推荐好书Enterprise Rails
Dan Chak写的Enterprise Rails很不错.作者在Amazon工作过.
他的观点独特,但是论据充分推理严密.
简介可参考亚马逊的这篇书评. 简略地翻译成中文的意思就是Dan Chak推荐的方法是Anti-Rails的.
例如他对MySQL不感冒,"如果要用数据库,就用PostgreSQL,用PostgreSQL的DDL,不用Ruby写的Migration Script,结束"
我对于他的某些观点还没有完全接受,但是相当值得重视.
例如,他强烈建议将decoractor code转移到plugin module中,充分利用ruby的管理机制.他完全反对使用git的submodule机制来代替.
这点我现在身有体会,git-submodule 给我带来的麻烦参考这里(git submodule告诉我子模块版本A可用,但是该版本不是正式的发布版本,因为没有这样的强制机制,事实是A不存在或者被某人误删了,于是我惨了) 解决办法可以类比于ruby(现在语言是elisp),使用emacs自带的包管理机制elpa而不是git-submodule.
My herbstluftwm configuration
CREATED:
UPDATED:
It's the best manual tile window manager I've used.
The default configuration is fine in most cases.
I added rules to make some firefox addons usable at my tiny netbook.
Here is my modified $HOME/.config/herbstluftwm/autostart:
#!/bin/bash
# this is a simple config for herbstluftwm
function hc() {
herbstclient "$@"
}
hc emit_hook reload
xsetroot -solid '#000000'
#feh --bg-scale /home/cb/.config/herbstluftwm/wallpaper.jpg
# keybindings
Mod=Mod4
hc keybind $Mod-Shift-q quit
hc keybind $Mod-Shift-r reload
hc keybind $Mod-Shift-c close
hc keybind $Mod-Return spawn terminator
hc keybind $Mod-x spawn dmenu_run
hc keybind $Mod-q spawn scrot -e 'mkdir -p ~/screenshot;mv $f ~/screenshot/'
# tags
TAG_NAMES=( {1..4} )
TAG_KEYS=( {1..4} 0 )
hc rename default "${TAG_NAMES[0]}" || true
for i in ${!TAG_NAMES[@]} ; do
hc add "${TAG_NAMES[$i]}"
key="${TAG_KEYS[$i]}"
if ! [ -z "$key" ] ; then
hc keybind "$Mod-$key" use "${TAG_NAMES[$i]}"
hc keybind "$Mod-Shift-$key" move "${TAG_NAMES[$i]}"
fi
done
# layouting
hc keybind $Mod-r remove
hc keybind $Mod-space cycle_layout 1
hc keybind $Mod-Shift-s split vertical 0.5
hc keybind $Mod-s split horizontal 0.5
hc keybind $Mod-o floating toggle
hc keybind $Mod-f fullscreen toggle
hc keybind $Mod-p pseudotile toggle
# resizing
RESIZESTEP=0.05
hc keybind $Mod-Control-h resize left +$RESIZESTEP
hc keybind $Mod-Control-j resize down +$RESIZESTEP
hc keybind $Mod-Control-k resize up +$RESIZESTEP
hc keybind $Mod-Control-l resize right +$RESIZESTEP
# mouse
hc mousebind $Mod-Button1 move
hc mousebind $Mod-Button2 resize
hc mousebind $Mod-Button3 zoom
# focus
hc keybind $Mod-BackSpace cycle_monitor
hc keybind $Mod-Tab cycle_all +1
hc keybind $Mod-Shift-Tab cycle_all -1
hc keybind $Mod-c cycle
hc keybind $Mod-h focus left
hc keybind $Mod-j focus down
hc keybind $Mod-k focus up
hc keybind $Mod-l focus right
hc keybind $Mod-Shift-h shift left
hc keybind $Mod-Shift-j shift down
hc keybind $Mod-Shift-k shift up
hc keybind $Mod-Shift-l shift right
# colors
hc set frame_border_active_color '#49351D'
hc set frame_border_normal_color '#73532D'
hc set frame_bg_normal_color '#BD9768'
hc set frame_bg_active_color '#BD8541'
hc set frame_border_width 0
hc set window_border_width 0
hc set window_border_normal_color '#AE8451'
hc set window_border_active_color '#F6FF00'
# rules
hc unrule -F
#hc rule class=XTerm tag=3 # move all xterms to tag 3
hc rule focus=on # normally do not focus new clients
# give focus to most common terminals
hc rule class~'(.*[Rr]xvt.*|.*[Tt]erm|Konsole)' focus=on
hc rule windowtype~'_NET_WM_WINDOW_TYPE_(DIALOG|UTILITY|SPLASH)' pseudotile=on
hc rule windowtype='_NET_WM_WINDOW_TYPE_DIALOG' focus=on
hc rule windowtype~'_NET_WM_WINDOW_TYPE_(NOTIFICATION|DOCK)' manage=off
hc rule instance=xv class=MPlayer fullscreen=on
#firefox dialog should be fullscreen, useful for my tiny eeepc
hc rule instance="Dialog" class="Firefox" fullscreen=on #delicious bookmark
hc rule instance="Aup" class="Firefox" fullscreen=on #autoproxy
hc rule instance="Abp" class="Firefox" fullscreen=on #adblock plus
#view the image in fullscreen
#hc rule instance=feh class=feh fullscreen=on #feh has some bug
#autorun
hc spawn ~/.config/herbstluftwm/panel.sh
hc spawn parcellite -nd #use parcellite -p/-c to see the content
xprop is useful for writing "hc rule". Please man herbstclient
.
panel.sh is from the official package. It will display a panel at the top of the screen.
Here is my $HOME/.config/herbstluftwm/panel.sh (modified for display batttery rate):
#!/bin/bash
monitor=${1:-0}
geometry=( $(herbstclient monitor_rect "$monitor") )
if [ -z "$geometry" ] ;then
echo "Invalid monitor $monitor"
exit 1
fi
# geometry has the format: WxH+X+Y
x=${geometry[0]}
y=${geometry[1]}
width=${geometry[2]}
height=16
font="-*-fixed-medium-*-*-*-12-*-*-*-*-*-*-*"
bgcolor='#3E2600'
function uniq_linebuffered() {
awk '$0 != l { print ; l=$0 ; fflush(); }' "$@"
}
herbstclient pad $monitor $height
{
# events:
#mpc idleloop player &
while true ; do
date +'date ^fg(#efefef)%H:%M^fg(#909090), %Y-%m-^fg(#efefef)%d'
sleep 1 || break
done > >(uniq_linebuffered) &
childpid=$!
herbstclient --idle
kill $childpid
} 2> /dev/null | {
TAGS=( $(herbstclient tag_status $monitor) )
date=""
while true ; do
bordercolor="#26221C"
hintcolor="#573500"
separator="^fg(#141414)^ro(1x$height)^fg()"
# draw tags
for i in "${TAGS[@]}" ; do
case ${i:0:1} in
'#')
echo -n "^bg(#9fbc00)^fg(#141414)"
;;
'+')
echo -n "^bg(#9CA668)^fg(#141414)"
;;
':')
echo -n "^bg(#6A4100)^fg(#141414)"
;;
'!')
echo -n "^bg(#FF0675)^fg(#141414)"
;;
*)
echo -n "^bg()^fg()"
;;
esac
echo -n "^ca(1,herbstclient focus_monitor $monitor && "'herbstclient use "'${i:1}'") '"${i:1} ^ca()"
echo -n "$separator"
done
echo -n "^bg()^p(_CENTER)"
# small adjustments
battery=$(expr $(expr $(cat /sys/class/power_supply/BAT*/charge_now) \* 100) / $(cat /sys/class/power_supply/BAT*/charge_full))
if [ "$battery" = "/" ] ;then
right="$separator^bg($hintcolor) $date $separator"
else
right="$separator^bg($hintcolor) $battery% $date $separator"
fi
right_text_only=$(echo -n "$right"|sed 's.\^[^(]*([^)]*)..g')
# get width of right aligned text.. and add some space..
width=$(textwidth "$font" "$right_text_only ")
echo -n "^p(_RIGHT)^p(-$width)$right"
echo
# wait for next event
read line || break
cmd=( $line )
# find out event origin
case "${cmd[0]}" in
tag*)
#echo "reseting tags" >&2
TAGS=( $(herbstclient tag_status $monitor) )
;;
date)
#echo "reseting date" >&2
date="${cmd[@]:1}"
;;
quit_panel)
exit
;;
reload)
exit
;;
#player)
# ;;
esac
done
} 2> /dev/null | dzen2 -w $width -x $x -y $y -fn "$font" -h $height \
-ta l -bg "$bgcolor" -fg '#efefef'
UPDATE: I use https://i3wm.org/ now
gitorious is useless
It's too hard to get code from gitorious. I tried `git clone` from gitorious's server for half an hour and failed. My similar operation on github usually succeeded (I am at Shanghai/China). I would not panic if I could copy code from its web page. And I couldn't! Gitorious screwed up my clipboard by mixing the line number in! Horrible frontend UI design. Select/copy code is easy at github is easy.
Emacs gdb/gud hotkeys
Please note if you're using Emacs 24 on OS X 10.7.3, you need `M-x gud-gdb` instead `M-x gdb` to start debug session.
It's because `M-x gdb` assume gdb 7.x installed while there is actually only gdb 6.3 installed.
- C-x C-a C-d gud-remove
- C-x C-a C-b gud-break
- C-x C-a C-g gud-run (customized by me)
- C-x C-a C-p gud-print
- C-x C-a C-r gud-continue
站立编程的副作用
- 可能导致静脉曲张
- 建议一小时休息一次
- 游泳,活动膝盖有助于减少副作用
- 一个酒吧使用的高的椅子是必需的,可以随时休息
- 好的鞋,踩在垫子上,防止受伤
结论,偶尔站立可行,但是躺者坐着似乎更安全.
Sample python code to resize image
Here is the code,
#!/usr/bin/python
import Image
import cStringIO
data=open("test.png","rb").read()
# in real application, I handle the data in memory
img=Image.open(cStringIO.StringIO(data))
img.thumbnail((800,480),Image.ANTIALIAS)
img.save("test-p.jpg","JPEG")
img.thumbnail((128,128),Image.ANTIALIAS)
img.save("test-t.jpg","JPEG")
print "DONE"
mysqldump for sqlite3
Please note that data import could be very slow in this way.
mysqldump -u root -p111111 -c --compact -t --skip-opt dbname tbl1 tbl2|sed -e "s/\\\'/''/g"|gzip -9 > data.dump.gz
zcat data.dump.gz | sqlite3 db.sqlite3
My Emacs configuration
Features
- support c++/python/perl/ruby-on-rails/javascript
- eim (Chinese Pinying IME for emacs)
- org2blog (post wordpress blog by org-mode)
Install
git clone git@github.com:redguardtoo/emacs.d.git ~/.emacs.d;
Some plugins need be compiled for better performance (OPTIONAL)
- cedet,ecb,emacs-w3m,org-mode,nxml-mode,mmm-mode,auto-complete
cd ~/.emacs.d/site-lisp;make -C cedet;make -C ecb;make -C org-mode;make -C nxml-mode;make -C auto-complete cd ~/.emacs.d/site-lisp/emacs-w3m;autoconf;./configure;make;sudo make install-info-en; cd ~/.emacs.d/site-lisp/mmm-mode;./autogen.sh;./configure;make;sudo make install-info;
sh
- rinari (install info only)
cd ~/.emacs.d/site-lisp/rinari;rake doc:make_info;sudo cp doc/rinari.info /usr/share/info;sudo install-info /usr/share/info/rinari.info /usr/share/info/dir
- eim
cd ~/.emacs.d/site-lisp/eim;emacs -batch -f batch-byte-compile *.el;
有用的emacs快捷键
- 列编辑C-x r t yourstring RET (参见How to do select column then do editing in GNU Emacs ?)
- 记录当前位置到register中 C-r SPC (需安装better-registers.el,且要注释掉其中对快捷键'C-x r'的占用)
- 跳转至某register, C-j (需better-registers.el)
- Save frame configuration to register, C-r f (要求同上)
- Comment current line, M-; (需qiang-comment-dwim-line)
- Visit the next/previous error message, M-g M-n/M-p
- find-tag/pop-tag-mark, M-./M-*
- M-x lgrep/rgrep, grep CWD only or all sub-directories
- M-x visit-tags-table, give you choice on multiple tags table
- M-x org-timer-set-timer, C-c C-x ;, set count down timer
- M-x org-mark-subtree, 选中org-mode中的subtree
Perforce Tip: how to apply my default change to the release branch
Reasons I need this hack
- Our current project uses mix platforms (WIN64/Linux64), so the file path contains backward slash
\
. - My p4 CLI program is from Windows installer because Cygwin version has the slash issue.
- Windows version of p4 has no such issue under Cygwin if we only feed it relative path.
How to?
Create the patch,
p4 diff -du -db main-branch/... > ~/mywork.patch
Go to the work directory of release branch.
cd dir-release-branch/
p4 edit
the files I want to patch under release branch.
Please note,
-
lsdiff
is from the packagepatchutils
. -
nosl
will strip the backward/forward slashes. It's written by me.
cat ~/mywork.patch|lsdiff|nosl 5|p4 -x - edit
Patch the files and DONE!
patch -p5 < ~/mywork.patch
Here is the source code of nosl
placed in my .bashrc
,
nosl ()
{
if [ -z "$1" ]; then
echo "Usage: echo /hello/world|nosl num";
echo "strip num leading slashes";
else
perl -pe "\$n=$1;while(\$n>0){ \$_=~ s/[^\\\\\\/]*[\\\\\\/]+//;\$n--; }";
fi
}
BTW, you could avoid all the trouble of Perforce by switching to Git.
UPDATE: git-p4
is better solution.