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(load "doc-syms")
(defvar usr:*doc-url* "https://www.nongnu.org/txr/txr-manpage.html")
(defvarl os-symbol
(if (ignerr (dlsym (dlopen "libandroid.so") "AAsset_close"))
:android
(let ((u (uname)))
[(orf (iff (f^ #/Linux/) (ret :linux))
(iff (f^ #/SunOS/)
(ret (if (<= 5 (int-str u.release))
:solaris10
:solaris)))
(iff (f^ #/CYGWIN/) (ret :cygwin))
(iff (f^ #/CYGNAL/) (ret :cygnal))
(iff (f^ #/Darwin/) (ret :macos))
(iff (f^ #/OpenBSD/) (ret :openbsd))
(ret :unknown))
u.sysname])))
(defun detached-run (program args)
(match-case (fork)
(@(= 0) (if (zerop (fork))
(exit* (let ((*stdout* *stdnull*))
(run program args)))
(exit* 0)))
(@(< @res 0) (error "fork failed"))))
(caseql os-symbol
((:linux :macos :openbsd :solaris :solaris10 :android)
(defun open-url (url)
(let ((opener (caseql os-symbol
((:linux :openbsd :solaris :android) "xdg-open")
(:solaris10 "/usr/dt/bin/sdtwebclient")
(:macos "open")))
(fallback '#"firefox iceweasel seamonkey mozilla \
epiphany konqueror chromium chromium-browser \
google-chrome"))
(iflet ((prog (getenv "BROWSER"))
(prog (or (and (plusp (len prog)) prog)
(if (abs-path-p opener)
opener
(path-search opener))
[find-true path-search fallback])))
(detached-run prog (list url))
(error "~s: no URL-opening method available" 'open-url)))))
((:cygwin :cygnal)
(with-dyn-lib "shell32.dll"
(deffi shell-execute "ShellExecuteW"
cptr (cptr wstr wstr wstr wstr int))
(defun open-url (url)
(let ((hinst (shell-execute cptr-null "open" url nil nil 0)))
(if (> (int-cptr hinst) 32)
t
(error `~s: failed to open ~s` 'open-url url))))))
(t (defun open-url (url) (error "~s: not implemented" 'open-url))))
(defun usr:doc (: sym)
(iflet ((str (typecase sym
(null sym)
(sym (let ((*package* (find-package "pub")))
(tostring sym)))
(t (tostringp sym))))
(tag (if str [doc-syms str] "")))
(open-url `@{*doc-url*}#@tag`)
(error "~s: ~s not found in symbol index" 'doc sym)))
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