Make the new fs.getFree/mkfs dependent on build flags (not enough space in most normal Espruino builds)

Author: gfwilliams

README_BuildProcess.md

@@ -150,6 +150,8 @@ This is a partial list of definitions that can be added in a `BOARD.py` file's `
 * `ESPR_TERMNINAL_NO_SCROLL` - disable scrolling in the onscreen terminal (once we get to the end, we just clear the screen and start at the top)
 * `ESPR_HAS_BOOTLOADER_UF2` - nRF5x: Allow entering UF2 bootloader mode by calling E.rebootToDFU()
 * `ESPR_BLE_PRIVATE_ADDRESS_SUPPORT` - NRF52: Enable support for using a random private BLE address, that automatically changes at a set interval. See the `privacy` option that can be passed to `NRF.setSecurity()`.
+* `ESPR_FS_MKFS` - Add support for require("fs").mkfs for formatting disks
+* `ESPR_FS_GETFREE` - Add support for require("fs").getFree in the filesystem library
 
 
 There are some specifically that are useful for cutting a few bytes out of the build:

boards/PIPBOY.py

@@ -43,6 +43,7 @@
      'DEFINES+=-DUSE_FONT_6X8 -DGRAPHICS_PALETTED_IMAGES -DGRAPHICS_ANTIALIAS -DESPR_PBF_FONTS -DESPR_GRAPHICS_INTERNAL -DESPR_GRAPHICS_SELF_INIT -DESPR_GRAPHICS_NO_SPLASH -DGRAPHICS_FAST_PATHS',
      'DEFINES+=-DESPR_SDIO_FAST_UNALIGNED',  # see sdio_diskio.c - this is a nasty hack to increase unaligned read speed
      'DEFINES+=-DLCD_ORIENTATION_LANDSCAPE',
+     'DEFINES+=-DESPR_FS_MKFS -DESPR_FS_GETFREE',
      'DEFINES+=-DUSE_AUDIO_CODEC',
      'DEFINES+=-DESPR_DELAY_MULTIPLIER=28672', # don't work out what to use for jshDelayMicroseconds at boot, just hard-code it
      'DEFINES+=-DESPR_RTC_INITIALISE_TICKS=30', # 168Mhz so we need to wait more ticks for the RTC to init (21->2s doesn't seem to be enough - this is nearer 3s!)

libs/filesystem/jswrap_fs.c

@@ -382,7 +382,7 @@ JsVar *jswrap_fs_stat(JsVar *path) {
   "type" : "staticmethod",
   "class" : "fs",
   "name" : "getFree",
-  "ifndef" : "SAVE_ON_FLASH",
+  "ifdef" : "ESPR_FS_GETFREE",
   "generate" : "jswrap_fs_getfree",
   "params" : [
     ["path","JsVar","The path specifying the logical drive"]
@@ -492,7 +492,7 @@ bool jswrap_fs_mkdir(JsVar *path) {
   "type" : "staticmethod",
   "class" : "fs",
   "name" : "mkfs",
-  "ifndef" : "SAVE_ON_FLASH",
+  "ifdef" : "ESPR_FS_MKFS",
   "generate" : "jswrap_fs_mkfs",
   "return" : ["bool","True on success, or false on failure"]
 }