hgweb: code selection without line numbers in file source view
All the source lines are put in a <pre> tag, which gives correct display and
copy&paste in both Chromium (WebKit) and FireFox: line numbers are not copied,
all the tabs and spaces are kept. This doesn't change the visual appearance
of the view compared to current hgweb version and doesn't use any JS code.
Also, stripes in this view are now generated clientside with CSS.
This implementation is chosen because other variants have important issues:
Strategy FF Chrome
current D,LT,E,T,L D,L
pre S,NW S,NW
pre/div/nbsp LT,E,T,TS,NW TS,NW
pre/div/br LT,E,T,NW NW
ol/li/nbsp LT,E,T,TS,AJ TS,AJ
ol/li/br LT,E,T,AJ AJ
pre/span LV LV
Legend
Strategies:
- current: implemented in hgweb before this patch, i.e. divs for each line,
and line numbers links in the div too
- pre: the whole code in one pre tag with newlines, all line numbers
in another one with 'float: left'
- pre/div/{nbsp,br}: same as just 'pre', but separate divs for each line and
or <br> instead of empty lines (otherwise they are not copied at all)
- ol/li/{nbsp,br}: a single ol with li's and divs for each line,
or <br> same as in previous strategy
- pre/span: this patch
Problems:
D = (very minor) display problems, like wrong width of leading tabs
LT = loses leading/trailing whitespace
E = loses embedded whitespace
B = loses blank lines
T = loses tabs
L = selects line numbers
LV = (only) visually selects line numbers
LVE = (only) visually selects line numbers at empty lines
S = no stripes (and no ability to easily highlight
lines-which-are-linked-at in the future)
TS = space copied instead of empty line
AJ = get anchor links only with JS (they work even without)
NW = no linewrap easily possible (in future)
As for browser versions compatibility, the CSS tricks used are supported in
(according to caniuse.com):
a) line numbers generation with 'content:' property and CSS counters:
IE 8+, all other popular browsers (in pre-WebKit Opera numbers are being copied)
b) stripes ('nth-child' selector):
IE 8+, FF 3.5+, Safari 3.2+, Opera 9.5+, all other popular browsers
c) line numbers are not visually selected ('user-select:' property):
IE 10+, Opera 15.0+, all other popular browsers
This patch is based on a demo implementation by
Martin Geisler <martin@geisler.net>.
#!/usr/bin/env python
# Filter output by pyflakes to control which warnings we check
import sys, re, os
def makekey(typeandline):
"""
for sorting lines by: msgtype, path/to/file, lineno, message
typeandline is a sequence of a message type and the entire message line
the message line format is path/to/file:line: message
>>> makekey((3, 'example.py:36: any message'))
(3, 'example.py', 36, ' any message')
>>> makekey((7, 'path/to/file.py:68: dummy message'))
(7, 'path/to/file.py', 68, ' dummy message')
>>> makekey((2, 'fn:88: m')) > makekey((2, 'fn:9: m'))
True
"""
msgtype, line = typeandline
fname, line, message = line.split(":", 2)
# line as int for ordering 9 before 88
return msgtype, fname, int(line), message
lines = []
for line in sys.stdin:
# We whitelist tests (see more messages in pyflakes.messages)
pats = [
r"imported but unused",
r"local variable '.*' is assigned to but never used",
r"unable to detect undefined names",
]
for msgtype, pat in enumerate(pats):
if re.search(pat, line):
break # pattern matches
else:
continue # no pattern matched, next line
fn = line.split(':', 1)[0]
f = open(os.path.join(os.path.dirname(os.path.dirname(__file__)), fn))
data = f.read()
f.close()
if 'no-' 'check-code' in data:
continue
lines.append((msgtype, line))
for msgtype, line in sorted(lines, key = makekey):
sys.stdout.write(line)
print