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#!/usr/bin/mawk -We
# *********************************************************************
# Written by and copyright Carlo Strozzi <carlos@linux.it>.
#
# update: inserts/updates/deletes table rows based on the contents
# of an edit table.
# Copyright (C) 2000-2001 Carlo Strozzi <carlos@linux.it>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# 2001-01-03 Ported to NoSQL v3
# 2001-01-13 Added option '-w'
# 2001-03-20 'table_2' may be itself a Table Journal.
# 2001-04-18 Added inline help
# 2001-08-17 Added stdio portability
#
# $Id$
# *********************************************************************
BEGIN {
NULL = "" ; FS = OFS = "\t"; d_string = "..DEL.."
while (ARGV[++i] != NULL) {
if (ARGV[i] == "-d" || ARGV[i] == "--delete") d_string = ARGV[++i]
else if (ARGV[i] == "-N" || ARGV[i] == "--no-header") no_hdr = 1
else if (ARGV[i] == "-l" || ARGV[i] == "--last") pick_last = 1
else if (ARGV[i] == "-s" || ARGV[i] == "--stdin") swap = 1
else if (ARGV[i] == "-w" || ARGV[i] == "--write-size") s_file = ARGV[++i]
else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
system("grep -v '^#' @DOCPATH@/update.txt")
rc = 1
exit(rc)
}
else if (ARGV[i] !~ /^-/) e_file = ARGV[i]
}
if (e_file == NULL) {
print "Usage: update [options] table_1 < table_2" > "@STDERR@"
exit(1)
}
#
# Load the associative array with the updates.
#
i = 0
if (swap) {
while (getline < "-" > 0) { # Read updates from stdin.
if (++j == 1) {
while (++i <= NF) {
if (pick_last) ep[$i] = i
else if (ep[$i] == NULL) ep[$i] = i
}
} else {
if (j > 2) {
edits[$1] = $0 # Edit array.
keys[$1] = 1 # Key array.
}
}
}
close(stdin) # Let's spare resources.
ARGV[1] = e_file # Set new stdin stream.
} else { # Read updates from e_file.
while (getline < e_file > 0) {
if (++j == 1) {
while (++i <= NF) {
if (pick_last) ep[$i] = i
else if (ep[$i] == NULL) ep[$i] = i
}
} else {
if (j > 2) {
edits[$1] = $0 # Edit array.
keys[$1] = 1 # Key array.
}
}
}
close(e_file) # Let's spare resources.
ARGV[1] = "-"
}
if (s_file != NULL) print j-2 > s_file
close(s_file)
NR = 0 # Reset record counter.
NF = 0
ARGC = 2 # Fix argv[].
edit_numfields = split($0, n) # No. of fields in edit table.
}
# At this point whichever file we have on stdin it is always
# the one that is being updated.
NR == 1 {
old_numfields = split($0, n) # No. of fields in main table.
if (!no_hdr) print
i = 0
while (++i <= NF) {
if (!P[$i]) {
if (i == 1) auto_col = $i
else auto_col = auto_col " " $i
}
if (pick_last) P[$i] = i
else {
if (!P[$i]) P[$i] = i
}
}
split(auto_col, c_names, " ")
next
}
# Dashline.
NR == 2 {
if (!no_hdr) { print; fflush() }
next
}
#
# Apply the updates to already existing keys.
#
split(edits[$1], a) { # Something to do ?
status[$1] = 1 # Mark key as updated.
if (a[2] == d_string) next # Skip this record.
printf("%s", a[1])
for (i = 2; i <= NF; i++) {
if (ep[c_names[i]]) repl = a[ep[c_names[i]]]
else {
#
# This is to cope with the case where 'table_2'
# itself contains delete strings in column 2,
# i.e. when we use 'update' against a Table Journal.
#
if ($i == d_string) $i = NULL
repl = $i
}
printf("\t%s", repl)
}
printf("\n") # Print record separator.
next
}
{ print }
END {
if (rc) exit(rc)
# Now handle new keys, i.e. edits referring to keys that do not
# occur in the file being updated. This is to cope with 'insert'
# operations.
for (j in keys) {
split(edits[j], a)
if (status[j] || a[2] == d_string) continue
printf("%s", a[1])
for (i = 2; i <= old_numfields; i++) {
if (ep[c_names[i]]) repl = a[ep[c_names[i]]]
else repl = NULL
printf("\t%s", repl)
}
printf("\n") # Print record separator.
}
}
#
# End of program.
#
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