[Feature Request] Preview (temporarily apply) colour schemes when the name is highlighted in the list.

[HubKing]

It is very annoying to try each and every colour scheme one by one by typing set colorscheme [name] again and again. It would be much faster and easier if Micro just temporarily switch to the colour theme (preview) when the name is selected like below.

2023-01-10-15-33-19.mp4

[dmaluka]

In principle it should be possible with a simple Lua plugin like the following:

local config = import("micro/config")

local origColorscheme = config.GetGlobalOption("colorscheme")
local tempColorscheme = nil

function onCommandComplete(bp)
    if bp.PromptType == "Command" and bp.Buf:Line(0):match("^set colorscheme ") and
            bp.Buf.HasSuggestions and bp.Buf.CurSuggestion >= 0 then
        tempColorscheme = bp.Buf.Completions[bp.Buf.CurSuggestion + 1]
        config.SetGlobalOption("colorscheme", tempColorscheme)
    end
end

function onExecuteCommand(bp)
    if tempColorscheme ~= nil and tempColorscheme ~= origColorscheme then
        origColorscheme = tempColorscheme
    end
end

function onAbortCommand(bp)
    if tempColorscheme ~= nil and tempColorscheme ~= origColorscheme then
        config.SetGlobalOption("colorscheme", origColorscheme)
        tempColorscheme = nil
    end
end

Unfortunately, as I've found, micro currently executes onAction callbacks only for actions triggered in a normal buffer pane only, not in the command bar, so those onCommandComplete, onExecuteCommand, onAbortCommand functions are never executed (so I cannot even test if the above Lua code is correct). But I think it should not be too difficult to fix this limitation in micro.