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(* 'top'-like tool for libvirt domains.
*)
let (//) = Filename.concat
(* Input a whole file as a list of lines. *)
let input_all_lines chan =
let lines = ref [] in
(try
while true; do
lines := input_line chan :: !lines
done
with
End_of_file -> ());
List.rev !lines
(* Trim whitespace from the beginning and end of strings. *)
let isspace c =
c = ' '
(* || c = '\f' *) || c = '\n' || c = '\r' || c = '\t' (* || c = '\v' *)
let triml ?(test = isspace) str =
let i = ref 0 in
let n = ref (String.length str) in
while !n > 0 && test str.[!i]; do
decr n;
incr i
done;
if !i = 0 then str
else String.sub str !i !n
let trimr ?(test = isspace) str =
let n = ref (String.length str) in
while !n > 0 && test str.[!n-1]; do
decr n
done;
if !n = String.length str then str
else String.sub str 0 !n
let trim ?(test = isspace) str =
trimr (triml str)
(* Read a configuration file as a list of (key, value) pairs.
* If the config file is missing this returns an empty list.
*)
let blanks_and_comments = Str.regexp "^[ \t]*\\(#.*\\)?$"
let read_config_file filename =
let lines =
try
let chan = open_in filename in
let lines = input_all_lines chan in
close_in chan;
lines
with
Sys_error _ -> [] in (* Ignore errors opening file. *)
(* Line numbers. *)
let lines =
let i = ref 0 in List.map (fun line -> (incr i; !i), line) lines in
(* Remove blank lines and comment lines. *)
let lines =
List.filter
(fun (lineno, line) ->
not (Str.string_match blanks_and_comments line 0)) lines in
(* Convert to key, value pairs. *)
List.map (
fun (lineno, line) ->
let key, value = ExtString.String.split line " " in
lineno, trim key, trim value
) lines
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