vi: add fileformats option

Add a limited version of the 'fileformats' option.  Only the
'dos,unix' and 'unix,dos' settings are allowed with the former
as default.

When a file is read for editing its format is detected.  If it
only has LF line endings it's treated as being of type 'unix'
otherwise its type is 'dos'.

When an empty edit buffer is created it's given the first file
type listed in 'fileformats'.

The file type is stored in the read-only option 'fileformat'
and is used to select the appropriate line endings when the
file is written.

See GitHub issue #220.  Adds 168 bytes to the binary.

2 files changed, 22 insertions, 14 deletions

diff --git a/configs/mingw32_defconfig b/configs/mingw32_defconfig
index d9466af1d..179af2f67 100644
--- a/configs/mingw32_defconfig
+++ b/configs/mingw32_defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Busybox version: 1.34.0.git
-# Sat Jul 24 10:37:11 2021
+# Busybox version: 1.35.0.git
+# Mon Aug 30 08:54:18 2021
 #
 CONFIG_HAVE_DOT_CONFIG=y
 # CONFIG_PLATFORM_POSIX is not set
@@ -226,11 +226,13 @@ CONFIG_CHMOD=y
 # CONFIG_FEATURE_CHOWN_LONG_OPTIONS is not set
 # CONFIG_CHROOT is not set
 CONFIG_CKSUM=y
+CONFIG_CRC32=y
 CONFIG_COMM=y
 CONFIG_CP=y
 CONFIG_FEATURE_CP_LONG_OPTIONS=y
 # CONFIG_FEATURE_CP_REFLINK is not set
 CONFIG_CUT=y
+CONFIG_FEATURE_CUT_REGEX=y
 CONFIG_DATE=y
 CONFIG_FEATURE_DATE_ISOFMT=y
 # CONFIG_FEATURE_DATE_NANO is not set
@@ -354,10 +356,10 @@ CONFIG_BASE64=y
 CONFIG_UUENCODE=y
 CONFIG_WC=y
 CONFIG_FEATURE_WC_LARGE=y
-CONFIG_WHOAMI=y
 # CONFIG_WHO is not set
 # CONFIG_W is not set
 # CONFIG_USERS is not set
+CONFIG_WHOAMI=y
 CONFIG_YES=y
 
 #
@@ -446,6 +448,7 @@ CONFIG_FEATURE_VI_REGEX_SEARCH=y
 CONFIG_FEATURE_VI_DOT_CMD=y
 CONFIG_FEATURE_VI_READONLY=y
 CONFIG_FEATURE_VI_SETOPTS=y
+CONFIG_FEATURE_VI_FILE_FORMAT=y
 CONFIG_FEATURE_VI_SET=y
 CONFIG_FEATURE_VI_WIN_RESIZE=y
 # CONFIG_FEATURE_VI_ASK_TERMINAL is not set
@@ -530,10 +533,10 @@ CONFIG_INIT_TERMINAL_TYPE=""
 # CONFIG_USE_BB_SHADOW is not set
 # CONFIG_USE_BB_CRYPT is not set
 # CONFIG_USE_BB_CRYPT_SHA is not set
-# CONFIG_ADDGROUP is not set
-# CONFIG_FEATURE_ADDUSER_TO_GROUP is not set
 # CONFIG_ADD_SHELL is not set
 # CONFIG_REMOVE_SHELL is not set
+# CONFIG_ADDGROUP is not set
+# CONFIG_FEATURE_ADDUSER_TO_GROUP is not set
 # CONFIG_ADDUSER is not set
 # CONFIG_FEATURE_CHECK_NAMES is not set
 CONFIG_LAST_ID=0
@@ -752,6 +755,7 @@ CONFIG_REV=y
 # Miscellaneous Utilities
 #
 # CONFIG_ADJTIMEX is not set
+CONFIG_ASCII=y
 # CONFIG_BBCONFIG is not set
 # CONFIG_FEATURE_COMPRESS_BBCONFIG is not set
 CONFIG_BC=y
@@ -785,10 +789,10 @@ CONFIG_FEATURE_CROND_DIR=""
 # CONFIG_FEATURE_DEVFS is not set
 # CONFIG_DEVMEM is not set
 # CONFIG_FBSPLASH is not set
-# CONFIG_FLASHCP is not set
 # CONFIG_FLASH_ERASEALL is not set
 # CONFIG_FLASH_LOCK is not set
 # CONFIG_FLASH_UNLOCK is not set
+# CONFIG_FLASHCP is not set
 # CONFIG_HDPARM is not set
 # CONFIG_FEATURE_HDPARM_GET_IDENTITY is not set
 # CONFIG_FEATURE_HDPARM_HDIO_SCAN_HWIF is not set
@@ -839,13 +843,13 @@ CONFIG_STRINGS=y
 CONFIG_TIME=y
 CONFIG_TS=y
 CONFIG_TTYSIZE=y
-# CONFIG_UBIRENAME is not set
 # CONFIG_UBIATTACH is not set
 # CONFIG_UBIDETACH is not set
 # CONFIG_UBIMKVOL is not set
 # CONFIG_UBIRMVOL is not set
 # CONFIG_UBIRSVOL is not set
 # CONFIG_UBIUPDATEVOL is not set
+# CONFIG_UBIRENAME is not set
 # CONFIG_VOLNAME is not set
 # CONFIG_WATCHDOG is not set
 # CONFIG_FEATURE_WATCHDOG_OPEN_TWICE is not set
diff --git a/configs/mingw64_defconfig b/configs/mingw64_defconfig
index ef1ba4e22..f9be9aab2 100644
--- a/configs/mingw64_defconfig
+++ b/configs/mingw64_defconfig
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Busybox version: 1.34.0.git
-# Sat Jul 24 10:37:11 2021
+# Busybox version: 1.35.0.git
+# Mon Aug 30 08:54:18 2021
 #
 CONFIG_HAVE_DOT_CONFIG=y
 # CONFIG_PLATFORM_POSIX is not set
@@ -226,11 +226,13 @@ CONFIG_CHMOD=y
 # CONFIG_FEATURE_CHOWN_LONG_OPTIONS is not set
 # CONFIG_CHROOT is not set
 CONFIG_CKSUM=y
+CONFIG_CRC32=y
 CONFIG_COMM=y
 CONFIG_CP=y
 CONFIG_FEATURE_CP_LONG_OPTIONS=y
 # CONFIG_FEATURE_CP_REFLINK is not set
 CONFIG_CUT=y
+CONFIG_FEATURE_CUT_REGEX=y
 CONFIG_DATE=y
 CONFIG_FEATURE_DATE_ISOFMT=y
 # CONFIG_FEATURE_DATE_NANO is not set
@@ -354,10 +356,10 @@ CONFIG_BASE64=y
 CONFIG_UUENCODE=y
 CONFIG_WC=y
 CONFIG_FEATURE_WC_LARGE=y
-CONFIG_WHOAMI=y
 # CONFIG_WHO is not set
 # CONFIG_W is not set
 # CONFIG_USERS is not set
+CONFIG_WHOAMI=y
 CONFIG_YES=y
 
 #
@@ -446,6 +448,7 @@ CONFIG_FEATURE_VI_REGEX_SEARCH=y
 CONFIG_FEATURE_VI_DOT_CMD=y
 CONFIG_FEATURE_VI_READONLY=y
 CONFIG_FEATURE_VI_SETOPTS=y
+CONFIG_FEATURE_VI_FILE_FORMAT=y
 CONFIG_FEATURE_VI_SET=y
 CONFIG_FEATURE_VI_WIN_RESIZE=y
 # CONFIG_FEATURE_VI_ASK_TERMINAL is not set
@@ -530,10 +533,10 @@ CONFIG_INIT_TERMINAL_TYPE=""
 # CONFIG_USE_BB_SHADOW is not set
 # CONFIG_USE_BB_CRYPT is not set
 # CONFIG_USE_BB_CRYPT_SHA is not set
-# CONFIG_ADDGROUP is not set
-# CONFIG_FEATURE_ADDUSER_TO_GROUP is not set
 # CONFIG_ADD_SHELL is not set
 # CONFIG_REMOVE_SHELL is not set
+# CONFIG_ADDGROUP is not set
+# CONFIG_FEATURE_ADDUSER_TO_GROUP is not set
 # CONFIG_ADDUSER is not set
 # CONFIG_FEATURE_CHECK_NAMES is not set
 CONFIG_LAST_ID=0
@@ -752,6 +755,7 @@ CONFIG_REV=y
 # Miscellaneous Utilities
 #
 # CONFIG_ADJTIMEX is not set
+CONFIG_ASCII=y
 # CONFIG_BBCONFIG is not set
 # CONFIG_FEATURE_COMPRESS_BBCONFIG is not set
 CONFIG_BC=y
@@ -785,10 +789,10 @@ CONFIG_FEATURE_CROND_DIR=""
 # CONFIG_FEATURE_DEVFS is not set
 # CONFIG_DEVMEM is not set
 # CONFIG_FBSPLASH is not set
-# CONFIG_FLASHCP is not set
 # CONFIG_FLASH_ERASEALL is not set
 # CONFIG_FLASH_LOCK is not set
 # CONFIG_FLASH_UNLOCK is not set
+# CONFIG_FLASHCP is not set
 # CONFIG_HDPARM is not set
 # CONFIG_FEATURE_HDPARM_GET_IDENTITY is not set
 # CONFIG_FEATURE_HDPARM_HDIO_SCAN_HWIF is not set
@@ -839,13 +843,13 @@ CONFIG_STRINGS=y
 CONFIG_TIME=y
 CONFIG_TS=y
 CONFIG_TTYSIZE=y
-# CONFIG_UBIRENAME is not set
 # CONFIG_UBIATTACH is not set
 # CONFIG_UBIDETACH is not set
 # CONFIG_UBIMKVOL is not set
 # CONFIG_UBIRMVOL is not set
 # CONFIG_UBIRSVOL is not set
 # CONFIG_UBIUPDATEVOL is not set
+# CONFIG_UBIRENAME is not set
 # CONFIG_VOLNAME is not set
 # CONFIG_WATCHDOG is not set
 # CONFIG_FEATURE_WATCHDOG_OPEN_TWICE is not set