Additional file extension support

[clach04]

For example .md files for text files in Markdown format. Does not imply any sort of Markdown functionality but should be able to:

• See filename
• open for viewing
• open for editing/save
• search and include in results.

Related #1 for additional/alternative encryption formats.

TEST build https://github.com/clach04/tombo/releases/tag/2.0b5_md_file_extension_test
New files and renaming (titles) results in new filename ending in .txt.

[clach04]

GitHub code search appears to be broken and only shows one line change https://github.com/search?q=repo%3Aclach04%2Ftombo+.txt+language%3AC%2B%2B&type=code&l=C%2B%2B,

tombo/Src/RepositoryImpl.cpp

Line 379 in 4edfdd9

if (_tcsicmp(p, TEXT(".txt")) == 0 ||

However

tombo/Src/MemoNote.cpp

Line 501 in 4edfdd9

if (_tcsicmp(p, TEXT(".txt")) == 0) {

Not a goal, changing default likely

tombo/Src/MemoNote.cpp

Line 246 in 4edfdd9

return TEXT(".txt");

C:\code\c\tombo>rg \".txt\"
Src\RepositoryImpl.cpp
379:                    if (_tcsicmp(p, TEXT(".txt")) == 0 ||

Src\MemoNote.cpp
188:    if (!GetHeadLinePath(pTopDir, sMemoDir.Get(), sHeadLine.Get(), TEXT(".txt"),
246:    return TEXT(".txt");
501:    if (_tcsicmp(p, TEXT(".txt")) == 0) {

iOS\Tombo\Tombo\Storage.m
335:    [newPath appendString:@".txt"];

[clach04]

Turns out there is a lot of code that makes the assumption file extensions are 4 bytes, ".ABC" does an efficient subtract 4 math on filenames. Supporting less than 4 bytes (including period/dot) will require changes in a few different places and support for either finding the right-most "." rindex() / strrchr() or right-most (backwards) string compare.

NOTE case sensitive.

[clach04]

Posted test build https://github.com/clach04/tombo/releases/tag/2.0b5_md_file_extension_test