The OpenD Programming Language

timeLastModified

std file

Returns the time that the given file was last modified. If the file does not exist, returns returnIfMissing.

A frequent usage pattern occurs in build automation tools such as make or ant. To check whether file target must be rebuilt from file source (i.e., target is older than source or does not exist), use the comparison below. The code throws a FileException if source does not exist (as it should). On the other hand, the SysTime.min default makes a non-existing target seem infinitely old so the test correctly prompts building it.

  1. SysTime timeLastModified(R name)
  2. SysTime timeLastModified(R name)
  3. SysTime timeLastModified(R name, SysTime returnIfMissing)
    SysTime
    timeLastModified
    (
    R
    )
    (
    R name
    ,
    SysTime returnIfMissing
    )
    if (
    isSomeFiniteCharInputRange!R
    )
  4. SysTime timeLastModified(stat_t statbuf)

Parameters

name R

The name of the file to get the modification time for.

returnIfMissing SysTime

The time to return if the given file does not exist.

Return Value

Type: SysTime

Examples

if (source.timeLastModified >= target.timeLastModified(SysTime.min))
{
    // must (re)build
}
else
{
    // target is up-to-date
}
import std.datetime : SysTime;

assert("file.does.not.exist".timeLastModified(SysTime.min) == SysTime.min);

auto source = deleteme ~ "source";
auto target = deleteme ~ "target";
scope(exit) source.remove, target.remove;

source.write(".");
assert(target.timeLastModified(SysTime.min) < source.timeLastModified);
target.write(".");
assert(target.timeLastModified(SysTime.min) >= source.timeLastModified);

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