~mdw / disorder / blame
| Commit | Line | Data |
|---|---|---|
| 8818b7fc RK |
1 | DisOrder Database Versions |
| 2 | ========================== | |
| 3 | ||
| 4 | If no _dbversion global preference is found then database version 1 is | |
| 5 | assumed. Database versions 2 and above always have a _dbversion | |
| 6 | global preference. | |
| 7 | ||
| 8 | Old database versions can be PARTIALLY emulated for testing purposes | |
| 9 | by setting the undocument dbversion configuration item. Setting it on | |
| 10 | a production system would be a terrible idea. | |
| 11 | ||
| 12 | Database Version 1 | |
| 13 | ------------------ | |
| 14 | ||
| 15 | Path names are in UTF-8, but with no normalization applied: you get | |
| 16 | whatever the filesystem gives you. | |
| 17 | ||
| 18 | Search terms are split according to the old words() function. | |
| 19 | - "/", ".", "+", "&", ":", "_" and "-" are considered to be separators | |
| 20 | - anything in General_Category Cc, Cf, Co, Cs, Zl, Cp, Sz, Pe or Ps | |
| 21 | is considered to be a separator | |
| 22 | - anything else in General_Category Ll, Lm, Lo, Lt, Lu, Nd, Nl, No, | |
| 23 | Sc, Sk, Sm or So is considered to be part of a word | |
| 24 | - everything else is ignored | |
| 25 | ||
| 26 | Search terms are case-folded by applying the CaseFolding.txt mapping, | |
| 27 | without any attempt at normalization. | |
| 28 | ||
| 29 | Database Version 2 | |
| 30 | ------------------ | |
| 31 | ||
| 32 | Path names are in UTF-8, normalized to NFC. | |
| 33 | ||
| 34 | Search terms are split according to the default Unicode word boundary | |
| 35 | detection algorithm. | |
| 36 | ||
| 37 | Search terms are case-folded using the Unicode case-folding algorithm, | |
| 38 | normalizing to NFKD. | |
| 39 | ||
| 40 | Things that haven't been done yet: | |
| 41 | - undump support for new dbversion | |
| 42 | - automatic upgrade from dbversion 1 |