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ANSI stream handling for Elm

License: MIT License

Elm 100.00%

elm-ansi's Introduction

elm-ansi

ANSI text stream handling for Elm.

Usage

Parsing a string of ANSI console output

The Ansi.parse function returns a list of Ansi.Action types which can be used for interpreting escape sequences:

> Ansi.parse "\u{001b}[1;32mhello\u{001b}[0m"
[SetBold True,SetForeground (Just Green),Print "hello",SetForeground Nothing,SetBackground Nothing,SetBold False,SetFaint False,SetItalic False,SetUnderline False,SetBlink False,SetInverted False,SetFraktur False,SetFramed False]
    : List Ansi.Action

The Ansi.parseInto function calls a helper function while parsing to avoid the intermediate data structure.

Rendering ANSI console output as HTML

The Ansi.Log module provides a component for incrementally parsing String chunks and maintaining a Model that can be rendered as HTML.

It exports the usual init, update, view along with Model and other types to assist with rendering, should you want to bring your own view function. A viewLine function is also exported should you want to re-use that aspect within your own view.

elm-ansi's People

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patrickdet joshzarrabi evanphx hfinucane evanradcliffe aoldershaw

elm-ansi's Issues

Great Module but could you provide some examples

Unfortunately I cannot see some colors, bold and italic work, but colors are only encoded in the classes. Do I have to add some css externally ...

THX in advance

inspec's "green" output displays as flashing red

As a more minimal test case, try printf '\033[38;5;41m hello world\033[0m\n' or this concourse task-

---
platform: linux

run:
  path: /usr/local/bin/bash
  args: ['-c', "printf '\\033[38;5;41m hello world\\033[0m\\n'"]

image_resource:
  type: docker-image
  source:
    repository: bash

in the Concourse discord, vito indicated it was probably 256-bit color related-

vito: @hfinucane you can open a bug on https://github.com/vito/elm-ansi - looks like it's missing 256-color support

Related tickets: inspec/inspec#1700 jenkinsci/ansicolor-plugin#96

Implement correct handling of ECMA-48 sequences

Problem

'ANSI' color sequences are only a small part of a larger spec. Other unsupported escape sequences should be stripped.

Spec

According to https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda#backward-compatibility this library doesn't implements parsing according to ECMA-48

Since it deals with 7bit vs 8bit escape sequences that is one dense spec...

The relevant section is ^] 8.3.89 OSC - OPERATING SYSTEM COMMAND
Color is part of 8.3.16 CSI - CONTROL SEQUENCE INTRODUCER ^[
Both sequences (and a fair number of other sequences) are ended 8.3.143 ST - STRING TERMINATOR

see concourse/concourse#4318

Inverted with no background color set should set text color to background color somehow

alex@samus:~/workspace/concourse$ echo $'\e[31m\e[7mfoo\e[0m'
foo

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