Add docs

Project.toml

@@ -1,7 +1,7 @@
 name = "JMPReader"
 uuid = "d9f7e686-cf87-4d12-8d7a-0e9b8c9fba29"
 authors = ["Jaakko Ruohio <jaakkor2@gmail.com>"]
-version = "0.1.10"
+version = "0.1.11"
 
 [deps]
 CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"

docs/.gitignore

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+build/
+site/

docs/Project.toml

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+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+JMPReader = "d9f7e686-cf87-4d12-8d7a-0e9b8c9fba29"
+
+[compat]
+Documenter = "1"

docs/src/dev.md

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+## Testing
+
+Basic testing with limited number of files
+```julia
+using Pkg
+Pkg.test("JMPReader")
+```
+
+Utility function `JMPReader.scandir` is provided that scans recursively the argument directory.
+For example,
+```julia
+JMPReader.scandir(joinpath(pathof(JMPReader), "..", "..", "test"))
+```
+reads 12 JMP-files, and
+```julia
+JMPReader.scandir(raw"C:\Program Files\SAS\JMPPRO\17\Samples\Data")
+```
+reads successfully 605 JMP-files.
+
+## Looking into the binary .jmp file
+
+### Finding strings
+
+Location of strings in the binary `.jmp` can be found using a snippet like
+```julia
+fn = joinpath(pathof(JMPReader), "..", "..", "test", "example1.jmp")
+raw = read(fn)
+seq = reinterpret(UInt8, codeunits("jäääär"))
+findall(seq, raw)
+```
+returns
+```
+1-element Vector{UnitRange{Int64}}:
+ 1986:1995
+```
+
+Hex editor can be useful, for example [Hex Editor for VS Code](https://github.com/microsoft/vscode-hexeditor).
+
+If string is not found, columns could be GZ compressed.  In that case, see options in JMP File->Preferences.
+
+### Reading columns
+
+This snippet reads the fourth column
+
+```julia
+fn = joinpath(pathof(JMPReader), "..", "..", "test", "example1.jmp")
+io = open(fn)
+info = JMPReader.metadata(io)
+d = JMPReader.column_data(io, info, 4, Vector{UInt8}())
+close(io)
+```

docs/src/index.md

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+# JMPReader.jl Documentation
+
+[JMP](https://en.wikipedia.org/wiki/JMP_(statistical_software)) is commercial statistical software.  This package provides an independent reader for `.jmp` files
+implemented in Julia.
+
+## Basic usage
+
+Basic usage is
+```
+using JMPReader
+fn = joinpath(pathof(JMPReader), "..", "..", "test", "example1.jmp")
+df = readjmp(fn)
+```
+to read file `fn` and get the data as a Julia `DataFrame`.  All columns are included
+```
+4×12 DataFrame
+ Row │ ints  floats   charconstwidth  time                 date        duration              charconstwidth2  charvariable16                     formula  pressures          char utf8  charvariable8
+     │ Int8  Float64  String          DateTime?            Date?       Millisec…             String           String                             String   Float64?           String     String
+─────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
+   1 │    1     11.1  a               1976-04-01T21:12:00  2024-01-13  2322000 milliseconds  a                aa                                 2            101.325        ꙮꙮꙮ        a
+   2 │    2     22.2  b               1984-08-06T23:58:00  2024-01-14  364000 milliseconds   bb               bbbb                               4        missing            🚴💨       bb
+   3 │    3     33.3  c               2003-06-02T17:00:00  missing     229000 milliseconds   ccc              cccccccc                           6              2.6          jäääär     cc
+   4 │    4     44.4  d               missing              2032-02-12  0 milliseconds        dddd             abcdefghijabcdefghijabcdefghijab…  8              4.63309e110  辛口       abcdefghijkl
+```
+
+## Choosing columns
+
+Two keyword arguments are available, `include_columns` and `exclude_columns`
+```
+df = readjmp(fn, include_columns=[2, "date", r"^char"], exclude_columns=[r"varia"])
+``` 
+returns the second column `floats`, a column named `date`, columns that start with `char`,
+but excluding columns whose name contain a string `varia`.
+```
+4×5 DataFrame
+ Row │ floats   charconstwidth  date        charconstwidth2  char utf8
+     │ Float64  String          Date?       String           String
+─────┼─────────────────────────────────────────────────────────────────
+   1 │    11.1  a               2024-01-13  a                ꙮꙮꙮ
+   2 │    22.2  b               2024-01-14  bb               🚴💨
+   3 │    33.3  c               missing     ccc              jäääär
+   4 │    44.4  d               2032-02-12  dddd             辛口
+```