434 lines
9.9 KiB
Groff
434 lines
9.9 KiB
Groff
.\" Copyright (c) 2013-2016 Devin Teske
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 26, 2016
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.Dt DPV 1
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.Os
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.Sh NAME
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.Nm dpv
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.Nd stream data from stdin or multiple paths with dialog progress view
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.Sh SYNOPSIS
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.Nm
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.Op options
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.Ar [bytes:]label
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.Nm
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.Op options
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.Fl m
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.Ar [bytes1:]label1
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.Ar path1
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.Op Ar [bytes2:]label2 path2 ...
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.Sh DESCRIPTION
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.Nm
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provides a dialog progress view, allowing a user to see current throughput rate
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and total data transferred for one or more streams.
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.Pp
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The
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.Nm
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utility has two main modes for processing input.
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.Pp
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The default input mode, without
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.Ql Fl m ,
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.Nm
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reads bytes from standard input.
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A label for the data must be provided.
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.Pp
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The secondary input mode, with
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.Ql Fl m ,
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.Nm
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reads multiple paths
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.Pq up to 2047 or Dq ARG_MAX/2-1 ,
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sequentially.
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.Pp
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Data read in either mode is either thrown away
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.Pq default ,
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sent to a spawned instance of the program specified via
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.Ql Fl x Ar cmd ,
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or sent to a unique file specified by
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.Ql Fl o Ar file .
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.Pp
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With or without
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.Ql Fl m ,
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progress is displayed using one of
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.Xr dialog 3
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.Pq default ,
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.Xr dialog 1
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.Pq see Ql Fl D ,
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or instead
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.Xr Xdialog 1
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.Pq see Ql Fl X .
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.Pp
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The following options are available:
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.Bl -tag -width ".Fl b Ar backtitle"
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.It Fl a Ar text
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Display
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.Ar text
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below the file progress indicator(s).
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.It Fl b Ar backtitle
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Display
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.Ar backtitle
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on the backdrop, at top-left, behind the dialog widget.
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When using
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.Xr Xdialog 1 ,
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this is displayed inside the window
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.Pq at the top
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followed by a separator line.
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.It Fl d
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Debug mode.
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Print dialog prompt data to standard out and provide additional debugging on
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standard error.
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.It Fl D
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Do not use the default interface of
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.Xr dialog 3 ,
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but instead spawn an instance of
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.Xr dialog 1 .
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The path to
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.Xr dialog 1
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is taken from the
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.Ev DIALOG
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environment variable or simply
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.Dq Li dialog
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if unset or NULL.
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.It Fl h
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Produce a short syntax usage with brief option descriptions and exit.
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Output is produced on standard error.
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.It Fl i Ar format
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Customize the single-file format string used to update the status line.
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Ignored when using either
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.Ql Fl D
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or
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.Ql Fl X
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which lack the ability to display the status line
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.Pq containing bytes/rate/thread information .
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Default value
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is
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.Dq Li %'10lli bytes read @ %'9.1f bytes/sec. .
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This format is used when handling one file.
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.It Fl I Ar format
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Customize the multi-file format string used to update the status line.
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Ignored when using either
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.Ql Fl D
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or
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.Ql Fl X
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which lack the ability to display the status line
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.Pq containing bytes/rate/thread information .
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Default value
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is
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.Dq Li %'10lli bytes read @ %'9.1f bytes/sec. [%i/%i busy/wait] .
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This format is used when handling more than one file.
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.It Fl k
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Keep tite.
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Prevent visually distracting initialization/exit routines for scripts running
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.Xr dialog 1
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several times.
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.It Fl l
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Line mode. Read lines from input instead of bytes.
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.It Fl L Ar size
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Label size.
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If negative, shrink to longest label width.
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.It Fl m
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Multi-input mode.
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Instead of reading bytes from standard input, read from a set of paths
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.Pq one for each label .
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By default, each path is processed sequentially in the order given.
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.It Fl n Ar num
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Display at-most
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.Ar num
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progress indicators per screen.
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If zero, display as many as possible.
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If negative, only display the main progress indicator.
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Default is 0.
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Maximum value is 10.
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.It Fl N
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No overrun.
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If enabled, stop reading known-length inputs when input reaches stated length.
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.It Fl o Ar file
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Output data to
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.Ar file .
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The first occurrence of
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.Ql %s
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.Pq if any
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in
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.Ql Ar file
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will be replaced with the
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.Ar label
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text.
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.It Fl p Ar text
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Display
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.Ar text
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above the file progress indicator(s).
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.It Fl P Ar size
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Mini-progressbar size.
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If negative, don't display mini-progressbars
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.Pq only the large overall progress indicator is shown .
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If zero, auto-adjust based on number of files to read.
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When zero and only one file to read, defaults to -1.
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When zero and more than one file to read, defaults to 17.
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.It Fl t Ar title
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Display
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.Ar title
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atop the dialog box.
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Note that if you use this option at the same time as
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.Ql Fl X
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and
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.Ql Fl b Ar backtitle ,
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the
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.Ar backtitle
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and
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.Ar title
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are effectively switched
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.Pq see BUGS section below .
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.It Fl T
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Test mode.
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Simulate reading a number of bytes, divided evenly across the number of files,
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while stepping through each percent value of each file to process.
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Appends
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.Dq Li [TEST MODE]
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to the status line
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.Pq to override, use Ql Fl u Ar format .
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No data is actually read.
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.It Fl U Ar num
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Update status line
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.Ar num
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times per-second.
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Default value is
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.Ql Li 2 .
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A value of
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.Ql Li 0
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disables status line updates.
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If negative, update the status line as fast as possible.
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Ignored when using either
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.Ql Fl D
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or
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.Ql Fl X
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which lack the ability to display the status line
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.Pq containing bytes/rate/thread information .
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.It Fl w
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Wide mode.
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Allows long
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.Ar text
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arguments used with
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.Ql Fl p
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and
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.Ql Fl a
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to bump the dialog width.
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Prompts wider than the maximum width will wrap
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.Pq unless using Xr Xdialog 1 ; see BUGS section below .
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.It Fl x Ar cmd
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Execute
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.Ar cmd
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.Pq via Xr sh 1
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and send it data that has been read.
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Data is available to
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.Ar cmd
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on standard input.
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With
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.Ql Fl m ,
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.Ar cmd
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is executed once for each
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.Ar path
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argument.
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The first occurrence of
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.Ql %s
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.Pq if any
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in
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.Ql Ar cmd
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will be replaced with the
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.Ar label
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text.
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.It Fl X
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Enable X11 mode by using
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.Xr Xdialog 1
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instead of
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.Xr dialog 1
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or
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.Xr dialog 3 .
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.El
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.Sh ENVIRONMENT
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The following environment variables are referenced by
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.Nm :
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.Bl -tag -width ".Ev USE_COLOR"
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.It Ev DIALOG
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Override command string used to launch
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.Xr dialog 1
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.Pq requires Ql Fl D
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or
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.Xr Xdialog 1
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.Pq requires Ql Fl X ;
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default is either
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.Ql dialog
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.Pq for Ql Fl D
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or
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.Ql Xdialog
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.Pq for Ql Fl X .
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.It Ev DIALOGRC
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If set and non-NULL, path to
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.Ql .dialogrc
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file.
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.It Ev HOME
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If
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.Ql Ev $DIALOGRC
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is either not set or NULL, used as a prefix to
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.Ql .dialogrc
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.Pq i.e., Ql $HOME/.dialogrc .
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.It Ev USE_COLOR
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If set and NULL, disables the use of color when using
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.Xr dialog 1
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.Pq does not apply to Xr Xdialog 1 .
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.El
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.Sh DEPENDENCIES
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If using
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.Ql Fl D ,
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.Xr dialog 1
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is required.
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.Pp
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If using
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.Ql Fl X ,
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.Xr Xdialog 1
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is required.
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.Sh FILES
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.Bl -tag -width ".Pa $HOME/.dialogrc" -compact
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.It Pa $HOME/.dialogrc
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.El
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.Sh EXAMPLES
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Simple example to show how fast
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.Xr yes 1
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produces lines
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.Pq usually about ten-million per-second; your results may vary :
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.Bd -literal -offset indent
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yes | dpv -l yes
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.Ed
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.Pp
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Display progress while timing how long it takes
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.Xr yes 1
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to produce a half-billion lines
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.Pq usually under one minute; your results may vary :
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.Bd -literal -offset indent
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time yes | dpv -Nl 500000000:yes
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.Ed
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.Pp
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An example to watch how quickly a file is transferred using
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.Xr nc 1 :
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.Bd -literal -offset indent
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dpv -x "nc -w 1 somewhere.com 3000" -m label file
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.Ed
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.Pp
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A similar example, transferring a file from another process and passing the
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expected size to
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.Nm :
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.Bd -literal -offset indent
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cat file | dpv -x "nc -w 1 somewhere.com 3000" 12345:label
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.Ed
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.Pp
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A more complicated example:
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.Bd -literal -offset indent
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tar cf - . | dpv -x "gzip -9 > out.tgz" \\
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$( du -s . | awk '{print $1 * 1024}' ):label
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.Ed
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.Pp
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Taking an image of a disk:
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.Bd -literal -offset indent
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dpv -o disk-image.img -m label /dev/ada0
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.Ed
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.Pp
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Writing an image back to a disk:
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.Bd -literal -offset indent
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dpv -o /dev/ada0 -m label disk-image.img
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.Ed
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.Pp
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Zeroing a disk:
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.Bd -literal -offset indent
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dpv -o /dev/md42 < /dev/zero
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.Ed
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.Sh SEE ALSO
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.Xr dialog 1 ,
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.Xr sh 1 ,
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.Xr Xdialog 1 ,
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.Xr dialog 3
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.Sh HISTORY
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A
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.Nm
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utility first appeared in
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.Fx 10.2 .
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.Sh AUTHORS
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.An Devin Teske Aq dteske@FreeBSD.org
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.Sh BUGS
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.Xr Xdialog 1 ,
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when given both
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.Ql Fl -title Ar title
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.Pq see above Ql Fl t Ar title
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and
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.Ql Fl -backtitle Ar backtitle
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.Pq see above Ql Fl b Ar backtitle ,
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displays the backtitle in place of the title and vice-versa.
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.Pp
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.Xr Xdialog 1
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does not wrap long prompt texts received after initial launch.
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This is a known issue with the
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.Ql --gauge
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widget in
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.Xr Xdialog 1 .
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.Pp
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.Xr dialog 1
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does not display the first character after a series of escaped escape-sequences
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(e.g., ``\\\\n'' produces ``\\'' instead of ``\\n'').
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This is a known issue with
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.Xr dialog 1
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and does not affect
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.Xr dialog 3
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or
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.Xr Xdialog 1 .
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.Pp
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If your application ignores
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.Ev USE_COLOR
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when set and NULL before calling
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.Xr dpv 1
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with color escape sequences anyway,
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.Xr dialog 3
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and
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.Xr dialog 1
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may not render properly.
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Workaround is to detect when
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.Ev USE_COLOR
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is set and NULL and either not use color escape sequences at that time or use
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.Xr unset 1
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.Xr [ sh 1 ]
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or
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.Xr unsetenv 1
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.Xr [ csh 1 ]
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to unset
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.Ev USE_COLOR ,
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forcing interpretation of color sequences.
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This does not effect
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.Xr Xdialog 1 ,
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which renders the color escape sequences as plain text.
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See
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.Do
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embedded "\\Z" sequences
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.Dc
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in
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.Xr dialog 1
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for additional information.
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