{"action":"closed","number":2716,"pull_request":{"url":"https://api.github.com/repos/JuliaLang/julia/pulls/2716","id":4900110,"html_url":"https://github.com/JuliaLang/julia/pull/2716","diff_url":"https://github.com/JuliaLang/julia/pull/2716.diff","patch_url":"https://github.com/JuliaLang/julia/pull/2716.patch","issue_url":"https://api.github.com/repos/JuliaLang/julia/issues/2716","number":2716,"state":"closed","locked":false,"title":"Julia CONFIG dictionary (closes #2430)","user":{"login":"vtjnash","id":330950,"avatar_url":"https://avatars.githubusercontent.com/u/330950?v=3","gravatar_id":"","url":"https://api.github.com/users/vtjnash","html_url":"https://github.com/vtjnash","followers_url":"https://api.github.com/users/vtjnash/followers","following_url":"https://api.github.com/users/vtjnash/following{/other_user}","gists_url":"https://api.github.com/users/vtjnash/gists{/gist_id}","starred_url":"https://api.github.com/users/vtjnash/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/vtjnash/subscriptions","organizations_url":"https://api.github.com/users/vtjnash/orgs","repos_url":"https://api.github.com/users/vtjnash/repos","events_url":"https://api.github.com/users/vtjnash/events{/privacy}","received_events_url":"https://api.github.com/users/vtjnash/received_events","type":"User","site_admin":false},"body":"I figure the only way to get Jeff to comment on #2430 was to submit the code for it as a pull request. So this creates a CONFIG dictionary for arbitrary configuration parameters.\r\n\r\nAnd assign configuration entries simply:\r\n```julia\r\nCONFIG[\"answer_color\"] = \"green\"\r\n```\r\n\r\nThe user can also see the current bindings:\r\n```julia\r\nshow(CONFIG)\r\n```\r\n```\r\nJulia Configuration:\r\nOUTPUT_STREAM = TTY(connected,0 bytes waiting)\r\nanswer_color = \"\\e[1m\"\r\ngfx/backend = \"gtk\"\r\ninput_color = \"\\e[1m\"\r\n```\r\n\r\nThe standard usage of this would be to provide default values for any configuration items in the dictionary:\r\n```julia\r\nCONFIG[\"answer_color\", :default] = \"blue\"\r\n````\r\n\r\nDeleting those values resets the value to the default:\r\n```julia\r\ndelete!(CONFIG,\"answer_color\") #CONFIG[\"answer_color\"] is reset to default (blue)\r\n```\r\n\r\nOther parameters can be deleted too as follows:\r\n```\r\ndelete!(CONFIG,\"answer_color\", :default, :value, :getter, :setter, :delete, :entry)\r\n```\r\n\r\nThe CONFIG object supports getter, setter, and delete notification methods. Here's an example from Base that uses a getter method to create compatibility with the old environment variables and converting the input color through the text_colors mapping:\r\n```julia\r\nCONFIG[\"answer_color\", :default, :getter] =\r\n    (default_color_answer,\r\n    (key,value)->get(text_colors,symbol(get(ENV, \"JULIA_ANSWER_COLOR\", value)),value))\r\nCONFIG[\"input_color\", :default, :getter] =\r\n    (default_color_input,\r\n    (key,value)->get(text_colors,symbol(get(ENV, \"JULIA_INPUT_COLOR\", value)),value))\r\n```\r\n\r\nHere's another example from Base at using a setter method to react to changes in the value:\r\n```julia\r\nCONFIG[\"OUTPUT_STREAM\", :default, :setter] =\r\n    (STDOUT,\r\n    (key,value,hadvalue,newvalue::IO) -> global OUTPUT_STREAM = newvalue)\r\n```\r\nNote that the setter will be called whenever the value is changed, including after a value is deleted (and reverted to default) and right after installing the 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