Feature request: import hodoku format puzzles
jthornhill opened this issue · comments
OpenSudoku is great and the online puzzle generator is very helpful!
However, if you're trying to learn specific advanced solving techniques, you may want to train on puzzles that you know highlight the technique you are working with. Specifically, Hodoku is a popular generator / solver written in Java which supports generating puzzles specifically for learning.
There exists a Python script to convert these files already (sample files are included in that repo too). It's a pretty straightforward conversion, and that script is pretty simple.
Obviously this means one can already get such puzzles into OpenSudoku :) But, it's not going to be obvious for non-technical users how to do it. Supporting this format natively would be great!
I don't know what format of file generates Hodoku, seems that support sdm, you can import sdm files directly to OpenSudoku
An SDM file is described here but basically is a txt file with each line is a puzzle and zeroes represent empty cells. For example this line
016400000200009000400000062070230100100000003003087040960000005000800007000006820
Are translated to:
016 400 000
200 009 000
400 000 062
070 230 100
100 000 003
003 087 040
960 000 005
000 800 007
000 006 820
If Hodoku exports these files but with txt extension you only have to change the extension to import it in Open Sudoku
I don't know what format of file generates Hodoku, seems that support sdm, you can import sdm files directly to OpenSudoku
An SDM file is described here but basically is a txt file with each line is a puzzle and zeroes represent empty cells. For example this line
016400000200009000400000062070230100100000003003087040960000005000800007000006820
This is really great info, thanks!
The default output of the Hodoku generator (when run on the command line) just looks like a variant of SDM, using . instead of 0, with comments on the end. Like so:
...3.8.4..9352....8..........1..5.796......2....8.1............94.1..3....7.3.65. # ssts bf3(5) x
..7.6314....1....2....98...5.....2..2.....4.66..48....143....9.........3.6.5..... # x bf3(1) x
.98....6....41..5........192...5..3....9.8..2..634...585....39...7.............84 # x bf3(1) x
..4..3.29.7....358............83.6..5......1.8.25....491.2.......3987............ # x bf3(2) x
Just doing s/\./0/g and naming it to the sdm file extension does the trick (I stripped the comments too, but dunno if that was required).
I don't know if there's a spec/reference implementation of the sdm format, but this feature request may really be "support . in addition to 0 as a placeholder in SDM files." The SudoCue docs mention that they support the . in exchange for 0 too, so there may be other generators that do this:
This is a very simple format. Each line contains a single puzzle. The empty cells are represented by a zero, but the program also accepts other placeholders, like a dot “.”. Line breaks in Windows or Unix style are recognized, but when my software writes these files, CrLb is always used. These files cannot be written by SudoCue. The program can only read them.
Done, in next release you will can import a .sdm file that use dots instead of zeros, but you must remove comments since the format doesn't accept it.