cabal help 显示thers不是"卸载"选项.
那么卸载cabal安装的软件包的最佳方法是什么？
% cabal update
% cabal install mighttpd2
mighttpd2已成功安装.但是ghc-pkg无法找到并取消注册:
% ghc-pkg list | grep -i might
% ghc-pkg unregister mighttpd2
ghc-pkg: cannot find package mighttpd2
祝商祺!
>find .cabal | grep -i mighttp
.cabal/share/doc/mighttpd2-2.3.3
.cabal/share/doc/mighttpd2-2.3.3/LICENSE
.cabal/share/mighttpd2-2.3.3
.cabal/share/mighttpd2-2.3.3/sample.conf
.cabal/share/mighttpd2-2.3.3/sample.route
.cabal/packages/hackage.haskell.org/mighttpd2
.cabal/packages/hackage.haskell.org/mighttpd2/2.3.3
.cabal/packages/hackage.haskell.org/mighttpd2/2.3.3/mighttpd2-2.3.3.tar.gz
>ghc-pkg list | grep -i package\.conf
/usr/local/lib/ghc-7.0.3/package.conf.d:
/home/sw2wolf/.ghc/i386-freebsd-7.0.3/package.conf.d:
所以ghc-pkg无法看到".cabal/packages/hackage.haskell.org".
在visual lisp中,您可以使用(atoi "123")转换"123"为123.在clisp中似乎没有"atoi"这样的功能？
任何建议表示赞赏!
现在我想转换'(1 2 3 20 30)成"1 2 3 20 30",那么最好的方法是什么？
parse-interger可以将字符串转换为整数,以及如何将整数转换为字符串？我需要使用format功能吗？
(map 'list #'(lambda (x) (format nil "~D" x)) '(1 2 3)) => ("1" "2" "3")
但是我不知道如何将它变为"1 2 3"像haskell那样:
concat $ intersperse " " ["1","2","3","4","5"] => "1 2 3 4 5"
祝商祺!
当我#use "topfind" ;;手动输入顶级时,它的工作原理如下:
#use "topfind" ;;
- : unit = ()
Findlib has been successfully loaded. Additional directives:
#require "package";; to load a package
#list;; to list the available packages
#camlp4o;; to load camlp4 (standard syntax)
#camlp4r;; to load camlp4 (revised syntax)
#predicates "p,q,...";; to set these predicates
Topfind.reset();; to force that packages will be reloaded
#thread;; to enable threads #use "topfind" ;;
- : unit = ()
然而,当我把#use "topfind";;在~/.ocamlinit文件中,这是行不通的:
>cat ~/.ocamlinit
#use "topfind";; …有些文本文件需要逐行操作.我写了一个withFile函数如下:
let withFile fn handle =
let rec iter_lines fh =
try
handle (input_line fh);
iter_lines fh
with _ -> close_in fh in
iter_lines (open_in fn);;
所以我可以将每个文件操作为:
withFile "file1.txt" (fun line -> (*...*))
withFile "file2.txt" (fun line -> (*...*))
...
但是当我不想处理所有线路时,我不确定如何优雅地退出.例如:
withFile "file3.txt" (fun line ->
(*when the line meets some condition, i will exit without handling other lines*)
);
任何建议表示赞赏!
配置文件test.conf如下:
<ocsigen>
<server>
<port>*:8000</port>
<logdir>/home/zaxis/tmp/log/</logdir>
<datadir>/home/zaxis/tmp/data</datadir>
<user>zaxis</user>
<group>wheel</group>
<charset>utf-8</charset>
......
<extension findlib-package="ocsigen_ext.cgimod">
<cgitimeout value="30"/>
</extension>
<extension findlib-package="ocsigen_ext.staticmod"/>
......
<site path="qachina" charset="utf-8">
<cgi root="cgi-bin" dir="/media/E/www/qachina/cgi-bin"/>
<static dir="/media/E/www/qachina" />
</site>
....
<commandpipe>/home/zaxis/tmp/ocsigen_command</commandpipe>
</server>
</ocsigen>
然后我运行Ocsigen:
ocsigeocsigen -c test.conf
我可以访问http://127.0.0.1:8000/qachina/index.htm.但是,Ocsigen不会在cgi-bin中执行我的python脚本,但希望浏览器下载它.
顺便说一句,所有python脚本文件都可以直接在shell中运行.
>head cgi-bin/nav.py
#!/usr/bin/env python
# -*- coding: utf-8 -*-enter code here
...
我无法访问Ocsigen的邮件列表,所以我在这里发帖寻求建议.
SBCL可以成功加载hunchentoot.然而,CCL报道:
? (ql:quickload :hunchentoot)
To load "hunchentoot":
Load 1 ASDF system:
hunchentoot
; Loading "hunchentoot"
> Error: Unable to load any of the alternatives:
> ("libssl.so.0.9.8" "libssl.so" "libssl.so.4")
> While executing: CFFI::FL-ERROR, in process listener(1).
> Type :POP to abort, :R for a list of available restarts.
> Type :? for other options.nter code here
任何建议表示赞赏!
我需要一个使用Haskell开发的Web服务器来运行旧的Python CGI应用程序.
任何建议表示赞赏!
我可以使用以下函数来覆盖文本文件:
let writeFile ~filename:fn s =
let oc = open_out fn in
output_string oc s;
close_out oc ;;
但是,我不知道如何在文本文件中附加一行？
(defun (setf xwin-border-width) (width win)
(setf (xlib:drawable-border-width win) width))
那么如何调用上面的函数呢？事实上,我真的不明白"(setf xwin-border-width)"代替功能时间是什么意思？
真诚的!
当我跑步时cabal install hoogle,我得到以下内容:
setup: The program happy version >=1.17 is required but it could not be found
cabal: Error: some packages failed to install
haskell-src-exts-1.13.3 failed during the configure step the exeption is ExitFailure 1
$ghc -V
The Glorious Glasgow Haskell Compilation System, version 7.4.1
如何解决这样的问题？