{"action":"created","comment":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/78483350","id":78483350,"diff_hunk":"@@ -57,31 +57,33 @@ mimewritable(m::AbstractString, x) = mimewritable(MIME(m), x)\n # format and is returned unmodified.  This is useful so that raw data can be\n # passed to display(m::MIME, x).\n \n+verbose_writemime(io, m, x) = writemime(IOContext(io,multiline=true,limit=false), m, x)","path":"base/multimedia.jl","position":4,"original_position":4,"commit_id":"0c3147e9526279ee1ec51b591c448a8ee73d8331","original_commit_id":"0c3147e9526279ee1ec51b591c448a8ee73d8331","user":{"login":"stevengj","id":2913679,"avatar_url":"https://avatars.githubusercontent.com/u/2913679?v=3","gravatar_id":"","url":"https://api.github.com/users/stevengj","html_url":"https://github.com/stevengj","followers_url":"https://api.github.com/users/stevengj/followers","following_url":"https://api.github.com/users/stevengj/following{/other_user}","gists_url":"https://api.github.com/users/stevengj/gists{/gist_id}","starred_url":"https://api.github.com/users/stevengj/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stevengj/subscriptions","organizations_url":"https://api.github.com/users/stevengj/orgs","repos_url":"https://api.github.com/users/stevengj/repos","events_url":"https://api.github.com/users/stevengj/events{/privacy}","received_events_url":"https://api.github.com/users/stevengj/received_events","type":"User","site_admin":false},"body":"Note that this led to JuliaLang/IJulia.jl#462\r\n\r\nIt's not a big deal; in hindsight, I'm not sure the whole `stringmime` function belongs in Base anyway.  It should be easy enough to implement a `limitstringmime` in IJulia.","created_at":"2016-09-13T01:23:48Z","updated_at":"2016-09-13T01:23:48Z","html_url":"https://github.com/JuliaLang/julia/pull/16354#discussion_r78483350","pull_request_url":"https://api.github.com/repos/JuliaLang/julia/pulls/16354","_links":{"self":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/comments/78483350"},"html":{"href":"https://github.com/JuliaLang/julia/pull/16354#discussion_r78483350"},"pull_request":{"href":"https://api.github.com/repos/JuliaLang/julia/pulls/16354"}}},"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/16354","id":70055528,"html_url":"https://github.com/JuliaLang/julia/pull/16354","diff_url":"https://github.com/JuliaLang/julia/pull/16354.diff","patch_url":"https://github.com/JuliaLang/julia/pull/16354.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/16354","number":16354,"state":"closed","locked":false,"title":"RFC: use IOContext more consistently. part of #14052","user":{"login":"JeffBezanson","id":744556,"avatar_url":"https://avatars.githubusercontent.com/u/744556?v=3","gravatar_id":"","url":"https://api.github.com/users/JeffBezanson","html_url":"https://github.com/JeffBezanson","followers_url":"https://api.github.com/users/JeffBezanson/followers","following_url":"https://api.github.com/users/JeffBezanson/following{/other_user}","gists_url":"https://api.github.com/users/JeffBezanson/gists{/gist_id}","starred_url":"https://api.github.com/users/JeffBezanson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/JeffBezanson/subscriptions","organizations_url":"https://api.github.com/users/JeffBezanson/orgs","repos_url":"https://api.github.com/users/JeffBezanson/repos","events_url":"https://api.github.com/users/JeffBezanson/events{/privacy}","received_events_url":"https://api.github.com/users/JeffBezanson/received_events","type":"User","site_admin":false},"body":"The whole output thing is difficult to wrap my head around, but I think I found a nice chunk to bite off.\r\n\r\nFirst, `showarray` and `showdict` were undermining IOContext, so they are removed, making the IOContext flags the only thing that controls printing. That fixes e.g. #13710. It might also fix #16103 and #16267.\r\n\r\nSecond, some definitions of `writemime` were using it to mean \"how to print in the REPL\", which is not correct. Those needed to be removed in preparation for merging `show` and `writemime`. Instead I added an `:interactive` flag, which picks between e.g. multi-line and single-line display of vectors. REPL display is now done properly, by having the REPL print to an IOContext that sets `:limit_output` and `:interactive`.\r\n\r\nThe next steps are (1) fully merge show and writemime, (2) decide exactly which output flags we need. (2) is harder than I thought. The important variables currently seem to be:\r\n\r\n- Whether collections are truncated\r\n- Whether to use a more compact single-line format, or something better for interactive use\r\n- How many digits of numbers to print, and whether to use the print_shortest algorithm\r\n- How does `summary` fit in? Maybe it doesn't, and can stay a separate 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