Weave.jl/src/run.jl

"""
`run(doc::WeaveDoc; doctype = :auto, plotlib="Gadfly",
        out_path=:doc, fig_path = "figures", fig_ext = nothing,
        cache_path = "cache", cache = :off)`

Run code chunks and capture output from parsed document.

* `doctype`: :auto = set based on file extension or specify one of the supported formats.
  See `list_out_formats()`
* `plotlib`: `"PyPlot"`, `"Gadfly"`, or `"Winston"`
* `out_path`: Path where the output is generated. Can be: `:doc`: Path of the source document, `:pwd`: Julia working directory,
  `"somepath"`: Path as a AbstractString e.g `"/home/mpastell/weaveout"`
* `fig_path`: where figures will be generated, relative to out_path
* `fig_ext`: Extension for saved figures e.g. `".pdf"`, `".png"`. Default setting depends on `doctype`.
* `cache_path`: where of cached output will be saved.
* `cache`: controls caching of code: `:off` = no caching, `:all` = cache everything,
 `:user` = cache based on chunk options, `:refresh`, run all code chunks and save new cache.

**Note:** Run command from terminal and not using IJulia, Juno or ESS, they tend to mess with capturing output.
"""
function Base.run(doc::WeaveDoc; doctype = :auto, plotlib="Gadfly",
        out_path=:doc, fig_path = "figures", fig_ext = nothing,
        cache_path = "cache", cache = :off)
    #cache :all, :user, :off, :refresh

    doc.cwd = get_cwd(doc, out_path)
    doctype == :auto && (doctype = detect_doctype(doc.source))
    doc.doctype = doctype

    doc.format = formats[doctype]
    set_rc_params(doc.format.formatdict, fig_path, fig_ext)


    #New sandbox for each document
    sandbox = "ReportSandBox$(rcParams[:doc_number])"
    eval(parse("module $sandbox\nend"))
    SandBox = eval(parse(sandbox))
    rcParams[:doc_number] += 1

    init_plotting(plotlib)
    report = Report(doc.cwd, doc.basename, doc.format.formatdict)
    pushdisplay(report)

    if cache != :off && cache != :refresh
        cached = read_cache(doc, cache_path)
        cached == nothing && info("No cached results found, running code")
    else
        cached = nothing
    end

    executed = Any[]
    n = length(doc.chunks)

    for i = 1:n
        chunk = doc.chunks[i]

        if typeof(chunk) == CodeChunk
            options = merge(rcParams[:chunk_defaults], chunk.options)
            merge!(chunk.options, options)
        end

        restore = (cache ==:user && typeof(chunk) == CodeChunk && chunk.options[:cache])

        if cached != nothing && (cache == :all || restore)
            result_chunks = restore_chunk(chunk, cached)
        else
            result_chunks = run_chunk(chunk, report, SandBox)
        end
        executed = [executed; result_chunks]
    end


    popdisplay(report)

    #Clear variables from used sandbox
    clear_sandbox(SandBox)
    doc.chunks = executed

    if cache != :off
        write_cache(doc, cache_path)
    end

    return doc
end

"""Detect the output format based on file extension"""
function detect_doctype(source::AbstractString)
  ext = lowercase(splitext(source)[2])
  ext == ".jl" && return "md2html"
  contains(ext, "md") && return "md2html"
  contains(ext, "rst") && return "rst"
  contains(ext, "tex") && return "texminted"
  contains(ext, "txt") && return "asciidoc"

  return "pandoc"
end


function run_chunk(chunk::CodeChunk, report::Report, SandBox::Module)
    result_chunk = eval_chunk(chunk, report, SandBox)
end

function run_chunk(chunk::DocChunk, report::Report, SandBox::Module)
    return chunk
end

function reset_report(report::Report)
    report.cur_result = ""
    report.figures = AbstractString[]
    report.term_state = :text
end

function run_code(chunk::CodeChunk, report::Report, SandBox::Module)
    expressions = parse_input(chunk.content)
    #@show expressions
    result_no = 1
    results = ChunkOutput[ ]

    for (str_expr, expr) = expressions
        reset_report(report)
        (obj, out) = capture_output(expr, SandBox, chunk.options[:term], rcParams[:plotlib])
        displayed = report.cur_result #Not needed?
        figures = report.figures #Captured figures
        result = ChunkOutput(str_expr, out, displayed, figures)
        push!(results, result)
    end

    #Save figures only in the end of chunk for PyPlot
    if rcParams[:plotlib] == "PyPlot"
        savefigs_pyplot(report::Report)
    end

    return results
end

function capture_output(expr::Expr, SandBox::Module, term, plotlib)
    oldSTDOUT = STDOUT
    out = nothing
    obj = nothing
    rw, wr = redirect_stdout()
    try
        obj = eval(SandBox, expr)
         if term
            obj != nothing && display(obj)
        elseif plotlib == "Gadfly" && typeof(obj) == Gadfly.Plot
            obj != nothing && display(obj)
        elseif plotlib == "Plots" && issubtype(typeof(obj), Plots.Plot)
            obj != nothing && display(obj)
        end

    finally
        redirect_stdout(oldSTDOUT)
        close(wr)
        out = @compat readstring(rw)
        close(rw)
    end
    return (obj, out)
end


#Parse chunk input to array of expressions
function parse_input(input::AbstractString)
    parsed = Tuple{AbstractString, Expr}[]
    n = length(input)
    pos = 2 #The first character is extra line end
    while pos < n
        oldpos = pos
        code,  pos = parse(input, pos)
        push!(parsed, (input[oldpos:pos-1] , code ))
    end
    parsed
end


function eval_chunk(chunk::CodeChunk, report::Report, SandBox::Module)
    info("Weaving chunk $(chunk.number) from line $(chunk.start_line)")

    if !chunk.options[:eval]
        chunk.output = ""
        chunk.options[:fig] = false
        return chunk
    end

    report.fignum = 1
    report.cur_chunk = chunk

    if haskey(report.formatdict, :out_width) && chunk.options[:out_width] == nothing
        chunk.options[:out_width] = report.formatdict[:out_width]
    end

    chunk.result = run_code(chunk, report, SandBox)
    if chunk.options[:term]
        chunks = collect_results(chunk, TermResult())
    elseif chunk.options[:hold]
        chunks = collect_results(chunk, CollectResult())
    else
        chunks = collect_results(chunk, ScriptResult())
    end

      #else
     #   chunk.options[:fig] && (chunk.figures = copy(report.figures))
    #end

    chunks
end


#function eval_chunk(chunk::DocChunk, report::Report, SandBox)
#    chunk
#end

#Set all variables to nothing
function clear_sandbox(SandBox::Module)
    for name = names(SandBox, true)
        if name != :eval && name != names(SandBox)[1]
            try eval(SandBox, parse(AbstractString(AbstractString(name), "=nothing"))) end
        end
    end
end


function get_figname(report::Report, chunk; fignum = nothing)
    figpath = joinpath(report.cwd, chunk.options[:fig_path])
    isdir(figpath) || mkpath(figpath)
    ext = chunk.options[:fig_ext]
    fignum == nothing && (fignum = report.fignum)

    chunkid = (chunk.options[:name] == nothing) ? chunk.number : chunk.options[:name]
    full_name = joinpath(report.cwd, chunk.options[:fig_path],
    "$(report.basename)_$(chunkid)_$(fignum)$ext")
    rel_name = "$(chunk.options[:fig_path])/$(report.basename)_$(chunkid)_$(fignum)$ext" #Relative path is used in output
    return full_name, rel_name
end


function init_plotting(plotlib)
    if plotlib == nothing
        rcParams[:chunk_defaults][:fig] = false
        rcParams[:plotlib] = nothing
    else
        l_plotlib = lowercase(plotlib)
        rcParams[:chunk_defaults][:fig] = true

        if l_plotlib == "winston"
            eval(parse("""include(Pkg.dir("Weave","src","winston.jl"))"""))
            rcParams[:plotlib] = "Winston"
        elseif l_plotlib == "pyplot"
            eval(parse("""include(Pkg.dir("Weave","src","pyplot.jl"))"""))
            rcParams[:plotlib] = "PyPlot"
        elseif l_plotlib == "gadfly"
            eval(parse("""include(Pkg.dir("Weave","src","gadfly.jl"))"""))
            rcParams[:plotlib] = "Gadfly"
      elseif l_plotlib == "plots"
          eval(parse("""include(Pkg.dir("Weave","src","plotsjl.jl"))"""))
          rcParams[:plotlib] = "Plots"
      end
    end
    return nothing
end

function get_cwd(doc::WeaveDoc, out_path)
    #Set the output directory
    if out_path == :doc
        cwd = doc.path
    elseif out_path == :pwd
        cwd = pwd()
    else
        #If there is no extension, use as path
        splitted = splitext(out_path)
        if splitted[2] == ""
            cwd = expanduser(out_path)
        else
            cwd = splitdir(expanduser(out_path))[1]
        end
    end
    return cwd
end


"""Get output file name based on out_path"""
function get_outname(out_path::Symbol, doc::WeaveDoc; ext = nothing)
    ext == nothing && (ext = doc.format.formatdict[:extension])
    outname = "$(doc.cwd)/$(doc.basename).$ext"
end


"""Get output file name based on out_path"""
function get_outname(out_path::AbstractString, doc::WeaveDoc; ext = nothing)
    ext == nothing && (ext = doc.format.formatdict[:extension])
    splitted = splitext(out_path)
    if (splitted[2]) == ""
        outname = "$(doc.cwd)/$(doc.basename).$ext"
    else
        outname = expanduser(out_path)
    end
end


function set_rc_params(formatdict, fig_path, fig_ext)
    if fig_ext == nothing
        rcParams[:chunk_defaults][:fig_ext] = formatdict[:fig_ext]
        docParams[:fig_ext] = formatdict[:fig_ext]
    else
        rcParams[:chunk_defaults][:fig_ext] = fig_ext
        docParams[:fig_ext] = fig_ext
    end
        rcParams[:chunk_defaults][:fig_path] = fig_path
        docParams[:fig_path] = fig_path
    return nothing
end

function collect_results(chunk::CodeChunk, fmt::ScriptResult)
    content = ""
    result_no = 1
    result_chunks = CodeChunk[ ]
    for r = chunk.result
        if strip(r.stdout) == "" && isempty(r.figures)  && r.displayed == ""
            content *= r.code
        else
            content = "\n" * content * r.code
            rchunk = CodeChunk(content, chunk.number, chunk.start_line, chunk.optionstring, copy(chunk.options))
            content = ""
            rchunk.result_no = result_no
            result_no *=1
            rchunk.figures = r.figures
            rchunk.output = r.stdout * r.displayed
            push!(result_chunks, rchunk)
        end
    end
    if content != ""
        startswith(content, "\n") || (content = "\n" * content)
        rchunk = CodeChunk(content, chunk.number, chunk.start_line, chunk.optionstring, copy(chunk.options))
        push!(result_chunks, rchunk)
    end

    return result_chunks
end

function collect_results(chunk::CodeChunk, fmt::TermResult)
    output = ""
    result_no = 1
    prompt = "\njulia> "
    result_chunks = CodeChunk[ ]
    for r =chunk.result
        output *= prompt * r.code
        output *=  r.displayed * r.stdout
        if !isempty(r.figures)
            rchunk = CodeChunk("", chunk.number, chunk.start_line, chunk.optionstring, copy(chunk.options))
            rchunk.output = output
            output = ""
            rchunk.figures = r.figures
            push!(result_chunks, rchunk)
        end
    end
    if output != ""
         rchunk = CodeChunk("", chunk.number, chunk.start_line, chunk.optionstring, copy(chunk.options))
         rchunk.output = output
        push!(result_chunks, rchunk)
    end

    return result_chunks
end

function collect_results(chunk::CodeChunk, fmt::CollectResult)
    result_no = 1
    for r =chunk.result
        chunk.output *=  r.stdout
        chunk.figures = [chunk.figures; r.figures]
    end

    return [chunk]
end