fq/doc/TODO.md

Known issues

• format/0 overlap with jq builtin format/1. What to rename it to? decode_format?
• repl expression returning a value that produced lots of output can't be interrupted. This is becaus ctrl-C currently only interrupts the evaluation of the expression, outputted value is printed (display) by parent.
• Auto complete of non-global variables is broken. scope is broken for variables.
• tovalue({bits_format: "base64"}) only affect root value.
• Unknown field filling is currently only done on root, should be done per "framed" decode.
• Sub buffers range is broken, could have a different size in parent (ex: compressed).
• Symbolic values should be more intuitive, should not need to use ._symbol.
• echo '{} {} {}' | jq vs echo '{} {} {}' | fq works differently. fq currently decodes one root format and might add unknown fields etc. Maybe should work differently for json format?

TODO and ideas

CLI

• --args support
• Reset color at prompt? context cancel

CLI and REPL

• ctxstack index cancel wrong order, should just skip?
• Pager for long output. Configurable? $PAGER? only explicit with some kind of syntax? .. | less but how?
• Nicer context cancel message
• dump cancel output of large root value, ex: .frames. Problem is dump is done by parent repl.
• Error position "^" pointer?
• Configurable history file/name?
• Auto complete $variables
• Auto complete keys that need escaping, now just filtered out
• Auto complete add "." just one and is object
• Use JQ_COLORS but extended to allow name= also?

Language

• Nicer variables somehow? ... | var($VAR)? make slurp and rewrite $var to $var[]?
• Cleanup/Make binary buffers make sense.
• gojq uses golang int for slice indexes, might be issue for non-64bit cpus

Functions

• buffer truncate, left/right pad?
• toimage? can be done in CLI with "\x1b]1337" but maybe something for a UI?
• toplot?
• dump should handle binary, make column code more generic? share with hexdump? (bindump also?)
• dump colorize/notify row range discontinuity
• dump truncate long arrays in output unless verbose? dd?
• hexdump etc should handle binary non byte aligned data
• tojvalue handle binary somehow, base64 string, truncate? md5 digest etc? configurable? {binarystring: "md5"}
• Function to search in binary data, regexp?
• grep like function somehow?
• Cleanup rework cipher functions, ctr(aes("key"), "iv") or cipher(ctr("iv"), aes("key))?
• open when to close file?
• Safe mode interpreter?
• Allow/deny open in autocomplete
• open leak, file and ctxreadseeker

Tests

• WRITE_ACTUAL does not preserve comment order
• empty file test
• CLI tests, raw write, colors?
• Interactive tests

Documentation

• Nicer README, repl example (generate somehow)
• help("topic")?
• Generate from source
• -n, inputs/0 and input/0 behavior. Same as jq.
• Mention empty.something?
• repl behavior
  • 1,2,3 | repl will start 3 repl:s
  • Behave same as CLi expres: iterate over all inputs [1,2,3] | repl({}; .[])
• Known issus and confusing things
  • Symbolic number has to use ._symbol for now. For example matroska ids are number ID:s that have symbolic string names.
• Use https://github.com/fadado/JBOL/blob/master/doc/JQ-Distilled.md notation
• Decoder write guide
  • Endian inherited per buffer, reset on new buffer
  • Invalid on zero length input, assert one valid frame etc
  • Try validate input to make it not ambiguous with other decoders
  • Try to not seek and read at end while validating or early, will break progress indicator if not
  • Split bit flags etc into a field with subfields for each bit
  • Try keep code as declarative as possible
  • Split into multiple sub formats if possible
  • See the decoded tree as user interface but still has to represent the actual bit structure

Decode

• Store original filename somewhere? description for now
• Nicer DSL
  • More optional things? optional args or return value to modify?
• Nicer "synthetic" values? now zero length
• Value should have raw, tranlated, symbolic and description? struct of map functions?
  • If symbolic should resolve to string? would make .field == "abc" work instead of now .field._symbolic
• Array as root value, adts, avc_au etc
• Decode framed/limited? framed adds unknown fields?
• Add unknown for arrays?
• Cleanup and rethink nested buffers (zip, muxed like ogg)
  • Root of nested buffer, what range?
• dump has some bug not showing buffer "nesting" level in the address column
• Endian bitfield helper (elf etc)
• Cleanup checksums, should just be fields and add warning if mismatch?
• Decoder in jq
  • Use jq array/object syntax and pass around decode context, collect fields and build tree
• Somehow control/limit nested decoding, depth/exclude/include? probe({depth:1}) etc? per format skip options?
• Can't use range while decoding, not calculated yet
• Keep track of encoding for values, u16le, utf8, varint etc
• Option to ignore range checks, decode until read error instead. Ex: mp4 with truncated mdat.

Formats

• Pass argument to format
• Value decoder in jq u(32), u32?
• Warnings and errors
  • mp4 sample counts
  • flac truncated picture, mix sample rate, bitdepth etc?
• protobuf schema?
• matroska crc
• mp4 styp segment test
• Document maturity/completeness
• Refactor *[]decode.Format into something more abstract, group?
• Add dsf format
• Make json format more normal? is a bit a of a special case now

Scripts

• Summary script, tree with format specific summaries like codec, sample count etc etc?
• Probe tool with common field names
• MIME codec encode/decoder "avc1.PPCCLL" etc https://tools.ietf.org/html/rfc6381#section-3.3
• Validate scripts for mp4, matroska

gojq

• Common errors with gojq? re-implemented now
• join can be exponential, try add with strings faster, use add ["a","b","c"] | add?
• 0b -> 1.7976931348623157e+308 something fishy with bin/hex/... literals change
• Do something similar to builtin.go in gojq to speedup a bit
• remove scopedump?

Readline

• Use something else than github.com/chzyer/readline?
• Fix backspace as start clears whole line bug
• Undo ctrl+_ would be nice

Big things

• UI, web interface? multiple repl windows? nicer way of showing overlapping fiends in hex etc?
• jupyter notebook integration
• FUSE interface
• Lazy decode, should work on known sizes? could also save memory be re-decode?