Hello,
Here's the main utility word:
monitor-file ( file quot -- )
'quot' is called when 'file' is changed.
'quot' is passed a "file system change descriptor".
The monitoring happens in a separate thread.
If 'quot' throws an error, monitoring continues because 'quot' is run
via 'try'.
The 'quot' is run for any kind of change. Here's a word which only runs the
quot when the file is modified:
on-modify ( file quot -- )
Now I can make this word:
file-variable ( file var -- )
Whenever the 'file' is modified, the file contents are evaluated and the
resulting value is stored in the variable 'var'.
If there are multiple expressions in the file, the result of evaluating the
last one is used as the value.
Parsing errors are handled; the old variable value is preserved.
Here's an example:
"/tmp/tbl" tbl file-variable
Set the contents to: 20
tbl get .
20
Set the contents to: {
An error appears in the listener. The old value is retained:
tbl get .
20
Set the contents to: { 10 20 30 }
tbl get .
{ 10 20 30 }
Implementation is at:
http://paste.factorcode.org/responder/pastebin/show-paste?n=36
Ed
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