diff options
Diffstat (limited to 'runtime')
| -rw-r--r-- | runtime/doc/builtin.txt | 40 |
1 files changed, 26 insertions, 14 deletions
diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt index cb05718ab9..adb3164429 100644 --- a/runtime/doc/builtin.txt +++ b/runtime/doc/builtin.txt @@ -9507,31 +9507,43 @@ writefile({object}, {fname} [, {flags}]) When {object} is a |List| write it to file {fname}. Each list item is separated with a NL. Each list item must be a String or Number. - When {flags} contains "b" then binary mode is used: There will - not be a NL after the last list item. An empty item at the - end does cause the last line in the file to end in a NL. + All NL characters are replaced with a NUL character. + Inserting CR characters needs to be done before passing {list} + to writefile(). When {object} is a |Blob| write the bytes to file {fname} - unmodified. + unmodified, also when binary mode is not specified. - When {flags} contains "a" then append mode is used, lines are - appended to the file: > + {flags} must be a String. These characters are recognized: + + 'b' Binary mode is used: There will not be a NL after the + last list item. An empty item at the end does cause the + last line in the file to end in a NL. + + 'a' Append mode is used, lines are appended to the file: > :call writefile(["foo"], "event.log", "a") :call writefile(["bar"], "event.log", "a") < - When {flags} contains "S" fsync() call is not used, with "s" - it is used, 'fsync' option applies by default. No fsync() - means that writefile() will finish faster, but writes may be - left in OS buffers and not yet written to disk. Such changes - will disappear if system crashes before OS does writing. + 'D' Delete the file when the current function ends. This + works like: > + :defer delete({fname}) +< Fails when not in a function. Also see |:defer|. + + 's' fsync() is called after writing the file. This flushes + the file to disk, if possible. This takes more time but + avoids losing the file if the system crashes. + + 'S' fsync() is not called, even when 'fsync' is set. + + When {flags} does not contain "S" or "s" then fsync() is + called if the 'fsync' option is set. - All NL characters are replaced with a NUL character. - Inserting CR characters needs to be done before passing {list} - to writefile(). An existing file is overwritten, if possible. + When the write fails -1 is returned, otherwise 0. There is an error message if the file can't be created or when writing fails. + Also see |readfile()|. To copy a file byte for byte: > :let fl = readfile("foo", "b") |