utils.ml

   1 exception Quit;;
   2
   3 module E = struct
   4   let s = "";;
   5   let b = Bytes.empty;;
   6   let a = [||];;
   7 end;;
   8
   9 type platform = | Punknown | Plinux | Pmacos | Pbsd;;
  10
  11 let asciilower = let auld = Char.code 'A' - Char.code 'a' in
  12                  function
  13                  | ('A'..'Z') as c -> Char.code c - auld |> Char.chr
  14                  | c -> c
  15 ;;
  16
  17 let tempfailureretry f a =
  18   let rec g () =
  19     try f a with Unix.Unix_error (Unix.EINTR, _, _) -> g ()
  20   in g ()
  21 ;;
  22
  23 external measurestr : int -> string -> float = "ml_measure_string";;
  24 external cloexec : Unix.file_descr -> unit = "ml_cloexec";;
  25 external hasdata : Unix.file_descr -> bool = "ml_hasdata";;
  26 external toutf8 : int -> string = "ml_keysymtoutf8";;
  27 external mbtoutf8 : string -> string = "ml_mbtoutf8";;
  28 external spawn : string -> (Unix.file_descr * int) list -> int = "ml_spawn";;
  29 external platform : unit -> (platform * string array) = "ml_platform";;
  30
  31 let now = Unix.gettimeofday;;
  32 let platform, uname = platform ();;
  33 let dolog fmt = Format.ksprintf prerr_endline fmt;;
  34
  35 let exntos = function
  36   | Unix.Unix_error (e, s, a) ->
  37      Printf.sprintf "%s(%s) : %s (%d)" s a (Unix.error_message e) (Obj.magic e)
  38   | exn -> Printexc.to_string exn
  39 ;;
  40
  41 let error fmt = Printf.kprintf (fun s -> failwith s) fmt;;
  42
  43 module IntSet = Set.Make (struct type t = int let compare = (-) end);;
  44
  45 let emptystr s = String.length s = 0;;
  46 let nonemptystr s = String.length s > 0;;
  47 let bound v minv maxv = max minv (min maxv v);;
  48
  49 module Opaque : sig
  50   type t = private string
  51   val of_string : string -> t
  52   val to_string : t -> string
  53 end = struct
  54   type t = string
  55   let of_string s = s
  56   let to_string t = t
  57 end
  58 ;;
  59
  60 let (~<) = Opaque.of_string;;
  61 let (~>) = Opaque.to_string;;
  62
  63 let int_of_string_with_suffix s =
  64   let l = String.length s in
  65   let s1, shift =
  66     if l > 1
  67     then
  68       let p = l-1 in
  69       match s.[p] with
  70       | 'k' | 'K' -> String.sub s 0 p, 10
  71       | 'm' | 'M' -> String.sub s 0 p, 20
  72       | 'g' | 'G' -> String.sub s 0 p, 30
  73       | _ -> s, 0
  74     else s, 0
  75   in
  76   let n = int_of_string s1 in
  77   let m = n lsl shift in
  78   if m < 0 || m < n
  79   then error "value too large"
  80   else m
  81 ;;
  82
  83 let string_with_suffix_of_int n =
  84   if n = 0
  85   then "0"
  86   else
  87     let units = [(30, "G"); (20, "M"); (10, "K")] in
  88     let prettyint n =
  89       let rec loop s n =
  90         let h = n mod 1000 in
  91         let n = n / 1000 in
  92         if n = 0
  93         then string_of_int h ^ s
  94         else loop (Printf.sprintf "_%03d%s" h s) n
  95       in
  96       loop E.s n
  97     in
  98     let rec find = function
  99       | [] -> prettyint n
 100       | (shift, suffix) :: rest ->
 101          if (n land ((1 lsl shift) - 1)) = 0
 102          then prettyint (n lsr shift) ^ suffix
 103          else find rest
 104     in
 105     find units
 106 ;;
 107
 108 let color_of_string s =
 109   Scanf.sscanf s "%d/%d/%d" (fun r g b ->
 110       (float r /. 255.0, float g /. 255.0, float b /. 255.0)
 111     )
 112 ;;
 113
 114 let rgba_of_string s =
 115   Scanf.sscanf
 116     s "%d/%d/%d/%d" (fun r g b a ->
 117       (float r /. 255.0, float g /. 255.0, float b /. 255.0, float a /. 255.0)
 118     )
 119 ;;
 120
 121 let color_to_string (r, g, b) =
 122   let r = truncate (r *. 255.0)
 123   and g = truncate (g *. 255.0)
 124   and b = truncate (b *. 255.0) in
 125   Printf.sprintf "%d/%d/%d" r g b
 126 ;;
 127
 128 let rgba_to_string (r, g, b, a) =
 129   let r = truncate (r *. 255.0)
 130   and g = truncate (g *. 255.0)
 131   and b = truncate (b *. 255.0)
 132   and a = truncate (a *. 255.0) in
 133   Printf.sprintf "%d/%d/%d/%d" r g b a
 134 ;;
 135
 136 let abspath path =
 137   if Filename.is_relative path
 138   then
 139     let cwd = Sys.getcwd () in
 140     if Filename.is_implicit path
 141     then Filename.concat cwd path
 142     else Filename.concat cwd (Filename.basename path)
 143   else path
 144 ;;
 145
 146 module Ne = struct
 147   let index s c = try String.index s c with Not_found -> -1;;
 148   let clo fd f =
 149     try tempfailureretry Unix.close fd
 150     with exn -> f @@ exntos exn
 151   ;;
 152 end;;
 153
 154 let getenvwithdef name def =
 155   match Sys.getenv name with
 156   | env -> env
 157   | exception Not_found -> def
 158 ;;
 159
 160 module Re = struct
 161   let crlf = Str.regexp "[\r\n]";;
 162   let percent = Str.regexp "%s";;
 163   let whitespace = Str.regexp "[ \t]";;
 164 end;;
 165
 166 let unit () = ();;
 167
 168 let addchar s c =
 169   let b = Buffer.create (String.length s + 1) in
 170   Buffer.add_string b s;
 171   Buffer.add_char b c;
 172   Buffer.contents b;
 173 ;;
 174
 175 let btod b = if b then 1 else 0;;
 176
 177 let splitatchar s c = let open String in
 178                       match index s c with
 179                       | pos -> sub s 0 pos, sub s (pos+1) (length s - pos - 1)
 180                       | exception Not_found -> s, E.s
 181 ;;
 182
 183 let boundastep h step =
 184   if step < 0
 185   then bound step ~-h 0
 186   else bound step 0 h
 187 ;;
 188
 189 let withoutlastutf8 s =
 190   let len = String.length s in
 191   if len = 0
 192   then s
 193   else
 194     let rec find pos =
 195       if pos = 0
 196       then pos
 197       else
 198         let b = Char.code s.[pos] in
 199         if b land 0b11000000 = 0b11000000
 200         then pos
 201         else find (pos-1)
 202     in
 203     let first =
 204       if Char.code s.[len-1] land 0x80 = 0
 205       then len-1
 206       else find (len-1)
 207     in
 208     String.sub s 0 first;
 209 ;;
 210
 211 let fdcontents fd =
 212   let l = 4096 in
 213   let b = Buffer.create l in
 214   let s = Bytes.create l in
 215   let rec loop () =
 216     let n = tempfailureretry (Unix.read fd s 0) l in
 217     if n = 0
 218     then Buffer.contents b
 219     else (
 220       Buffer.add_subbytes b s 0 n;
 221       loop ()
 222     )
 223   in
 224   loop ()
 225 ;;
 226
 227 let filecontents path =
 228   let fd = Unix.openfile path [Unix.O_RDONLY] 0o0 in
 229   match fdcontents fd with
 230   | exception exn ->
 231      error "failed to read contents of %s: %s" path @@ exntos exn
 232   | s ->
 233      Ne.clo fd @@ error "failed to close descriptor for %s: %s" path;
 234      s
 235 ;;
 236
 237 let getcmdoutput errfun cmd =
 238   let reperror fmt = Printf.kprintf errfun fmt in
 239   let clofail s e = error "failed to close %s: %s" s e in
 240   match Unix.pipe () with
 241   | exception exn ->
 242      reperror "pipe failed: %s" @@ exntos exn;
 243      E.s
 244   | (r, w) ->
 245      match spawn cmd [r, -1; w, 1] with
 246      | exception exn ->
 247         reperror "failed to execute %S: %s" cmd @@ exntos exn;
 248         E.s
 249      | pid ->
 250         Ne.clo w @@ clofail "write end of the pipe";
 251         let s =
 252           match Unix.waitpid [] pid with
 253           | exception exn ->
 254              reperror "waitpid on %S %d failed: %s" cmd pid @@ exntos exn;
 255              E.s
 256           | _pid, Unix.WEXITED 0 ->
 257              begin
 258                match fdcontents r with
 259                | exception exn ->
 260                   reperror "failed to read output of %S: %s" cmd @@ exntos exn;
 261                   E.s
 262                | s ->
 263                   let l = String.length s in
 264                   if l > 0 && s.[l-1] = '\n'
 265                   then String.sub s 0 (l-1)
 266                   else s
 267              end;
 268           | _pid, Unix.WEXITED n ->
 269              reperror "%S exited with error code %d" cmd n;
 270              E.s
 271           | _pid, Unix.WSIGNALED n ->
 272              reperror "%S was killed with signal %d" cmd n;
 273              E.s
 274           | _pid, Unix.WSTOPPED n ->
 275              reperror "%S was stopped by signal %d" cmd n;
 276              E.s
 277         in
 278         Ne.clo r @@ clofail "read end of the pipe";
 279         s
 280 ;;
 281
 282 let geturl =
 283   let re = Str.regexp {|.*\(\(https?\|ftp\|mailto\|file\)://[^ ]+\).*|} in
 284   fun s -> if Str.string_match re s 0
 285            then Str.matched_group 1 s
 286            else E.s
 287 ;;
 288
 289 let substratis s pos subs =
 290   let subslen = String.length subs in
 291   if String.length s - pos >= subslen
 292   then
 293     let rec cmp i = i = subslen || (s.[pos+i] = subs.[i]) && cmp (i+1)
 294     in cmp 0
 295   else false
 296 ;;
 297
 298 let w8 s pos i = Bytes.set s pos (Char.chr (i land 0xff));;
 299 let r8 s pos = Char.code (Bytes.get s pos);;
 300
 301 let w16 s pos i =
 302   w8 s pos i;
 303   w8 s (pos+1) (i lsr 8)
 304 ;;
 305
 306 let w32 s pos i =
 307   w16 s pos i;
 308   w16 s (pos+2) (i lsr 16)
 309 ;;
 310
 311 let r16 s pos =
 312   let rb pos1 = Char.code (Bytes.get s (pos + pos1)) in
 313   (rb 0) lor ((rb 1) lsl 8)
 314 ;;
 315
 316 let r16s s pos =
 317   let i = r16 s pos in
 318   i - ((i land 0x8000) lsl 1)
 319 ;;
 320
 321 let r32 s pos =
 322   let rb pos1 = Char.code (Bytes.get s (pos + pos1)) in
 323   let l = (rb 0) lor ((rb 1) lsl 8)
 324   and u = (rb 2) lor ((rb 3) lsl 8) in
 325   (u lsl 16) lor l
 326 ;;
 327
 328 let r32s =
 329   if Sys.word_size > 32
 330   then fun s pos ->
 331        let rb pos1 = Char.code (Bytes.get s (pos + pos1)) in
 332        let v0 = rb 0 and v1 = rb 1 and v2 = rb 2 and v3 = rb 3 in
 333        let v = v0 lor (v1 lsl 8) lor (v2 lsl 16) lor (v3 lsl 24) in
 334        if v3 land 0x80 = 0
 335        then v
 336        else (v - (1 lsl 32))
 337   else fun _ _ -> error "r32s: not implemented for word_size <= 32"
 338 ;;
 339
 340 let vlog fmt = Format.ksprintf ignore fmt;;
 341
 342 let pipef ?(closew=true) cap f cmd =
 343   match Unix.pipe () with
 344   | exception exn -> dolog "%s cannot create pipe: %S" cap @@ exntos exn
 345   | (r, w) ->
 346      begin match spawn cmd [r, 0; w, -1] with
 347      | exception exn -> dolog "%s: cannot execute %S: %s" cap cmd @@ exntos exn
 348      | _pid -> f w
 349      end;
 350      Ne.clo r (dolog "%s failed to close r: %s" cap);
 351      if closew then Ne.clo w (dolog "%s failed to close w: %s" cap);
 352 ;;
 353
 354 let selstring selcmd s =
 355   pipef "selstring" (fun w ->
 356       try
 357         let l = String.length s in
 358         let bytes = Bytes.unsafe_of_string s in
 359         let n = tempfailureretry (Unix.write w bytes 0) l in
 360         if n != l
 361         then dolog "failed to write %d characters to sel pipe, wrote %d" l n;
 362       with exn -> dolog "failed to write to sel pipe: %s" @@ exntos exn
 363     ) selcmd
 364 ;;