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| 1 | -- Configuration API version 2.0 | |
| 2 | ||
| 3 | --[[ | |
| 4 | loads a file into a variable | |
| 5 | usage: cfg.load( string file, bool ext ) | |
| 6 | * "file" determines the file to load | |
| 7 | * "ext" if true excludes adding ".cfg" to the end of the filename | |
| 8 | returns the file, or "false" and the failure reason ("invalid" or "missing") if it fails
| |
| 9 | ]] | |
| 10 | function load( file, ext ) | |
| 11 | if not file then | |
| 12 | error( 'Missing expected args' ) | |
| 13 | return | |
| 14 | end | |
| 15 | local ext = ext and '' or '.cfg' | |
| 16 | local filename = file .. ext | |
| 17 | if not fs.exists( filename ) then | |
| 18 | return false, 'missing' | |
| 19 | end | |
| 20 | local file = fs.open( filename, 'r' ) | |
| 21 | local config = textutils.unserialize( file.readAll() ) | |
| 22 | file.close() | |
| 23 | if not config then | |
| 24 | return false, 'invalid' | |
| 25 | end | |
| 26 | return config | |
| 27 | end | |
| 28 | ||
| 29 | --[[ | |
| 30 | loads a file from a variable | |
| 31 | usage: cfg.save( string file, table config, bool ext ) | |
| 32 | * "file" determines the file to save | |
| 33 | * "config" is the table to save into the file | |
| 34 | * "ext" if true excludes adding ".cfg" to the end of the filename | |
| 35 | returns true if suceeds | |
| 36 | ]] | |
| 37 | function save( file, config, ext ) | |
| 38 | if not file or not config then | |
| 39 | error( 'Missing expected args' ) | |
| 40 | return | |
| 41 | end | |
| 42 | local ext = ext and '' or '.cfg' | |
| 43 | local file = fs.open( file .. ext, 'w' ) | |
| 44 | file.write( textutils.serialize( config ) ) | |
| 45 | file.close() | |
| 46 | return true | |
| 47 | end | |
| 48 | ||
| 49 | --[[ | |
| 50 | write a value to a config file as a key | |
| 51 | usage: cfg.save( string file, any line, any key, bool ext ) | |
| 52 | * "file" determines the file to save | |
| 53 | * "line" is the variable to add to the file | |
| 54 | * "key" is the key to write it to | |
| 55 | * "ext" if true excludes adding ".cfg" to the end of the filename | |
| 56 | returns true if suceeds, or false if the file is invalid | |
| 57 | ]] | |
| 58 | function saveLine( file, line, key, ext ) | |
| 59 | if not file or not line or not key then | |
| 60 | error( 'Missing expected args' ) | |
| 61 | return | |
| 62 | end | |
| 63 | local config, cfgError = load( file, ext ) | |
| 64 | config = config or {}
| |
| 65 | if cfgError == 'invalid' then | |
| 66 | return false | |
| 67 | end | |
| 68 | config[key] = line | |
| 69 | save( file, config, ext ) | |
| 70 | return true | |
| 71 | end |
