├── README.md
├── detectindent.lua
├── help
    └── detectindent.md
└── repo.json


/README.md:
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1 | # Detectindent plugin for Micro text editor
2 | 
3 | Whenever a file is opened, the detectindent plugin tries to automatically detect its indentation style (spaces or tabs) and set the `tabstospaces` option accordingly. If spaces indentation is detected, it also tries to detect the indentation width and set the `tabsize` option accordingly.
4 | 


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/detectindent.lua:
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 1 | VERSION = "1.1.1"
 2 | 
 3 | local config = import("micro/config")
 4 | local util = import("micro/util")
 5 | 
 6 | function onBufferOpen(buf)
 7 |     local spaces, tabs = 0, 0
 8 |     local space_count, prev_space_count = 0, 0
 9 |     local tabsizes = {}
10 |     local i = 0
11 |     while spaces + tabs < 500 and i < 1000 and i < buf:LinesNum() do
12 |         space_count = 0
13 |         local line = buf:Line(i)
14 |         local r = util.RuneAt(line, 0)
15 |         if r == " " then
16 |             space_count = string.len(util.GetLeadingWhitespace(line))
17 |             -- for tab vs space detection, ignore space indents of 1
18 |             --  which can be a false signal from C-style block comments
19 |             if space_count > 1 then
20 |                 spaces = spaces + 1
21 |             end
22 | 
23 |             -- treat whitespace-only lines as not changing the indent
24 |             if string.len(line) == space_count then
25 |                 space_count = prev_space_count
26 |             end
27 |             -- look for an increasing number of spaces, ignoring increases of 1
28 |             --  which can be a false signal from C-style block comments
29 |             if space_count > prev_space_count + 1 then
30 |                 local t = space_count - prev_space_count
31 |                 if tabsizes[t] == nil then
32 |                     tabsizes[t] = 1
33 |                 else
34 |                     tabsizes[t] = tabsizes[t] + 1
35 |                 end
36 |             end
37 |         elseif r == "\t" then
38 |             tabs = tabs + 1
39 |             -- treat tabbed lines as not affecting spaced indentation
40 |             space_count = prev_space_count
41 |         elseif r == "" then
42 |             -- treat empty lines as not changing the indent
43 |             space_count = prev_space_count
44 |         end
45 |         prev_space_count = space_count
46 |         i = i + 1
47 |     end
48 | 
49 |     if spaces > tabs then
50 |         buf:SetOptionNative("tabstospaces", true)
51 |         -- get the indentation change used for the largest number of lines
52 |         local tabsize = -1
53 |         local maxcount = 0
54 |         for t, count in pairs(tabsizes) do
55 |             if count > maxcount then
56 |                 maxcount = count
57 |                 tabsize = t
58 |             end
59 |         end
60 |         if tabsize > 0 then
61 |             buf:SetOptionNative("tabsize", tabsize)
62 |         end
63 |     elseif tabs > spaces then
64 |         buf:SetOptionNative("tabstospaces", false)
65 |     end
66 | end
67 | 
68 | function init()
69 |     config.AddRuntimeFile("detectindent", config.RTHelp, "help/detectindent.md")
70 | end
71 | 


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/help/detectindent.md:
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 1 | # Detectindent
 2 | 
 3 | Whenever a file is opened, the detectindent plugin tries to automatically
 4 | detect its indentation style (spaces or tabs) and set the `tabstospaces`
 5 | option accordingly. If spaces indentation is detected, it also tries to
 6 | detect the indentation width and set the `tabsize` option accordingly.
 7 | 
 8 | To disable it, just turn off the plugin:
 9 | 
10 | ```
11 | set detectindent off
12 | ```
13 | 


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/repo.json:
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 1 | [{
 2 |   "Name": "detectindent",
 3 |   "Description": "Automatically detect indentation settings",
 4 |   "Tags": ["indent", "detect"],
 5 |   "Versions": [
 6 |     {
 7 |       "Version": "1.1.1",
 8 |       "Url": "https://github.com/dmaluka/micro-detectindent/archive/v1.1.1.zip",
 9 |       "Require": {
10 |         "micro": ">=2.0.0"
11 |       }
12 |     }
13 |   ]
14 | }]
15 | 


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