'\"
'\" Generated from file 'debug\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 200?, Colin McCormack, Wub Server Utilities
'\" Copyright (c) 2012-2014, Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>
'\"
.TH "debug" n 1\&.0\&.7 tcllib "debug narrative"
.\" The -*- nroff -*- definitions below are for supplemental macros used
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\h'-1.5n'\L'|\\n(^yu-1v'\h'\\n(^lu+3n'\L'\\n(^tu+1v-\\n(^yu'\l'|0u-1.5n\(ul'
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.LP
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See the \\*(So manual entry for details on the standard options.
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Command-Line Name:	\\fB\\$1\\fR
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.\"	# MT - "empty" string
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.BS
.SH NAME
debug \- debug narrative - core
.SH SYNOPSIS
package require \fBTcl 8\&.5 9\fR
.sp
package require \fBdebug ?1\&.0\&.7?\fR
.sp
\fBdebug\&.\fR\fBtag\fR \fImessage\fR ?\fIlevel\fR?
.sp
\fBdebug\fR \fB2array\fR
.sp
\fBdebug\fR \fBdefine\fR \fItag\fR
.sp
\fBdebug\fR \fBheader\fR \fItext\fR
.sp
\fBdebug\fR \fBlevel\fR \fItag\fR ?\fIlevel\fR? ?\fIfd\fR?
.sp
\fBdebug\fR \fBnames\fR
.sp
\fBdebug\fR \fBoff\fR \fItag\fR
.sp
\fBdebug\fR \fBon\fR \fItag\fR
.sp
\fBdebug\fR \fBparray\fR \fIarrayvarname\fR
.sp
\fBdebug\fR \fBpdict\fR \fIdict\fR
.sp
\fBdebug\fR \fBhexl\fR \fIdata\fR ?\fIprefix\fR?
.sp
\fBdebug\fR \fBnl\fR
.sp
\fBdebug\fR \fBtab\fR
.sp
\fBdebug\fR \fBprefix\fR \fItag\fR ?\fItext\fR?
.sp
\fBdebug\fR \fBsetting\fR (\fItag\fR \fIlevel\fR) \&.\&.\&. ?\fIfd\fR?
.sp
\fBdebug\fR \fBsuffix\fR \fItag\fR ?\fItext\fR?
.sp
\fBdebug\fR \fBtrailer\fR \fItext\fR
.sp
.BE
.SH DESCRIPTION
Debugging areas of interest are represented by 'tags' which have
independently settable levels of interest (an integer, higher is more
detailed)\&.
.SH API
.TP
\fBdebug\&.\fR\fBtag\fR \fImessage\fR ?\fIlevel\fR?
For each known tag the package creates a command with this signature
the user can then use to provide the debug narrative of the tag\&.
The narrative \fImessage\fR is provided as a Tcl script whose value is
\fBsubst\fRed in the caller's scope if and only if the current level of
interest for the \fItag\fR matches or exceeds the call's \fIlevel\fR
of detail\&.  This is useful, as one can place arbitrarily complex
narrative in code without unnecessarily evaluating it\&.
.sp
See methods \fBlevel\fR and \fBsetting\fR for querying
and manipulating the current level of detail for tags\&.
.sp
The actually printed text consists of not only the
\fImessage\fR, but also global and tag-specific prefix and suffix,
should they exist, with each line in the message having the specified
headers and trailers\&.
.sp
All these parts are \fBsubst\fRableTcl scripts, which are
substituted once per message before assembly\&.
.TP
\fBdebug\fR \fB2array\fR
This method returns a dictionary mapping the names of all debug tags
currently known to the package to their state and log level\&. The
latter are encoded in a single numeric value, where a negative number
indicates an inactive tag at the level given by the absolute value, and
a positive number is an active tag at that level\&.
.sp
See also method \fBsettings\fR below\&.
.TP
\fBdebug\fR \fBdefine\fR \fItag\fR
This method registers the named \fItag\fR with the package\&.  If the
tag was not known before it is placed in an inactive state\&. The state
of an already known tag is left untouched\&.
.sp
The result of the method is the empty string\&.
.TP
\fBdebug\fR \fBheader\fR \fItext\fR
This method defines a global \fBsubst\fRable Tcl script which provides
a text printed before each line of output\&.
.sp
Note how this is tag-independent\&.
.sp
Further note that the header substitution happens only once per
actual printed message, i\&.e\&. all lines of the same message will have
the same actual heading text\&.
.sp
The result of the method is the specified text\&.
.TP
\fBdebug\fR \fBlevel\fR \fItag\fR ?\fIlevel\fR? ?\fIfd\fR?
This method sets the detail-\fIlevel\fR for the \fItag\fR, and the
channel \fIfd\fR to write the tags narration into\&.
The level is an integer value >= 0 defaulting to \fB1\fR\&.
The channel defaults to \fBstderr\fR\&.
.sp
The result of the method is the new detail-level for the tag\&.
.TP
\fBdebug\fR \fBnames\fR
This method returns a list containing the names of all debug tags
currently known to the package\&.
.TP
\fBdebug\fR \fBoff\fR \fItag\fR
This method registers the named \fItag\fR with the package and sets it
inactive\&.
.sp
The result of the method is the empty string\&.
.TP
\fBdebug\fR \fBon\fR \fItag\fR
This method registers the named \fItag\fR with the package, as active\&.
.sp
The result of the method is the empty string\&.
.TP
\fBdebug\fR \fBparray\fR \fIarrayvarname\fR
This is a convenience method formatting the named array like the
builtin command \fBparray\fR, except it returns the resulting string
instead of writing it directly to \fBstdout\fR\&.
.sp
This makes it suitable for use in debug messages\&.
.TP
\fBdebug\fR \fBpdict\fR \fIdict\fR
This is a convenience method formatting the dictionary similarly to
how the builtin command \fBparray\fR does for array, and returns the
resulting string\&.
.sp
This makes it suitable for use in debug messages\&.
.TP
\fBdebug\fR \fBhexl\fR \fIdata\fR ?\fIprefix\fR?
This is a convenience method formatting arbitrary data into a hex-dump
and returns the resulting string\&.
.sp
This makes it suitable for use in debug messages\&.
.sp
Each line of the dump is prefixed with \fIprefix\fR\&. This prefix
defaults to the empty string\&.
.TP
\fBdebug\fR \fBnl\fR
This is a convenience method to insert a linefeed character (ASCII 0x0a)
into a debug message\&.
.TP
\fBdebug\fR \fBtab\fR
This is a convenience method to insert a TAB character (ASCII 0x09)
into a debug message\&.
.TP
\fBdebug\fR \fBprefix\fR \fItag\fR ?\fItext\fR?
This method is similar to the method \fBheader\fR above, in that it
defines \fBsubst\fRable Tcl script which provides more text for debug
messages\&.
.sp
In contrast to \fBheader\fR the generated text is added to the
user's message before it is split into lines, making it a per-message
extension\&.
.sp
Furthermore the script is tag-dependent\&.
.sp
In exception to that, a script for tag \fB::\fR is applied
to all messages\&.
.sp
If both global and tag-dependent prefix exist, both are
applied, with the global prefix coming before the tag-dependent
prefix\&.
.sp
Note that the prefix substitution happens only once per
actual printed message\&.
.sp
The result of the method is the empty string\&.
.sp
If the \fItag\fR was not known at the time of the call it is
registered, and set inactive\&.
.TP
\fBdebug\fR \fBsetting\fR (\fItag\fR \fIlevel\fR) \&.\&.\&. ?\fIfd\fR?
This method is a multi-tag variant of method \fBlevel\fR above,
with the functionality of methods \fBon\fR, and \fBoff\fR also
folded in\&.
.sp
Each named \fItag\fR is set to the detail-\fIlevel\fR following
it, with a negative level deactivating the tag, and a positive level
activating it\&.
.sp
If the last argument is not followed by a level it is not
treated as tag name, but as the channel all the named tags should
print their messages to\&.
.sp
The result of the method is the empty string\&.
.TP
\fBdebug\fR \fBsuffix\fR \fItag\fR ?\fItext\fR?
This method is similar to the method \fBtrailer\fR below, in that
it defines \fBsubst\fRable Tcl script which provides more text for
debug messages\&.
.sp
In contrast to \fBtrailer\fR the generated text is added to
the user's message before it is split into lines, making it a
per-message extension\&.
.sp
Furthermore the script is tag-dependent\&.
.sp
In exception to that, a script for tag \fB::\fR is applied
to all messages\&.
.sp
If both global and tag-dependent suffix exist, both are
applied, with the global suffix coming after the tag-dependent suffix\&.
.sp
Note that the suffix substitution happens only once per actual
printed message\&.
.sp
The result of the method is the empty string\&.
.sp
If the \fItag\fR was not known at the time of the call it is
registered, and set inactive\&.
.TP
\fBdebug\fR \fBtrailer\fR \fItext\fR
This method defines a global \fBsubst\fRable Tcl script which provides
a text printed after each line of output (before the EOL however)\&.
.sp
Note how this is tag-independent\&.
.sp
Further note that the trailer substitution happens only once
per actual printed message, i\&.e\&. all lines of the same message will
have the same actual trailing text\&.
.sp
The result of the method is the specified text\&.
.PP
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such in the category \fIdebug\fR of the
\fITcllib Trackers\fR [http://core\&.tcl\&.tk/tcllib/reportlist]\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.PP
When proposing code changes, please provide \fIunified diffs\fR,
i\&.e the output of \fBdiff -u\fR\&.
.PP
Note further that \fIattachments\fR are strongly preferred over
inlined patches\&. Attachments can be made by going to the \fBEdit\fR
form of the ticket immediately after its creation, and then using the
left-most button in the secondary navigation bar\&.
.SH KEYWORDS
debug, log, narrative, trace
.SH CATEGORY
debugging, tracing, and logging
.SH COPYRIGHT
.nf
Copyright (c) 200?, Colin McCormack, Wub Server Utilities
Copyright (c) 2012-2014, Andreas Kupries <andreas_kupries@users\&.sourceforge\&.net>

.fi
