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
|
.\" Copyright (c) 2007-2015 The OpenRC Authors.
.\" See the Authors file at the top-level directory of this distribution and
.\" https://github.com/OpenRC/openrc/blob/master/AUTHORS
.\"
.\" This file is part of OpenRC. It is subject to the license terms in
.\" the LICENSE file found in the top-level directory of this
.\" distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
.\" This file may not be copied, modified, propagated, or distributed
.\" except according to the terms contained in the LICENSE file.
.\"
.Dd Mar 16, 2008
.Dt EINFO 3 SMM
.Os OpenRC
.Sh NAME
.Nm einfo , ewarn , eerror , ebegin ,
.Nm einfon , ewarnn , eerrorn , ebeginn ,
.Nm einfov , ewarnv , ebeginv ,
.Nm einfovn , ewarnvn , ebeginvn ,
.Nm ewarnx , eerrorx ,
.Nm eend , ewend ,
.Nm eendv , ewendv ,
.Nm ebracket ,
.Nm eindent , eoutdent ,
.Nm eindentv , eoutdentv ,
.Nm eprefix
.Nd colorful informational output
.Sh LIBRARY
Enhanced Information output library (libeinfo, -leinfo)
.Sh SYNOPSIS
.In einfo.h
.Ft int Fn einfo "const char * restrict format" ...
.Ft int Fn ewarn "const char * restrict format" ...
.Ft int Fn eerror "const char * restrict format" ...
.Ft int Fn ebegin "const char * restrict format" ...
.Ft int Fn einfon "const char * restrict format" ...
.Ft int Fn ewarnn "const char * restrict format" ...
.Ft int Fn eerrorn "const char * restrict format" ...
.Ft int Fn ebeginn "const char * restrict format" ...
.Ft int Fn einfov "const char * restrict format" ...
.Ft int Fn ewarnv "const char * restrict format" ...
.Ft int Fn ebeginv "const char * restrict format" ...
.Ft int Fn einfovn "const char * restrict format" ...
.Ft int Fn ewarnvn "const char * restrict format" ...
.Ft int Fn ebeginvn "const char * restrict format" ...
.Ft int Fn ewarnx "const char * restrict format" ...
.Ft int Fn eerrorx "const char * restrict format" ...
.Ft int Fn eend "int retval" "const char * restrict format" ...
.Ft int Fn ewend "int retval" "const char * restrict format" ...
.Ft int Fn eendv "int retval" "const char * restrict format" ...
.Ft int Fn ewendv "int retval" "const char * restrict format" ...
.Ft void Fn ebracket "int col" "ECOLOR color" "const char * restrict msg"
.Ft void Fn eindent void
.Ft void Fn eoutdent void
.Ft void Fn eindentv void
.Ft void Fn eoutdentv void
.Ft void Fn eprefix "const char * prefix"
.Sh DESCRIPTION
The
.Fn einfo
family of functions provide a simple informational output that is colorised.
Basically
.Fn einfo ,
.Fn ewarn
and
.Fn eerror
behave exactly like
.Fn printf
but prefix the output with a colored *. The function called denotes the color
used with
.Fn einfo
being green,
.Fn ewarn
being yellow and
.Fn eerror
being red.
einfo goes to stdout and the others go to stderr.
The number of real characters printed is returned.
.Fn ebegin
is identical to
.Fn einfo
except that 3 dots are appended to the output.
.Pp
.Fn einfov ,
.Fn ewarnv
and
.Fn ebeginv
work the same way to
.Fn einfo ,
.Fn ewarn ,
and
.Fn ebegin
respectively, but only work when
.Va EINFO_VERBOSE
is true. You can also make the
.Fn einfo ,
.Fn ewarn ,
and
.Fn ebegin
functions silent by setting
.Va EINFO_QUIET
to true.
.Pp
These functions are designed to output a whole line, so they also
append a newline to the string. To stop this behaviour, you can use the
functions
.Fn einfon ,
.Fn ewarnn ,
.Fn eerrorn ,
.Fn einfovn ,
.Fn ewarnvn ,
and
.Fn ebeginvn .
.Pp
.Fn eend ,
.Fn ewend ,
.Fn eendv
and
.Fn ewendv
are the counterparts to the above functions. If
.Fa retval
is zero then ok in green is printed in a bracket at the end of the prior
line. Otherwise we print the formatted string using
.Fn error
(or
.Fn ewarn
if
.Fn ewend
is called) !! in red (or yellow if
.Fn ewend
is called) is printed in a bracket at the end of the line.
The value of
.Fa retval
is returned.
.Pp
.Fn ebracket
does the same as
.Fn eend
but prints
.Fa msg
instead of ok or !! in the color
.Fa color
at the column
.Fa col .
.Pp
.Fn eindent
indents subsequent calls to the above functions by 3 characters.
.Fn eoutdent
removes an
.Fn eindent .
.Fn eindentv
and
.Fn eoutdentv
only work when
.Va EINFO_VERBOSE
is true.
.Pp
.Fn eprefix
prefixes the string
.Fa prefix
to the above functions.
.Sh IMPLEMENTATION NOTES
einfo can optionally be linked against the
.Lb libtermcap
so that we can correctly query the connected console for our color and
cursor escape codes.
If not, then we have a hard coded list of terminals we know about that support
the commonly used codes for color and cursor position.
.Sh ENVIRONMENT
.Va EINFO_QUIET
when set to true makes the
.Fn einfo
and
.Fn einfon
family of functions quiet, so nothing is printed.
.Va EERROR_QUIET
when set to true makes the
.Fn eerror
and
.Fn eerrorn
family of functions quiet, so nothing is printed.
.Pp
.Va EINFO_VERBOSE
when set to true makes the
.Fn einfov
and
.Fn einfovn
family of functions work, so they do print.
.Sh FILES
.Pa /etc/init.d/functions.sh
is provided by OpenRC, which allows shell scripts to use the above functions.
For historical reasons our verbose functions are prefixed with v instead of
suffixed. So einfov becomes veinfo, einfovn becomes veinfon.
Rinse and repeat for the other verbose functions.
.Sh SEE ALSO
.Xr printf 3 ,
.Sh AUTHORS
.An Roy Marples <roy@marples.name>
|
