#2098 PR7)
New terminal `mlr mcp` runs a Model Context Protocol server over stdio
(spawned by MCP clients; no network port), exposing five tools --
list_capabilities, which, validate_dsl, describe_data, run -- plus an
agent playbook as MCP prompt/resource. Catalog tools are served
in-process from the help registries; the rest subprocess this same
binary with MLR_ERRORS_JSON=1, a timeout, and an output cap.
Prerequisite: a new --no-shell flag / MLR_NO_SHELL env var (one-way
gate) disables the DSL system/exec functions, piped redirects, and
--prepipe/--prepipex; the MCP server sets it on the commands it runs
unless started with --allow-shell.
Adds the github.com/modelcontextprotocol/go-sdk dependency.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Force LF checkout for the embedded SKILL.md (Windows CI fix)
go:embed embeds checkout bytes, so a CRLF checkout on Windows made the
embedded playbook differ per platform and failed
TestPlaybookHasFrontmatter. Pin the file to eol=lf in .gitattributes.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Move no-shell test DSL into per-case mlr files (Windows CI fix)
Inline single-quoted DSL in cmd files is mangled by the Windows shell
(single quotes are not quote characters there); the harness's
put -f ${CASEDIR}/mlr pattern avoids shell quoting entirely.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---------
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>
* Add MT_BYTES mlrval type: foundation and disposition tables
First step toward a first-class bytes type in the DSL (#1231).
Adds MT_BYTES (payload []byte, rendered as lowercase hex in all output
formats, JSON-encoded as a hex string), extends every disposition
matrix/vector with the new row/column -- real cells for comparison,
sorting, and dot-concat of bytes with bytes; type-error stubs
elsewhere -- and adds sweep tests asserting no table has nil cells,
since Go zero-fills short array literals when MT_DIM grows.
Bytes values are not yet constructible from the DSL; b"..." literals
and constructor/codec functions follow in subsequent commits.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Add b"..." bytes-literal syntax to the DSL
Adds a bytes_literal token to the grammar (regenerating the PGPG lexer
and parser) and a BytesLiteralNode in the CST which evaluates to an
MT_BYTES mlrval. Escape handling reuses UnbackslashStringLiteral,
which is already byte-oriented: b"\xff" is the single byte 0xff.
Unlike string literals, bytes literals never participate in
regex-capture replacement. A bare identifier b is unaffected.
Part of #1231.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Add bytes DSL functions: conversions, codecs, and bytes-aware built-ins
- bytes(x) converts strings to bytes; string(b) reinterprets raw bytes
as UTF-8 text (the reverse)
- base64_decode now always returns bytes (superseding the interim
string-or-hex behavior); base64_encode accepts string or bytes
- New hex_encode/hex_decode functions
- is_bytes and asserting_bytes predicates
- md5/sha1/sha256/sha512 accept bytes, hashing the raw payload
- strlen of bytes is the byte count; substr/substr0/substr1 on bytes
slice by byte position and return bytes
The Cyrillic-LDAP scenario from #1231 now works without exec
workarounds: string(base64_decode($x)) recovers the text, and binary
payloads survive undamaged as bytes.
Closes#1231.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Add bytes-type docs and regression cases
Documents the bytes type on the data-types page, regenerates the
function-reference/man-page material, and adds regression coverage:
literal escape forms, operators (concat/compare/slice/sort and
type errors), conversions and codec round-trips, and CSV-to-JSON
output rendering of bytes fields.
Part of #1231.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* Reposition MT_BYTES to sort adjacent to MT_STRING in the type enum
MT_BYTES was appended after MT_ABSENT for index stability; move it
right after MT_STRING instead, since that's where it conceptually
belongs and where it already sorts in the cmp disposition matrices.
Mechanically re-derive all ~40 disposition tables in pkg/bifs and
pkg/mlrval accordingly.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
* fix windows CI
* fix merge
---------
Co-authored-by: Claude Fable 5 <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>
* Fix column alignment for wide and combining Unicode chars (#1520, #379)
PPRINT, markdown-aligned, and XTAB writers measured column widths with
utf8.RuneCountInString, which counts codepoints rather than terminal
display columns. East-Asian fullwidth characters (counted as 1 but
displayed as 2) and zero-width combining marks (counted as 1 but
displayed as 0) both caused misalignment.
Add lib.DisplayWidth wrapping uniseg.StringWidth, and use it from the
three writers. The XTAB right-aligned path also drops fmt.Sprintf with
%*s since Go's %*s pads by rune count too.
UTF8Strlen is unchanged so DSL strlen semantics are preserved.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* Fix PPRINT alignment with multi-character OFS (#1819)
Previously, writePadding repeated the OFS string for each padding slot, so
non-space or multi-character OFS values produced misaligned columns and
leaked the separator into padding (e.g. --ofs=XY yielded aXYXYXYXYb).
Pad with spaces instead, leaving OFS to act only as the column separator.
The default single-space OFS is unchanged.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* Use non-space multi-char OFS in test 0021 for Windows portability
PowerShell collapses single-quoted ' ' in command lines, which broke
the test on the windows-latest CI runner. Switch to --ofs XY, which
exercises the same multi-character padding code path without shell
quoting hazards.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.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.
The implicit-header readers for TSV and CSV-lite were missing the
`for` loop in their `nh < nd` branch, so when a data row had more
fields than the auto-generated header, only one extra field was
captured and the rest were dropped. Restore the loop, matching the
explicit-header readers and the pprint reader.
The shebang example `#!/usr/bin/env mlr -s` does not work on Linux
because env(1) does not accept arguments to the interpreter; use
`#!/usr/bin/env -S mlr -s` instead.
`contains` and `index` previously stringified their inputs silently,
so `contains([1,2], $foo)` would match against the literal string
`[1, 2]` and produce surprising results. Both now return a type-error
when either argument is an array or map; help text points users at
`any(arr, func(e){return e == x})` for membership tests.
When using --fr (regex field selector) with stats1 -a null_count, void
(empty) field values were unconditionally skipped in
ingestWithValueFieldRegexes, causing null_count to always report 0.
The non-regex path (ingestWithoutValueFieldRegexes) already had a special
case that allows void values through for null_count accumulators. This
commit adds the same exception to the regex path.
Fixes#1639
Co-authored-by: cobyfrombrooklyn-bot <cobyfrombrooklyn-bot@users.noreply.github.com>
* Move `$[[...]]` and `$[[[...]]]` out of the grammar and into Go
* Update pkg/parsing/mlr.bnf
* Update Go source
* update test files
* Fix NPE
* .gitignore
* more
* reader
* record writer
* pkg/output/record_writer_dcf.go
* test/input/test.dcf
* test/cases/io-dcf/
* pkg/cli/option_parse.go
* make fmt
* make dev
* docs and `make dev`
* docs/src/proposal-yaml-io.md
* initial step
* Add `--y2c` etc
* test cases
* docs
* more testing
* more
* more test cases
* git rm docs/src/proposal-yaml-io.md
* make dev
* ylistwrap -> yarray
