Diff for "TipsAndTricks"

Differences between revisions 17 and 85 (spanning 68 versions)

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CategoryNewFeatures

-  ⇤ ← Revision 17 as of 2006-05-02 15:38:04 → 
  Size: 4684
  Editor: ChristianEbert
  Comment: replaced "hg cat" with slightly faster "sed -i"
+   ← Revision 85 as of 2007-05-19 09:28:41 → ⇥
  Size: 2380
  Editor: 82
  Comment: None
-Deletions are marked like this.
+Additions are marked like this.
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[[TableOfContents]]

=== Make a clean copy of a source tree, like CVS export ===

{{{
hg clone source export
rm -rf export/.hg
}}}

=== The same thing, but for a tagged release ===

{{{
hg clone --noupdate source export-tagged
cd export-tagged
hg update mytag
rm -rf .hg
}}}

=== See diffs when editing commit message with VIM ===

Make a private copy of the 'hgeditor' script provided with mercurial and replace the call to the editor with following command:

{{{
vim "+e $HGTMP/diff" '+set buftype=help filetype=diff' "+vsplit $HGTMP/msg" || exit $?
}}}

This will start up VIM in vertical split mode with commit message in the left pane and diff in the right pane. The {{{buftype=help}}} setting for diff window tells vim to exit when all other windows are closed, so when you write and quit the log with {{{:x}}} ({{{:wq}}} - they are equivalent), vim exits. If you have syntax highlight set up, the diff will be properly highlighted.

This setting is suitable for wide terminals. If you have a narrow terminal, you may want to replace the {{{+vsplit}}} above with {{{+split}}} or add {{{nowrap}}} to the {{{+set}}}.

=== See diffstat of pulled changes ===

Place the following script (named "pull-diffstat" here) somewhere in your $PATH:

{{{
#!/bin/sh
test -n "$NODE" || exit 0
PARENT=`hg parents $NODE | head -1 | awk -F':' '{print $3}'`
TIP=`hg tip | head -1 | awk -F':' '{print $3}'`
echo "diffstat for $PARENT to $TIP"
hg diff -r $PARENT -r tip | diffstat
}}}

Add a changegroup entry to the [hooks] section of hgrc:

{{{
[hooks]
changegroup = pull-diffstat
}}}

Now you will see a diffstat of the new changes to your repo every time you do "hg pull".

=== One liner to remove unknown files with a pattern ===
To make these work, replace the {{{ls -l}}} with the command you wish to execute (ie. {{{rm}}}).  You can also tweak the parameters passed to {{{hg status}}} to filter by something other than unknown files (see {{{hg help status}}}).

{{{
hg status -nu0 | grep -z pattern | xargs -0r ls -l
}}}

The above command requires a current version of GNU grep.  If you don't have one, you can use the following:
{{{
hg status -nu | grep pattern | tr '\n' '\0' | xargs -0r ls -l
}}}

=== Keyword expansion according to file revision ===

This is an example on how you can achieve filewise keyword expansion (similar
to CVS) with an [encode] filter and the pretxncommit-hook.  Comes in handy
when you want to keep track of different file revisions in the same
repository.

For demonstration we use just one keyword: "Hg".

 * {{{$Hg$}}}

It will be expanded by the script "hgpretxncommit.sh" (see below) to:

 * {{{$Hg: <basename of file>,v <short hash> <date> $}}}

You have the choice between two date output formats:

 * Generic Mercurial output
 * YYYY/mm/dd

You need an [encode] filter that "reverts" the expansion in your hgrc (unless
you don't care about the expanded keyword showing up in every "hg diff").

Simple example hgrc for a repository containing python files:

{{{
[encode]
*.py = sed 's/[$]Hg[^$]*[$]/\$Hg\$/'
[hooks]
pretxncommit = hgpretxncommit.sh
}}}

In "hgpretxncommit.sh" you have to tweak the 'excl' and 'slash' variables
according to your needs. The script doesn't look at files matching $excl.
Whereas files not matching $excl but matching $slash will have the commit
date expanded as YYYY/mm/dd (like the python files in this example).

{{{
#!/bin/sh
set -e
test $? -eq 0 || exit 1
excl='^\.hg\|\.\(p\(df\|ng\)\|jpg\)$'
slash='\.\(\(te\|dt\)x\|s\(ty\|h\)\|c\(fg\|ls\)\|bib\|py\|awk\)$'
cset="${HG_NODE:0:12}"
tipv=`hg tip --verbose`
manifest=`hg manifest | cut -d ' ' -f 3`
dateformat() {
 local m M
 if echo "$f" | grep -q "$slash"; then
  hgdate=`echo "$tipv" |
  awk '/^date:  +/ { printf "%d/%s/%0.2d %s %s", $6, $3, $4, $5, $7 }'`
  m=0
  for M in Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  do
   let $((++m))
   hgdate=${hgdate/$M/`printf %0.2d $m`}
  done
 else
  hgdate=`echo "$tipv" | awk -F ': +' '/^date:  +/ { print $2 }'`
 fi
}
for f in `echo "$tipv" | awk -F ': +' '/^files:  +/ { print $2 }'`
do
 if echo "$f" | grep -v -q "$excl" && echo "$manifest" | grep -x -q "$f"
 then
  bn="${f##*/}"
  dateformat
  sed -i,hg -e "s!\([$]Hg\)[^$]*[$]!\1: ${bn},v $cset $hgdate \$!" "$f" &&
  rm "${f},hg"
 fi
done
exit $?
}}}

=== hg diff does not support -foo option like gnu diff does ===

I use the following bash function to put the diff options I like most

{{{
hgdi ()
{
  for i in `hg status -marn "$@"`
  do
    diff -ubwd <(hg cat "$i") "$i"
  done
}
}}}
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