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#
#
#            Nimrod's Runtime Library
#        (c) Copyright 2012 Andreas Rumpf
#
#    See the file "copying.txt", included in this
#    distribution, for details about the copyright.
#

## This module implements a simple proc for opening URLs with the user's
## default browser.

import strutils

when defined(windows):
  import winlean
else:
  import os, osproc

proc openDefaultBrowser*(url: string) =
  ## opens `url` with the user's default browser. This does not block.
  ##
  ## Under Windows, ``ShellExecute`` is used. Under Mac OS X the ``open``
  ## command is used. Under Unix, it is checked if ``gnome-open`` exists and
  ## used if it does. Next attempt is ``kde-open``, then ``xdg-open``.
  ## Otherwise the environment variable ``BROWSER`` is used to determine the
  ## default browser to use.
  when defined(windows):
    when useWinUnicode:
      var o = newWideCString("open")
      var u = newWideCString(url)
      discard ShellExecuteW(0'i32, o, u, nil, nil, SW_SHOWNORMAL)
    else:
      discard ShellExecuteA(0'i32, "open", url, nil, nil, SW_SHOWNORMAL)
  elif defined(macosx):
    discard execShellCmd("open " & quoteIfContainsWhite(url))
  else:
    const attempts = ["gnome-open ", "kde-open ", "xdg-open "]
    var u = quoteIfContainsWhite(url)
    for a in items(attempts):
      if execShellCmd(a & u) == 0: return
    for b in getEnv("BROWSER").string.split(PathSep):
      try:
        # we use ``startProcess`` here because we don't want to block!
        discard startProcess(command=b, args=[url], options={poUseShell})
        return
      except EOS:
        nil
span class="p">} .SpecialChar { color: #d70000; } .Normal { color: #000000; background-color: #ffffd7; padding-bottom: 1px; } .Constant { color: #008787; } --> </style> <script type='text/javascript'> <!-- /* function to open any folds containing a jumped-to line before jumping to it */ function JumpToLine() { var lineNum; lineNum = window.location.hash; lineNum = lineNum.substr(1); /* strip off '#' */ if (lineNum.indexOf('L') == -1) { lineNum = 'L'+lineNum; } var lineElem = document.getElementById(lineNum); /* Always jump to new location even if the line was hidden inside a fold, or * we corrected the raw number to a line ID. */ if (lineElem) { lineElem.scrollIntoView(true); } return true; } if ('onhashchange' in window) { window.onhashchange = JumpToLine; } --> </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/linux/ex10.subx'>https://github.com/akkartik/mu/blob/main/linux/ex10.subx</a> <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="subxComment"># String comparison: return 1 iff the two args passed in at the commandline are equal.</span> <span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span> <span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span> <span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ bootstrap/bootstrap translate ex10.subx -o ex10</span> <span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ bootstrap/bootstrap run ex10 abc abd</span> <span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span> <span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo $?</span> <span id="L8" class="LineNr"> 8 </span><span class="subxComment"># 0 # false</span> <span id="L9" class="LineNr"> 9 </span> <span id="L10" class="LineNr">10 </span>== code <span id="L11" class="LineNr">11 </span><span class="subxComment"># instruction effective address register displacement immediate</span> <span id="L12" class="LineNr">12 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span> <span id="L13" class="LineNr">13 </span><span class="subxS1Comment"># . 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span> <span id="L14" class="LineNr">14 </span> <span id="L15" class="LineNr">15 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># return argv-equal(argv[1], argv[2])</span> <span id="L16" class="LineNr">16 </span><span class="subxComment"># At the start of a SubX program:</span> <span id="L17" class="LineNr">17 </span><span class="subxComment"># argc: *esp</span> <span id="L18" class="LineNr">18 </span><span class="subxComment"># argv[0]: *(esp+4)</span> <span id="L19" class="LineNr">19 </span><span class="subxComment"># argv[1]: *(esp+8)</span> <span id="L20" class="LineNr">20 </span><span class="subxComment"># ...</span> <span id="L21" class="LineNr">21 </span> <span class="subxS1Comment"># . prologue</span> <span id="L22" class="LineNr">22 </span> 89/copy 3/mod/direct 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/r32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy esp to ebp</span> <span id="L23" class="LineNr">23 </span> <span class="subxComment"># argv-equal(argv[1], argv[2])</span> <span id="L24" class="LineNr">24 </span> <span class="subxS2Comment"># . . push argv[2]</span> <span id="L25" class="LineNr">25 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span> <span id="L26" class="LineNr">26 </span> <span class="subxS2Comment"># . . push argv[1]</span> <span id="L27" class="LineNr">27 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span> <span id="L28" class="LineNr">28 </span> <span class="subxS2Comment"># . . call</span> <span id="L29" class="LineNr">29 </span> e8/call <a href='ex10.subx.html#L36'>argv-equal</a>/disp32 <span id="L30" class="LineNr">30 </span> <span class="subxComment"># exit(eax)</span> <span id="L31" class="LineNr">31 </span> 89/copy 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy eax to ebx</span> <span id="L32" class="LineNr">32 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32 <span id="L33" class="LineNr">33 </span> <span id="L34" class="LineNr">34 </span><span class="subxComment"># compare two null-terminated ascii strings</span> <span id="L35" class="LineNr">35 </span><span class="subxComment"># reason for the name: the only place we should have null-terminated ascii strings is from commandline args</span> <span id="L36" class="LineNr">36 </span><span class="subxFunction">argv-equal</span>: <span class="subxComment"># (s1, s2): null-terminated ascii strings -&gt; eax: boolean</span> <span id="L37" class="LineNr">37 </span> <span class="subxComment"># initialize s1 (ecx) and s2 (edx)</span> <span id="L38" class="LineNr">38 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none <span class="Normal"> . </span> 1/r32/ecx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(esp+4) to ecx</span> <span id="L39" class="LineNr">39 </span> 8b/copy 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none <span class="Normal"> . </span> 2/r32/edx 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(esp+8) to edx</span> <span id="L40" class="LineNr">40 </span><span class="Constant">$argv-equal:loop</span>: <span id="L41" class="LineNr">41 </span> <span class="subxComment"># c1/eax, c2/ebx = *s1, *s2</span> <span id="L42" class="LineNr">42 </span> b8/copy-to-eax 0/imm32 <span id="L43" class="LineNr">43 </span> 8a/copy-byte 0/mod/indirect 1/rm32/ecx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/AL <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy byte at *ecx to AL</span> <span id="L44" class="LineNr">44 </span> bb/copy-to-ebx 0/imm32 <span id="L45" class="LineNr">45 </span> 8a/copy-byte 0/mod/indirect 2/rm32/edx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/BL <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy byte at *edx to BL</span> <span id="L46" class="LineNr">46 </span> <span class="subxComment"># if (c1 == 0) break</span> <span id="L47" class="LineNr">47 </span> 3d/compare-eax-and 0/imm32/null <span id="L48" class="LineNr">48 </span> 74/jump-if-= $argv-equal:<span class="Constant">break</span>/disp8 <span id="L49" class="LineNr">49 </span> <span class="subxComment"># if (c1 != c2) return false</span> <span id="L50" class="LineNr">50 </span> 39/compare 3/mod/direct 0/rm32/eax <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># compare eax and ebx</span> <span id="L51" class="LineNr">51 </span> 75/jump-if-!= $argv-equal:false/disp8 <span id="L52" class="LineNr">52 </span> <span class="subxComment"># ++s1, ++s2</span> <span id="L53" class="LineNr">53 </span> 41/increment-ecx <span id="L54" class="LineNr">54 </span> 42/increment-edx <span id="L55" class="LineNr">55 </span> <span class="subxComment"># end while</span> <span id="L56" class="LineNr">56 </span> eb/jump $argv-equal:<span class="Constant">loop</span>/disp8 <span id="L57" class="LineNr">57 </span><span class="Constant">$argv-equal:break</span>: <span id="L58" class="LineNr">58 </span> <span class="subxComment"># if (c2 == 0) return true</span> <span id="L59" class="LineNr">59 </span> 81 7/subop/compare 3/mod/direct 3/rm32/ebx <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/imm32/null <span class="subxComment"># compare ebx</span> <span id="L60" class="LineNr">60 </span> 75/jump-if-!= $argv-equal:false/disp8 <span id="L61" class="LineNr">61 </span><span class="Constant">$argv-equal:success</span>: <span id="L62" class="LineNr">62 </span> b8/copy-to-eax 1/imm32 <span id="L63" class="LineNr">63 </span> c3/return <span id="L64" class="LineNr">64 </span> <span class="subxComment"># return false</span> <span id="L65" class="LineNr">65 </span><span class="Constant">$argv-equal:false</span>: <span id="L66" class="LineNr">66 </span> b8/copy-to-eax 0/imm32 <span id="L67" class="LineNr">67 </span> c3/return <span id="L68" class="LineNr">68 </span> <span id="L69" class="LineNr">69 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span> </pre> </body> </html> <!-- vim: set foldmethod=manual : -->