1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
#!/usr/bin/mawk -We
# *********************************************************************
# Written by and copyright Carlo Strozzi <carlos@linux.it>.
#
# tabletosh: convert the last record of a NoSQL table into sh(1)
# variable assignments.
# Copyright (C) 1998-2001 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.
#
# 2001-02-13 Ported to NoSQL v3
# 2001-02-21 Added option '-s'
# 2001-04-18 Added inline help
# 2001-08-17 Added stdio portability
# 2001-09-03 Added options '-C' and '-L'
#
# $Id$
# *********************************************************************
BEGIN {
NULL = "" ; FS = OFS = "\t"
while (ARGV[++i] != NULL) {
if (ARGV[i] == "-p" || ARGV[i] == "--prefix") prefix = ARGV[++i]
else if ( ARGV[i] == "-c" || ARGV[i] == "--compute" ) comp = 1
else if (ARGV[i] == "-t" || ARGV[i] == "--trim") trim = 1
else if (ARGV[i] == "-T" || ARGV[i] == "--trunc") trunc = ARGV[++i]
else if (ARGV[i] == "-K" || ARGV[i] == "--key") key = ARGV[++i]
else if (ARGV[i] == "-R" || ARGV[i] == "--readonly") readonly = 1
else if (ARGV[i] == "-e" || ARGV[i] == "--export") export = 1
else if (ARGV[i] == "-i" || ARGV[i] == "--input") i_file = ARGV[++i]
else if (ARGV[i] == "-o" || ARGV[i] == "--output") o_file = ARGV[++i]
else if (ARGV[i] == "-s" || ARGV[i] == "--strip-names") {
s_pattern = ARGV[++i]
}
else if (ARGV[i] == "-C" || ARGV[i] == "--max-cols") {
max_cols = ARGV[++i]
}
else if (ARGV[i] == "-L" || ARGV[i] == "--max-rows") {
max_rows = ARGV[++i]
}
else if (ARGV[i] == "-h" || ARGV[i] == "--help") {
system("grep -v '^#' @DOCPATH@/tabletosh.txt")
rc = 1
exit(rc)
}
}
ARGC = 1 # Fix argv[]
if (o_file == NULL) o_file = "@STDOUT@"
if (i_file != NULL) { ARGV[1] = i_file; ARGC = 2 }
}
#
# Main loop
#
# Column names.
NR == 1 {
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 { next }
# Table body.
{
if (key != NULL) {
if ($1 == key) got_key = 1
else next
} else {
if (max_rows && NR > max_rows) next
}
# Make sure we output something valid in any case.
if (!comp) printf("{ :; ") > o_file
i = 0
while (P[c_names[++i]]) { # Process each field in turn.
if (max_cols && i > max_cols) break
field = $P[c_names[i]]
if (trunc) field = substr(field,1,trunc) # Truncate if requested.
# Unescape tabs and newlines first.
if (!comp) field = cNoSqlUnescape(field)
if (trim) { sub(/^ +/, NULL, field); sub(/ +$/, NULL, field) }
# Escape sh(1)/mawk(1) special characters in string.
field = cMawkBug(field) # Escape backslashes
gsub(/"/, "\\\"", field) # Escape double-quotes
s_name = c_names[i]
if (s_pattern != NULL) sub(s_pattern, NULL, s_name)
if (!comp) {
gsub(/\$/, "\\$", field)
gsub(/`/, "\\`", field)
if (export) printf(" export") > o_file
printf(" %s%s=\"%s\";", prefix, s_name, field) > o_file
if (readonly) printf(" readonly %s%s;", prefix, s_name) > o_file
} else {
printf(" %s%s=\"%s\";", prefix, s_name, field) > o_file
}
}
if (!comp) printf(" }") > o_file
printf("\n") > o_file
}
END {
if (rc) exit(rc)
if ((NR < 3) || (key != NULL && !got_key)) {
# No data rows in the input table; print empty assignments.
# Make sure we output something valid in any case.
if (!comp) printf("{ :;") > o_file
i = 0
while (P[c_names[++i]]) {
if (max_cols && i > max_cols) break
s_name = c_names[i]
if (s_pattern != NULL) sub(s_pattern, NULL, s_name)
if (!comp) {
if (export) printf(" export") > o_file
printf(" %s%s=\"%s\";", prefix, s_name, field) > o_file
if (readonly)
printf(" readonly %s%s;", prefix, s_name) > o_file
} else {
printf(" %s%s=\"%s\";", prefix, s_name, field) > o_file
}
}
if (!comp) printf(" }") > o_file
printf("\n") > o_file # In case the output goes to a file.
}
}
# *********************************************************************
# cNoSqlUnescape(string)
#
# Takes a string and translates any unescaped '\t' and '\n' strings into
# physical tabs and newlines respectively. Returns the converted string.
# *********************************************************************
function cNoSqlUnescape(s, S,i,s_length,a,escaped) {
s_length = split(s, a, "")
s_length++ # Cope with s_length==1
while (++i <= s_length) {
if (a[i] == "\\" && !escaped) { escaped = 1; continue }
if (a[i] == "n" && escaped) { S = S "\n"; escaped = 0; continue }
if (a[i] == "t" && escaped) { S = S "\t"; escaped = 0; continue }
if (escaped) { S = S "\\" a[i]; escaped = 0; continue }
S = S a[i]
}
return S
}
# *********************************************************************
# cMawkBug(string)
#
# Takes a string and turns all '\' characters into their escaped form
# '\\'. Returns the escaped string. This could be done with just a gsub(),
# but mawk(1) has a bug that makes it behave differently from other awk
# implementations:
#
# gsub(/\\/, "\\\\", field) # This works with both gawk(1)
# # and the original nawk(1).
#
# gsub(/\\/, "\\\\\\", field) # This works just with mawk(1),
# # otherwise it produces more
# # backslashes than necessary,
# # which looks rather obvious.
#
# *********************************************************************
function cMawkBug(s, a,i,j,S) {
i = split(s, a, "\\")
S = a[1]
for (j = 2; j <= i; j++) S = S "\\\\" a[j]
return S
}
#
# End of program.
#
|
