Merge e9226226d3 into 1ec9748046

TODO:
- show somehow generalize to/from encodings?
- move code to somwewhere else?

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ on:
   pull_request:
 
 env:
-  GOLANGCILINT_VERSION: "1.57.2"
+  GOLANGCILINT_VERSION: "1.58.1"
 
 jobs:
   lint:
@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v3
         with:
-          go-version: "1.22.2"
+          go-version: "1.22.3"
       - uses: actions/checkout@v3
       - uses: golangci/golangci-lint-action@v3
         with:
@@ -47,7 +47,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
         with:
-          go-version: "1.22.2"
+          go-version: "1.22.3"
       - name: Test
         env:
           GOARCH: ${{ matrix.goarch }}

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-go@v3
         with:
-          go-version: "1.22.2"
+          go-version: "1.22.3"
       - uses: goreleaser/goreleaser-action@v5
         with:
           distribution: goreleaser

Dockerfile

@@ -1,5 +1,5 @@
 # bump: docker-golang /FROM golang:([\d.]+)/ docker:golang|^1
-FROM golang:1.22.2-bookworm AS base
+FROM golang:1.22.3-bookworm AS base
 
 # expect is used to test cli
 RUN \

Makefile

@@ -61,7 +61,7 @@ gogenerate: always
 lint: always
 # bump: make-golangci-lint /golangci-lint@v([\d.]+)/ git:https://github.com/golangci/golangci-lint.git|^1
 # bump: make-golangci-lint link "Release notes" https://github.com/golangci/golangci-lint/releases/tag/v$LATEST
-	go run github.com/golangci/golangci-lint/cmd/golangci-lint@v1.57.2 run
+	go run github.com/golangci/golangci-lint/cmd/golangci-lint@v1.58.1 run
 
 depgraph.svg: always
 	go run github.com/kisielk/godepgraph@latest github.com/wader/fq | dot -Tsvg -o godepgraph.svg

README.md

@@ -2,25 +2,23 @@
 
 Tool, language and decoders for working with binary data.
 
+TLDR: it aims to be jq, hexdump, dd and gdb for files combined into one.
+
 ![fq demo](doc/demo.svg)
 
-Basic usage is `fq . file` or `fq d file`.
+Basic usage is `fq . file`, `fq d file` or `fq 'some query' file ...`.
 
 For details see [usage.md](doc/usage.md).
 
 ### Background
 
-fq is inspired by the well known jq tool and language that allows you to work with binary formats the same way you would using jq. In addition it can present data like a hex viewer, transform, slice and concatenate binary data. It also supports nested formats and has an interactive REPL with auto-completion.
+fq is inspired by the [jq](https://jqlang.github.io/jq/) tool and language and allows you to work with binary formats in the same way. In addition to using jq expressions it can also present decoded tree structures, transform, slice and concatenate binary data. It also supports nested formats and features an interactive REPL with auto-completion of functions and names.
 
-It was originally designed to query, inspect and debug media codecs and containers like mp4, flac, mp3, jpeg. But since then it has been extended to support a variety of formats like executables, packet captures (with TCP reassembly) and serialization formats like JSON, YAML, XML, ASN1 BER, Avro, CBOR, protobuf. In addition it also has functions to work with URLs, convert to/from hex, number bases, search for things etc.
-
-In summary it aims to be jq, hexdump, dd and gdb for files combined into one.
-
-**NOTE:** fq is still early in development so things might change, be broken or do not make sense. That also means that there is a great opportunity to help out!
+It was originally designed to query, inspect and debug media codecs and containers like MP4, FLAC and JPEG but has since been extended to support a variety of formats like executables, packet captures (with TCP reassembly) and serialization formats like JSON, YAML, XML, CBOR, protobuf. In addition it also has functions to work with URLs, convert to/from hex, number bases, search for patterns etc.
 
 ### Goals
 
-- Make binaries accessible, queryable and sliceable.
+- Make binaries more accessible, queryable and sliceable.
 - Nested formats and bit-oriented decoding.
 - Quick and comfortable CLI tool.
 - Bits and bytes transformations.
@@ -243,7 +241,7 @@ apk add -X http://dl-cdn.alpinelinux.org/alpine/edge/testing fq
 
 Make sure you have [go](https://go.dev) 1.20 or later installed.
 
-To install directly from git repository (no clone needed):
+To install directly from git repository (no git clone needed):
 ```sh
 # build and install latest release
 go install github.com/wader/fq@latest
@@ -267,10 +265,6 @@ go build -o fq .
 make test fq
 ```
 
-## TODO and ideas
-
-See [TODO.md](doc/TODO.md)
-
 ## Development and adding a new decoder
 
 See [dev.md](doc/dev.md)
@@ -306,6 +300,10 @@ for inventing the [jq](https://github.com/stedolan/jq) language.
 - [Sustainability of Digital Formats](https://www.loc.gov/preservation/digital/formats/) at Library of Congress.
 - [Data Format Description Language (DFDL)](https://en.wikipedia.org/wiki/Data_Format_Description_Language).
 
+## TODO and ideas
+
+See [TODO.md](doc/TODO.md)
+
 ## License
 
 `fq` is distributed under the terms of the MIT License.

doc/dev.md

@@ -236,8 +236,8 @@ make test
 go test ./...
 # run all tests for one format
 go test -run TestFormats/mp4 ./format/
-# update all actual outputs in tests
-go test ./... -update
+# update all expected outputs for tests
+go test ./pkg/interp ./format -update
 # update actual output for specific tests
 go run ./format -run TestFormats/elf -update
 # color diff

format/bits/bits.go

@@ -2,14 +2,21 @@ package bits
 
 import (
 	"embed"
+	"encoding/binary"
+	"fmt"
+	"math"
 
 	"github.com/wader/fq/format"
+	"github.com/wader/fq/internal/gojqx"
+	"github.com/wader/fq/internal/mathx"
+	"github.com/wader/fq/pkg/bitio"
 	"github.com/wader/fq/pkg/decode"
 	"github.com/wader/fq/pkg/interp"
 	"github.com/wader/fq/pkg/scalar"
 )
 
 //go:embed bits.md
+//go:embed bits.jq
 //go:embed bytes.md
 var bitsFS embed.FS
 
@@ -39,5 +46,74 @@ func init() {
 			DecodeFn:           decodeBits(8),
 			SkipDecodeFunction: true, // skip add bytes and frombytes function
 		})
+	interp.RegisterFunc2("_from_float", func(_ *interp.Interp, c any, nBits int, isLE bool) any {
+		switch nBits {
+		case 16, 32, 64:
+		default:
+			return fmt.Errorf("unsupported bit size %d, must be 16, 32 or 64", nBits)
+		}
+
+		br, err := interp.ToBitReader(c)
+		if err != nil {
+			return err
+		}
+		var b [8]byte
+		bs := b[:][0 : nBits/8]
+		_, err = br.ReadBits(bs[:], int64(nBits))
+		if err != nil {
+			return err
+		}
+		if isLE {
+			decode.ReverseBytes(bs[:])
+		}
+
+		switch nBits {
+		case 64:
+			return math.Float64frombits(binary.BigEndian.Uint64(bs[:]))
+		case 32:
+			return float64(math.Float32frombits(binary.BigEndian.Uint32(bs[:])))
+		case 16:
+			return float64(mathx.Float16(binary.BigEndian.Uint16(bs[:])).Float32())
+		default:
+			panic("unreachable")
+		}
+	})
+	interp.RegisterFunc2("_to_float", func(_ *interp.Interp, c any, nBits int, isLE bool) any {
+		switch nBits {
+		case 16, 32, 64:
+		default:
+			return fmt.Errorf("unsupported bit size %d, must be 16, 32 or 64", nBits)
+		}
+
+		v, ok := gojqx.Cast[float64](c)
+		if !ok {
+			return gojqx.FuncTypeError{Name: "_to_float", V: v}
+		}
+
+		var b [8]byte
+		bs := b[:][0 : nBits/8]
+		switch nBits {
+		case 64:
+			binary.BigEndian.PutUint64(bs, math.Float64bits(v))
+		case 32:
+			binary.BigEndian.PutUint32(bs, math.Float32bits(float32(v)))
+		case 16:
+			binary.BigEndian.PutUint16(bs, uint16(mathx.NewFloat16(float32(v))))
+		default:
+			panic("unreachable")
+		}
+		if isLE {
+			decode.ReverseBytes(bs[:])
+		}
+
+		br, err := interp.NewBinaryFromBitReader(bitio.NewBitReader(bs, -1), 8, 0)
+		if err != nil {
+			return err
+		}
+
+		return br
+
+	})
+
 	interp.RegisterFS(bitsFS)
 }

format/bits/bits.jq

@@ -0,0 +1,12 @@
+def from_f16be: _from_float(16; false);
+def from_f32be: _from_float(32; false);
+def from_f64be: _from_float(64; false);
+def from_f16le: _from_float(16; true);
+def from_f32le: _from_float(32; true);
+def from_f64le: _from_float(64; true);
+def to_f16le: _to_float(16; true);
+def to_f32le: _to_float(32; true);
+def to_f64le: _to_float(64; true);
+def to_f16be: _to_float(16; false);
+def to_f32be: _to_float(32; false);
+def to_f64be: _to_float(64; false);

format/jpeg/jpeg.go

@@ -262,6 +262,29 @@ func jpegDecode(d *decode.D) any {
 								}
 							})
 						})
+					case DHT:
+						lH := int64(d.FieldU16("lh"))
+						d.FramedFn(lH*8-16, func(d *decode.D) {
+							d.FieldArray("hs", func(d *decode.D) {
+								for d.NotEnd() {
+									d.FieldStruct("h", func(d *decode.D) {
+										d.FieldU4("tc")
+										d.FieldU4("th")
+										hK := uint64(0)
+										hV := uint64(0)
+										d.FieldArrayLoop("l", func() bool { return hK < 16 }, func(d *decode.D) {
+											hV += d.FieldU8("l")
+											hK++
+										})
+										hK = 0
+										d.FieldArrayLoop("v", func() bool { return hK < hV }, func(d *decode.D) {
+											d.FieldU8("v")
+											hK++
+										})
+									})
+								}
+							})
+						})
 					case RST0, RST1, RST2, RST3, RST4, RST5, RST6, RST7:
 						inECD = true
 					case TEM:

format/jpeg/testdata/4x4.fqtest

@@ -109,15 +109,57 @@ $ fq -d jpeg dv 4x4.jpg
     |                                               |                |    [4]{}: marker 0x66-0x7c (22)
 0x60|                  ff                           |      .         |      prefix: raw bits (valid) 0x66-0x67 (1)
 0x60|                     c4                        |       .        |      code: "dht" (196) (Define Huffman table(s)) 0x67-0x68 (1)
-0x60|                        00 14                  |        ..      |      length: 20 0x68-0x6a (2)
-0x60|                              00 01 00 00 00 00|          ......|      data: raw bits 0x6a-0x7c (18)
-0x70|00 00 00 00 00 00 00 00 00 00 00 08            |............    |
+0x60|                        00 14                  |        ..      |      lh: 20 0x68-0x6a (2)
+    |                                               |                |      hs[0:1]: 0x6a-0x7c (18)
+    |                                               |                |        [0]{}: h 0x6a-0x7c (18)
+0x60|                              00               |          .     |          tc: 0 0x6a-0x6a.4 (0.4)
+0x60|                              00               |          .     |          th: 0 0x6a.4-0x6b (0.4)
+    |                                               |                |          l[0:16]: 0x6b-0x7b (16)
+0x60|                                 01            |           .    |            [0]: 1 l 0x6b-0x6c (1)
+0x60|                                    00         |            .   |            [1]: 0 l 0x6c-0x6d (1)
+0x60|                                       00      |             .  |            [2]: 0 l 0x6d-0x6e (1)
+0x60|                                          00   |              . |            [3]: 0 l 0x6e-0x6f (1)
+0x60|                                             00|               .|            [4]: 0 l 0x6f-0x70 (1)
+0x70|00                                             |.               |            [5]: 0 l 0x70-0x71 (1)
+0x70|   00                                          | .              |            [6]: 0 l 0x71-0x72 (1)
+0x70|      00                                       |  .             |            [7]: 0 l 0x72-0x73 (1)
+0x70|         00                                    |   .            |            [8]: 0 l 0x73-0x74 (1)
+0x70|            00                                 |    .           |            [9]: 0 l 0x74-0x75 (1)
+0x70|               00                              |     .          |            [10]: 0 l 0x75-0x76 (1)
+0x70|                  00                           |      .         |            [11]: 0 l 0x76-0x77 (1)
+0x70|                     00                        |       .        |            [12]: 0 l 0x77-0x78 (1)
+0x70|                        00                     |        .       |            [13]: 0 l 0x78-0x79 (1)
+0x70|                           00                  |         .      |            [14]: 0 l 0x79-0x7a (1)
+0x70|                              00               |          .     |            [15]: 0 l 0x7a-0x7b (1)
+    |                                               |                |          v[0:1]: 0x7b-0x7c (1)
+0x70|                                 08            |           .    |            [0]: 8 v 0x7b-0x7c (1)
     |                                               |                |    [5]{}: marker 0x7c-0x92 (22)
 0x70|                                    ff         |            .   |      prefix: raw bits (valid) 0x7c-0x7d (1)
 0x70|                                       c4      |             .  |      code: "dht" (196) (Define Huffman table(s)) 0x7d-0x7e (1)
-0x70|                                          00 14|              ..|      length: 20 0x7e-0x80 (2)
-0x80|10 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00|................|      data: raw bits 0x80-0x92 (18)
-0x90|00 00                                          |..              |
+0x70|                                          00 14|              ..|      lh: 20 0x7e-0x80 (2)
+    |                                               |                |      hs[0:1]: 0x80-0x92 (18)
+    |                                               |                |        [0]{}: h 0x80-0x92 (18)
+0x80|10                                             |.               |          tc: 1 0x80-0x80.4 (0.4)
+0x80|10                                             |.               |          th: 0 0x80.4-0x81 (0.4)
+    |                                               |                |          l[0:16]: 0x81-0x91 (16)
+0x80|   01                                          | .              |            [0]: 1 l 0x81-0x82 (1)
+0x80|      00                                       |  .             |            [1]: 0 l 0x82-0x83 (1)
+0x80|         00                                    |   .            |            [2]: 0 l 0x83-0x84 (1)
+0x80|            00                                 |    .           |            [3]: 0 l 0x84-0x85 (1)
+0x80|               00                              |     .          |            [4]: 0 l 0x85-0x86 (1)
+0x80|                  00                           |      .         |            [5]: 0 l 0x86-0x87 (1)
+0x80|                     00                        |       .        |            [6]: 0 l 0x87-0x88 (1)
+0x80|                        00                     |        .       |            [7]: 0 l 0x88-0x89 (1)
+0x80|                           00                  |         .      |            [8]: 0 l 0x89-0x8a (1)
+0x80|                              00               |          .     |            [9]: 0 l 0x8a-0x8b (1)
+0x80|                                 00            |           .    |            [10]: 0 l 0x8b-0x8c (1)
+0x80|                                    00         |            .   |            [11]: 0 l 0x8c-0x8d (1)
+0x80|                                       00      |             .  |            [12]: 0 l 0x8d-0x8e (1)
+0x80|                                          00   |              . |            [13]: 0 l 0x8e-0x8f (1)
+0x80|                                             00|               .|            [14]: 0 l 0x8f-0x90 (1)
+0x90|00                                             |.               |            [15]: 0 l 0x90-0x91 (1)
+    |                                               |                |          v[0:1]: 0x91-0x92 (1)
+0x90|   00                                          | .              |            [0]: 0 v 0x91-0x92 (1)
     |                                               |                |    [6]{}: marker 0x92-0x9c (10)
 0x90|      ff                                       |  .             |      prefix: raw bits (valid) 0x92-0x93 (1)
 0x90|         da                                    |   .            |      code: "sos" (218) (Start of scan) 0x93-0x94 (1)

go.mod

@@ -19,7 +19,7 @@ require (
 	// bump: gomod-ergochat-readline /github\.com\/ergochat\/readline v(.*)/ https://github.com/ergochat/readline.git|*
 	// bump: gomod-ergochat-readline command go get -d github.com/ergochat/readline@v$LATEST && go mod tidy
 	// bump: gomod-ergochat-readline link "Release notes" https://github.com/ergochat/readline/releases/tag/v$LATEST
-	github.com/ergochat/readline v0.1.0
+	github.com/ergochat/readline v0.1.1
 
 	// bump: gomod-golang-snappy /github\.com\/golang\/snappy v(.*)/ https://github.com/golang/snappy.git|^0
 	// bump: gomod-golang-snappy command go get -d github.com/golang/snappy@v$LATEST && go mod tidy
@@ -48,7 +48,7 @@ require (
 	// bump: gomod-golang-x-crypto /golang\.org\/x\/crypto v(.*)/ https://github.com/golang/crypto.git|^0
 	// bump: gomod-golang-x-crypto command go get -d golang.org/x/crypto@v$LATEST && go mod tidy
 	// bump: gomod-golang-x-crypto link "Tags" https://github.com/golang/crypto/tags
-	golang.org/x/crypto v0.22.0
+	golang.org/x/crypto v0.23.0
 
 	// has no tags
 	// go get -d golang.org/x/exp@master && go mod tidy
@@ -57,17 +57,17 @@ require (
 	// bump: gomod-golang-x-net /golang\.org\/x\/net v(.*)/ https://github.com/golang/net.git|^0
 	// bump: gomod-golang-x-net command go get -d golang.org/x/net@v$LATEST && go mod tidy
 	// bump: gomod-golang-x-net link "Tags" https://github.com/golang/net/tags
-	golang.org/x/net v0.24.0
+	golang.org/x/net v0.25.0
 
 	// bump: gomod-golang-x-term /golang\.org\/x\/term v(.*)/ https://github.com/golang/term.git|^0
 	// bump: gomod-golang-x-term command go get -d golang.org/x/term@v$LATEST && go mod tidy
 	// bump: gomod-golang-x-term link "Tags" https://github.com/golang/term/tags
-	golang.org/x/term v0.19.0
+	golang.org/x/term v0.20.0
 
 	// bump: gomod-golang/text /golang\.org\/x\/text v(.*)/ https://github.com/golang/text.git|^0
 	// bump: gomod-golang/text command go get -d golang.org/x/text@v$LATEST && go mod tidy
 	// bump: gomod-golang/text link "Source diff $CURRENT..$LATEST" https://github.com/golang/text/compare/v$CURRENT..v$LATEST
-	golang.org/x/text v0.14.0
+	golang.org/x/text v0.15.0
 
 	// bump: gomod-gopkg.in/yaml.v3 /gopkg\.in\/yaml\.v3 v(.*)/ https://github.com/go-yaml/yaml.git|^3
 	// bump: gomod-gopkg.in/yaml.v3 command go get -d gopkg.in/yaml.v3@v$LATEST && go mod tidy
@@ -79,6 +79,6 @@ require (
 	github.com/itchyny/timefmt-go v0.1.5 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
-	golang.org/x/sys v0.19.0 // indirect
+	golang.org/x/sys v0.20.0 // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 )

go.sum

@@ -2,8 +2,8 @@ github.com/BurntSushi/toml v1.3.2 h1:o7IhLm0Msx3BaB+n3Ag7L8EVlByGnpq14C4YWiu/gL8
 github.com/BurntSushi/toml v1.3.2/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/creasty/defaults v1.7.0 h1:eNdqZvc5B509z18lD8yc212CAqJNvfT1Jq6L8WowdBA=
 github.com/creasty/defaults v1.7.0/go.mod h1:iGzKe6pbEHnpMPtfDXZEr0NVxWnPTjb1bbDy08fPzYM=
-github.com/ergochat/readline v0.1.0 h1:KEIiAnyH9qGZB4K8oq5mgDcExlEKwmZDcyyocgJiABc=
-github.com/ergochat/readline v0.1.0/go.mod h1:o3ux9QLHLm77bq7hDB21UTm6HlV2++IPDMfIfKDuOgY=
+github.com/ergochat/readline v0.1.1 h1:C8Uuo3ybB23GWOt0uxmHbGzKM9owmtXary6Clrj84s0=
+github.com/ergochat/readline v0.1.1/go.mod h1:o3ux9QLHLm77bq7hDB21UTm6HlV2++IPDMfIfKDuOgY=
 github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
 github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/gomarkdown/markdown v0.0.0-20240328165702-4d01890c35c0 h1:4gjrh/PN2MuWCCElk8/I4OCKRKWCCo2zEct3VKCbibU=
@@ -25,18 +25,18 @@ github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWb
 github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/wader/gojq v0.12.1-0.20240401131232-6c6bc364201a h1:P881Oecjt9FEXrwkGJ6UObJksxejJaF/fKq1ZfXpiVE=
 github.com/wader/gojq v0.12.1-0.20240401131232-6c6bc364201a/go.mod h1:qVrzkUdnBtJvM4twyRQ6xdziPSnSp35dLm4s/DN2iP4=
-golang.org/x/crypto v0.22.0 h1:g1v0xeRhjcugydODzvb3mEM9SQ0HGp9s/nh3COQ/C30=
-golang.org/x/crypto v0.22.0/go.mod h1:vr6Su+7cTlO45qkww3VDJlzDn0ctJvRgYbC2NvXHt+M=
+golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
+golang.org/x/crypto v0.23.0/go.mod h1:CKFgDieR+mRhux2Lsu27y0fO304Db0wZe70UKqHu0v8=
 golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8 h1:aAcj0Da7eBAtrTp03QXWvm88pSyOt+UgdZw2BFZ+lEw=
 golang.org/x/exp v0.0.0-20240325151524-a685a6edb6d8/go.mod h1:CQ1k9gNrJ50XIzaKCRR2hssIjF07kZFEiieALBM/ARQ=
-golang.org/x/net v0.24.0 h1:1PcaxkF854Fu3+lvBIx5SYn9wRlBzzcnHZSiaFFAb0w=
-golang.org/x/net v0.24.0/go.mod h1:2Q7sJY5mzlzWjKtYUEXSlBWCdyaioyXzRB2RtU8KVE8=
-golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
-golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/term v0.19.0 h1:+ThwsDv+tYfnJFhF4L8jITxu1tdTWRTZpdsWgEgjL6Q=
-golang.org/x/term v0.19.0/go.mod h1:2CuTdWZ7KHSQwUzKva0cbMg6q2DMI3Mmxp+gKJbskEk=
-golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
-golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
+golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.20.0 h1:VnkxpohqXaOBYJtBmEppKUG6mXpi+4O6purfc2+sMhw=
+golang.org/x/term v0.20.0/go.mod h1:8UkIAJTvZgivsXaD6/pH6U9ecQzZ45awqEOzuCvwpFY=
+golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
+golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
 gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

pkg/interp/help.jq

@@ -54,9 +54,6 @@ Same as recurse without argument.
       }
   };
 
-def help($_): error("help must be alone or last in pipeline. ex: help(length) or ... | help");
-def help: help(null);
-
 def _help_format_enrich($arg0; $f; $include_basic):
   ( if $include_basic then
       .examples +=
@@ -76,6 +73,9 @@ def _help_format_enrich($arg0; $f; $include_basic):
     end
   );
 
+# trailing help gets rewritten to _help_slurp, these are here to catch other variants
+def help($_): error("help must be alone or last in pipeline. ex: help(length) or ... | help");
+def help: help(null);
 def _help($arg0; $topic):
   ( $topic
   | if  . == "usage" then
@@ -236,7 +236,7 @@ def _help($arg0; $topic):
     | ($args | length) as $argc
     | if $args == null then
         # help
-        ( "Type expression to evaluate"
+        ( "Type jq expression to evaluate"
         , "help(...)   Help for topic. Ex: help(mp4), help(\"mp4\")"
         , "\\t          Completion"
         , "Up/Down     History"

pkg/interp/testdata/help.fqtest

@@ -1,6 +1,6 @@
 $ fq -ni
 null> help
-Type expression to evaluate
+Type jq expression to evaluate
 help(...)   Help for topic. Ex: help(mp4), help("mp4")
 \t          Completion
 Up/Down     History