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#!/usr/local/bin/perl
# Merge conflicted ChangeLogs
# tromey Mon Aug 15 1994
# Due to popular demand, I'm posting my ChangeLog auto-merge tool. Run
# this on your ChangeLog files when an update leaves them conflicted.
# The code is appended.
#
# Usage is:
#
# cl-merge [-i] file ...
#
# With -i, it works in place (backups put in a ~ file). Otherwise the
# merged ChangeLog is printed to stdout.
#
# Style comments are welcome. This is my third perl program ever.
#
# Please report any bugs to me. I wrote this yesterday, so there are no
# guarantees about its performance. I recommend checking its output
# carefully. If you do send a bug report, please includie the failing
# ChangeLog, so I can include it in my test suite.
#
# Tom
# ---
# tromey@busco.lanl.gov Member, League for Programming Freedom
# Sadism and farce are always inexplicably linked.
# -- Alexander Theroux
# If '-i' is given, do it in-place.
if ($ARGV[0] eq '-i') {
shift (@ARGV);
$^I = '~';
}
$lastkey = '';
$lastval = '';
$conf = 0;
%conflist = ();
$tjd = 0;
# Simple state machine. The states:
#
# 0 Not in conflict. Just copy input to output.
# 1 Beginning an entry. Next non-blank line is key.
# 2 In entry. Entry beginner transitions to state 1.
while (<>) {
if (/^<<<</ || /^====/) {
# Start of a conflict.
# Copy last key into array.
if ($lastkey ne '') {
$conflist{$lastkey} = $lastval;
$lastkey = '';
$lastval = '';
}
$conf = 1;
} elsif (/^>>>>/) {
# End of conflict. Output.
# Copy last key into array.
if ($lastkey ne '') {
$conflist{$lastkey} = $lastval;
$lastkey = '';
$lastval = '';
}
foreach (reverse sort clcmp keys %conflist) {
print STDERR "doing $_" if $tjd;
print $_;
print $conflist{$_};
}
$lastkey = '';
$lastval = '';
$conf = 0;
%conflist = ();
} elsif ($conf == 1) {
# Beginning an entry. Skip empty lines. Error if not a real
# beginner.
if (/^$/) {
# Empty line; just skip at this point.
} elsif (/^[MTWFS]/) {
# Looks like the name of a day; assume opener and move to
# "in entry" state.
$lastkey = $_;
$conf = 2;
print STDERR "found $_" if $tjd;
} else {
die ("conflict crosses entry boundaries: $_");
}
} elsif ($conf == 2) {
# In entry. Copy into variable until we see beginner line.
if (/^[MTWFS]/) {
# Entry beginner line.
# Copy last key into array.
if ($lastkey ne '') {
$conflist{$lastkey} = $lastval;
$lastkey = '';
$lastval = '';
}
$lastkey = $_;
print STDERR "found $_" if $tjd;
$lastval = '';
} else {
$lastval .= $_;
}
} else {
# Just copy.
print;
}
}
%months = ('Jan', 0,
'Feb', 1,
'Mar', 2,
'Apr', 3,
'May', 4,
'Jun', 5,
'Jul', 6,
'Aug', 7,
'Sep', 8,
'Oct', 9,
'Nov', 10,
'Dec', 11);
# Compare ChangeLog time strings like <=>.
#
# 0 1 2 3
# Thu Aug 11 13:22:42 1994 Tom Tromey (tromey@creche.colorado.edu)
# 0123456789012345678901234567890
#
sub clcmp {
# First check year.
$r = substr ($a, 20, 4) <=> substr ($b, 20, 4);
# Now check month.
$r = $months{$a} <=> $months{$b} if !$r;
# Now check day.
$r = substr ($a, 8, 2) <=> substr ($b, 8, 2) if !$r;
# Now check time (3 parts).
$r = substr ($a, 11, 2) <=> substr ($b, 11, 2) if !$r;
$r = substr ($a, 14, 2) <=> substr ($b, 14, 2) if !$r;
$r = substr ($a, 17, 2) <=> substr ($b, 17, 2) if !$r;
$r;
}
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