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Reimplement Markdown printing using StyledStrings
Using StyledStrings for styled printing has a number of benefits, including but not limited to: - Italics "just working" on terminals that announce support - Functioning links, for the first time - Greater compossibility of rendered markdown content - Customisability of the printing style Then with JuliaSyntaxHighlighting, we get support for syntax-highlighted Julia code too.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,68 +1,68 @@ | ||
| # This file is a part of Julia. License is MIT: https://julialang.org/license | ||
|
|
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| # Wrapping | ||
| const AnnotIO = Union{AnnotatedIOBuffer, IOContext{AnnotatedIOBuffer}} | ||
|
|
||
| function ansi_length(s) | ||
| replace(s, r"\e\[[0-9]+m" => "") |> textwidth | ||
| function annotprint(f::Function, args...) | ||
| buf = AnnotatedIOBuffer() | ||
| f(buf, args...) | ||
| read(seekstart(buf), AnnotatedString) | ||
| end | ||
|
|
||
| words(s) = split(s, " ") | ||
| lines(s) = split(s, "\n") | ||
| """ | ||
| with_output_annotations(f::Function, io::AnnotIO, annots::Pair{Symbol, <:Any}...) | ||
| function wrapped_line(io::IO, s::AbstractString, width, i) | ||
| ws = words(s) | ||
| lines = String[] | ||
| for word in ws | ||
| word_length = ansi_length(word) | ||
| word_length == 0 && continue | ||
| if isempty(lines) || i + word_length + 1 > width | ||
| i = word_length | ||
| if length(lines) > 0 | ||
| last_line = lines[end] | ||
| maybe_underline = findlast(Base.text_colors[:underline], last_line) | ||
| if !isnothing(maybe_underline) | ||
| # disable underline style at end of line if not already disabled. | ||
| maybe_disable_underline = max( | ||
| last(something(findlast(Base.disable_text_style[:underline], last_line), -1)), | ||
| last(something(findlast(Base.text_colors[:normal], last_line), -1)), | ||
| ) | ||
| Call `f(io)`, and apply `annots` to the output created by doing so. | ||
| """ | ||
| function with_output_annotations(f::Function, io::AnnotIO, annots::Pair{Symbol, <:Any}...) | ||
| @nospecialize annots | ||
| aio = if io isa AnnotatedIOBuffer io else io.io end | ||
| start = position(aio) + 1 | ||
| f(io) | ||
| stop = position(aio) | ||
| sortedindex = searchsortedlast(aio.annotations, (start:stop,), by=first) | ||
| for (i, annot) in enumerate(annots) | ||
| insert!(aio.annotations, sortedindex + i, (start:stop, annot)) | ||
| end | ||
| end | ||
|
|
||
| if maybe_disable_underline < 0 || maybe_disable_underline < last(maybe_underline) | ||
| """ | ||
| wraplines(content::AnnotatedString, width::Integer = 80, column::Integer = 0) | ||
| lines[end] = last_line * Base.disable_text_style[:underline] | ||
| word = Base.text_colors[:underline] * word | ||
| end | ||
| Wrap `content` into a vector of lines of at most `width` (according to | ||
| `textwidth`), with the first line starting at `column`. | ||
| """ | ||
| function wraplines(content::Union{Annot, SubString{<:Annot}}, width::Integer = 80, column::Integer = 0) where { Annot <: AnnotatedString} | ||
| s, lines = String(content), SubString{Annot}[] | ||
| i, lastwrap, slen = firstindex(s), 0, ncodeunits(s) | ||
| most_recent_break_opportunity = 1 | ||
| while i < slen | ||
| if isspace(s[i]) && s[i] != '\n' | ||
| most_recent_break_opportunity = i | ||
| elseif s[i] == '\n' | ||
| push!(lines, content[nextind(s, lastwrap):prevind(s, i)]) | ||
| lastwrap = i | ||
| column = 0 | ||
| elseif column >= width && most_recent_break_opportunity > 1 | ||
| if lastwrap == most_recent_break_opportunity | ||
| nextbreak = findfirst(isspace, @view s[nextind(s, lastwrap):end]) | ||
| if isnothing(nextbreak) | ||
| break | ||
| else | ||
| most_recent_break_opportunity = lastwrap + nextbreak | ||
| end | ||
| i = most_recent_break_opportunity | ||
| else | ||
| i = nextind(s, most_recent_break_opportunity) | ||
| end | ||
| push!(lines, word) | ||
| else | ||
| i += word_length + 1 | ||
| lines[end] *= " " * word # this could be more efficient | ||
| push!(lines, content[nextind(s, lastwrap):prevind(s, most_recent_break_opportunity)]) | ||
| lastwrap = most_recent_break_opportunity | ||
| column = 0 | ||
| end | ||
| column += textwidth(s[i]) | ||
| i = nextind(s, i) | ||
| end | ||
| return i, lines | ||
| end | ||
|
|
||
| function wrapped_lines(io::IO, s::AbstractString; width = 80, i = 0) | ||
| ls = String[] | ||
| for ss in lines(s) | ||
| i, line = wrapped_line(io, ss, width, i) | ||
| append!(ls, line) | ||
| if lastwrap < slen | ||
| push!(lines, content[nextind(s, lastwrap):end]) | ||
| end | ||
| return ls | ||
| lines | ||
| end | ||
|
|
||
| wrapped_lines(io::IO, f::Function, args...; width = 80, i = 0) = | ||
| wrapped_lines(io, sprint(f, args...; context=io), width = width, i = 0) | ||
|
|
||
| function print_wrapped(io::IO, s...; width = 80, pre = "", i = 0) | ||
| lines = wrapped_lines(io, s..., width = width, i = i) | ||
| isempty(lines) && return 0, 0 | ||
| print(io, lines[1]) | ||
| for line in lines[2:end] | ||
| print(io, '\n', pre, line) | ||
| end | ||
| length(lines), length(pre) + ansi_length(lines[end]) | ||
| end | ||
|
|
||
| print_wrapped(f::Function, io::IO, args...; kws...) = print_wrapped(io, f, args...; kws...) |
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