tdl.1

.TH "tdl" 1 "May 2003" "1.4"
.SH NAME
tdl \- To do list manager
.SH SYNOPSIS
tdl  [\-q]
.br
tdl  [\-q] add|edit|defer|log
.br
tdl  [\-q] list|done|undo|report
.br
tdl  [\-q] remove|above|below|into|clone|copyto
.br
tdl  [\-q] postpone|ignore|open
.br
tdl  [\-q] which|version|help
.br
tdla [\-q]
.br
tdll [\-q]
.br
tdls [\-q]
.br
tdld [\-q]
.br
tdlg [\-q]

.SH DESCRIPTION
A program for managing a to-do list.
.PP
tdl has a set of functions that can be accessed in two different ways:

    * Directly from the command line
    * Interactively

In the 'direct' method, the function and its arguments are provided on the 
command line. This mode is useful if you only want to perform a single 
operation. An example

    % tdl add "A task"
    %

The 'interactive' method is entered when the tdl command is run with no 
arguments. In this mode, many tdl operations may be performed within a 
single run of the program. This avoids loading and saving the database 
for each operation, which may have a small performance benefit. 
However, if the program is compiled with the readline library, the 
<tab> key will provide various completion functions. An example

    % tdl
    tdl> add "A task"
    tdl> exit
    %

When in interactive mode, these methods can be used to exit and return 
to the shell:

* The 
.B exit 
command (see exit command)
.br
* Hitting <Ctrl-D> (i.e. end of file on stdin)
.br
* Hitting <Ctrl-C>, <Ctrl-\> etc. The associated signals are caught by 
tdl and it will attempt to save the database. However, this method is 
more risky than the first two.
.br
* The 
.B quit 
command (see quit command). Caution: this does not save the 
modified database back to the disk. Only use it if you want to discard 
all changes made in this tdl run. 

.pp
All forms may take
.I \-q
as the first command line argument.  Currently, this suppresses the warning
message if no existing database can be found.  The intended use is for using
.B tdll
when changing into a directory, to list outstanding work in that directory.
.PP
Any command that modifies the database will rename the old database to a file
called
.B .tdldb.bak
before writing out the new
.B .tdldb
(The backup file will be in the same directory as the main one.)  This allows
for one level of database recovery, if the database is corrupted or a command
is issued in error which causes large losses of data (e.g. misuse of the
.B remove
command.)


.SH SUBCOMMANDS
.B tdl above
.I index_to_insert_above
.I index_to_move ...
.br
.B tdl before
.I index_to_insert_above
.I index_to_move ...
.PP
This command moves one or more entries to a new location in the tree.  The
first index specifies the entry which will end up immediately below the moved
entries after the operation.  As a special case, you can specify the final
component of the first argument as zero.  In this case, the moved entries
appear as the last children of the parent node afterwards.
.P
.ce 1
--ooOOoo--
.PP
.B tdl add
.I [@datespec]
.I [parent_index]
.I [priority]
.I text_for_node
.br
.B tdla
.I [@datespec]
.I [parent_index]
.I [priority]
.I text_for_node
.PP
The
.B add
command is used to add a new entry to the database.
.PP
.B datespec
is the time at which the entry will be visible when the database is printed
with the
.B list
command.  It defaults to now.  The format for datespec is described in the
.B "DATE SPECIFICATION"
section later in this page.
.PP
.B parent_index
is the index of the parent node (e.g. 1 or 2.4).  This defaults to the root
node if missing, i.e. a new top-level entry is created.
.PP
.B priority is one of
.IR urgent ,
.IR high ,
.IR normal ,
.IR low " or"
.IR verylow .
Normal is the default if this argument is not specified.  Priorities may be
abbreviated (even to just the first letter.)
.PP
.B text_for_node
is the text describing the task for this entry.  If this is more than a single
word, you will need to quote it to make the shell keep it as a single argument
to tdl.  The text may span multiple lines (i.e. if you hit return whilst the
quotation marks are still open in the shell.)
.PP
If no database exists, the
.B add
command will create it automatically (in the current directory, unless the
.B TDL_DATABASE
environment is set, in which case this specifies the path to use).
.P
.ce 1
--ooOOoo--
.PP
.B tdl below
.I index_to_insert_below
.I index_to_move ...
.br
.B tdl after
.I index_to_insert_below
.I index_to_move ...
.PP
This command moves one or more entries to a new location in the tree.  The
first index specifies the entry which will end up immediately above the moved
entries after the operation.  As a special case, you can specify the final
component of the first argument as zero.  In this case, the moved entries
appear as the first children of the parent node afterwards.
.P
.ce 1
--ooOOoo--
.PP
.B tdl clone
.I index_to_clone ...
.PP
The clone command can be used to make a deep copy of one or more entries and 
add them as new top-level entries in the database. You might use this if you 
have a task with a set of subtasks, and find that the same subtasks apply to 
some new task. You could copy the first task, and edit the new top-level task 
to change its text. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl copyto
.I new_parent_index
.I index_to_clone ...
.PP
The copyto command is very similar to the 
.B clone 
command. The difference is that copyto inserts the newly created entries as 
children of an existing entry, rather than making them new top level entries. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl create
.PP
This command is used to create a .tdldb file in the current
directory (or at the location specified by the environment variable
TDL_DATABASE).  If the database file is already found to exist, a warning will
be printed and the command has no effect.
.PP
The situation where you are likely to use this command is where there is
already a .tdldb file in another directory further up the path from this one.
Most of the tdl commands will find and use this other database file, assuming
that you want to share it across all the directories in the tree.  You might
want to use a single database across an entire large project, for example.  The
.B create
command will ignore any .tdldb file found in an ancestor directory.  It always
operates in either the current directory or on the file pointed to by
TDL_DATABASE.
.P
.ce 1
--ooOOoo--
.PP
.B tdl defer
.I [@datespec]
.I index_to_change...
.PP
The defer command is used to modify the start-time of one or more existing entries, 
where the @ on the datespec is optional because the argument is required, although 
the @ can be included for consistency with other commands where a datespec is optional. 
.PP
An example of use is 
.P
	tdl> defer @+fri 1 2.1... 5
.P
which defers entries 1, 2.1 and all its children, and 5 until the following Friday. 
To list deferred entries, use 
.I list \-p
, to defer entries indefinitely, see 
.I postpone 
command. 
To re-activate deferred or postponed entries, see 
.I open 
command. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl done
.I @datespec
.I index_of_done_entry ...
.br
.B tdld
.I @datespec
.I index_of_done_entry ...
.PP
The
.B done
command is used to mark one or more tasks as completed.  The effects are as follows:
.IP o
The entries no longer appear on the default listing (tdl list / tdll)
.IP o
The entries are eligible to appear on the report list (tdl report)
.IP o
The entries are eligible for removal by the purge command (tdl purge.)
.PP
If the string "..." is appended to an index, it means that entry and all its
descendents.  This provides a quick way to mark a whole sub-tree of tasks as
being completed.
.PP
.B datespec
is the time at which the entry/entries should be marked as having been
completed.  The default is to mark them completed at the current time.  The
competion time of an entry affects whether it is shown by the
.B report
command for a particular range of reported times.
.PP
The format for datespec is described in the
.B "DATE SPECIFICATION"
section later in this page.
.P
.ce 1
--ooOOoo--
.PP
.B tdl edit
.I index_to_change
.I [new_text]
.PP
This command is used to change the text of an entry.  If no [new-text] is
provided, you will be prompted with the old text to edit interactively. (This
is only useful if the GNU readline library has been linked in.)
.PP
Note, in earlier versions, edit could be used to change the start-time of one 
or more entries. This is now handled by the 
.B defer 
command.
.P
.ce 1
--ooOOoo--
.PP
.B exit
.PP
The exit command is used to exit from tdl when it is used in interactive mode. 
The exit command is not available in the command line mode, where it would not 
make sense. 
.br
The exit command writes any pending updates to the database before exiting. 
Compare the 
.B quit 
command, which loses all updates made during the current tdl run. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl export
.I filename
.I index_to_export ...
.PP
This command is used to create a new TDL database (whose name is given by the
.I filename
argument).  The initial contents of the new database are the entries specified
by the list of indices following the filename, in that order.  Each index
becomes a top-level entry of the new database.  The operation is read-only on
the original database.
.P
.ce 1
--ooOOoo--
.PP
.B tdl help
.PP
This command displays a summary of use of each of the commands.
.P
.ce 1
--ooOOoo--
.PP
.B tdl ignore
.I index_to_ignore ...
.PP
The ignore command puts one or more entries into an ignored state. It is 
actually implemented in the same way as marking them as done, but as though 
they were done a very long time ago. Thus, ignored entries will be deleted 
by any subsequent purge operation.
.br
I added this feature because, when applying remove to several entries, I kept 
getting tripped up by the indices changing below the entry that was removed 
(I kept removing the wrong entries later by not using the revised indices). 
Instead, I can ignore them and rely on a periodic purge to clean up the database.
.br
Another use for the ignore command would be to move moribund entries into a 
wastebasket to stop them cluttering up the normal listing, but without removing 
them entirely in case you need to reprieve them later. 
.br
If you need to un-ignore an entry, just 
.B undo 
it
.P
.ce 1
--ooOOoo--
.PP
.B tdl import
.I filename
.PP
This command is used to merge entries from the TDL database
.I filename
into the default TDL database (i.e. the one that most of the other commands
would be accessing).
.PP
You might use this command if you had a number of separate TDL databases, and
wanted to merge their entries to form one combo database.
.P
.ce 1
--ooOOoo--
.PP
.B tdl into
.I new_parent_index
.I indices_to_move ...
.PP
This command moves one or more entries under a new parent entry.  It is
equivalent to the
.B above
command when the
.B new_parent_index
argument has ".0" appended to it.
.P
.ce 1
--ooOOoo--
.PP
.B tdl list
.I [\-v]
.I [\-a]
.I [\-p]
.I [\-m]
.I [\-1...9]
.I [<min-priority>]
.I [<parent_index>|<search_conditions>...]
.br
.B tdll
.I [\-v]
.I [\-a]
.I [\-p]
.I [\-m]
.I [\-1...9]
.I [<min-priority>]
.I [<parent_index>|<search_conditions...]
.br
.B tdls
.I [\-v]
.I [\-a]
.I [\-p]
.I [\-m]
.I [\-1...9]
.I [<min-priority>]
.I [<parent_index>|<search_conditions...]
.PP
The
.B list
or it's synonymous
.B ls
command is used to display the entries in the database.  By default, only
entries that have not been marked
.B done
and which don't have start times deferred into the future are shown.  If you
want to display all entries, include the
.B \-a
option (which means 'all').  If you want to display the dates and times when
the entries were added and/or done, include the 
.B \-v
option (which means 'verbose').
The
.B \-p
option stands for postponed. It means that tasks which are 'deferred' or 'postponed' 
are shown as well as open tasks. 
.PP
By default, only entries having normal, high or urgent priority are shown.  To
change the minimum priority shown, specify the
.B min-priority
argument.  For example, 'tdll h' will only show entries with priority high or
urgent.
.PP
By default, the whole database is scanned.  If you only want to show part(s) of
the database, additional arguments can be given.  These are the indices of the
top node of each part of the database you want to show.  So if your database
contains entries with indices 1, 2, 2.1, 2.2, 2.2.1, 3 and 4, the command
.PP
tdl list \-a 2
.PP
will show all entries 2, 2.1, 2.2 and 2.2.1, whether or not they are completed.
.PP
Also by default, all entries in the database, at any depth, will be shown.  If
you only wish to show 'top-level' entries, for example, you can use
.PP
tdl list \-1
.PP
This lists level-1 entries.  Any level-1 entry with hidden child entries
underneath it will show a summary of how many such children there are.  For
example, the output
.PP
3 [2/7] A top level entry
.PP
means that the entry with index 3 has a total of 7 entries underneath it, of
which 2 are still open and 5 are completed (i.e. they've had 'tdl done' applied
to them.)
.PP
Because the single digit arguments are used this way for the 'list' subcommand,
the normal 'negative index' method can't be used to specify an entry a certain
distance from the end of the list.  If you want to do this, use a syntax like
.PP
tdl list \-\- \-1
.PP
to show the last index in the array, or
.PP
tdl list \-2 \-\- \-3 \-2 \-1
.PP
to show level-1 and level-2 entries within the last 3 level-1 entries in the
list.
.PP
Each 
.B search condition 
specifies a case-insensitive substring match that is applied to all parent 
indices further on in the arguments. (If no parent indices are given, all the 
search conditions are and'ed together and applied to filter all the nodes that 
would be shown according to the depth, priority etc arguments).
.PP
Each search condition takes one of the following forms
.PP
    /substring
    /substring/1
.PP
In each case, an entry will match if substring is actually a substring of the 
text of that entry. In the second form (where the number may be 0, 1, 2 or 3), 
a match occurs if there are up to that many errors in the substring. An error 
is a single character inserted, removed or changed.
.PP
This option is most useful if you have a large database and can remember you 
have an entry somewhere containing particular word(s), but can't remember where 
it is.
.PP
If you need regular expression matching, the best approach would be to run 
tdll from the shell and pipe the output to grep. The internal matching does 
approximate matches with keys up to 31 characters. 
.PP
By default, the listing is produced with colour highlighting.  The
.B \-m
option can be used to produce a monochrome listing instead.  Alternatively, the
.B TDL_LIST_MONOCHROME
enviroment variable can be set (to any value) to achieve the same effect.
.PP
The colours are assigned as follows:
.PP
.TS
tab(&);
l | l.
_
Colour & Meaning
_
Red & Urgent task
Yellow & High priority task
White & Normal priority task
Cyan & Low priority task, done task
Blue & Very low priority task
Green & Captions
_
.TE
.P
.ce 1
--ooOOoo--
.PP
.B tdl log
.br
.B tdlg
.PP
This command is used to add a new entry and mark it done immediately.  It is
most useful in conjunction with the
.B report
command, to record unexpected extra tasks you had to do.
.PP
The arguments for the
.B log
command are the same as those for the
.B add
command.
.P
.ce 1
--ooOOoo--
.PP
.B narrow
.I new_root_index
.br
.PP
The 
.B narrow 
command can be used to limit the effects of later commands to operate within 
a particular sub-tree of your database. Because the indices you specify for 
the later operations have the common prefix omitted, this can save typing if 
you have many changes to make within the same subtree.
.P
If your listings are in colour, the common prefix is coloured in blue whilst 
the paths below the root of the sub-tree are shown in the usual green. 
(In monochrome mode, there is no distinction.)
.P
Whilst your view is narrowed, the index of the sub-tree root is shown in square 
brackets between tdl and > (i.e. [2]).
.P
If you want to operate on the sub-tree root entry itself whilst you are 
narrowed, you can use . to specify its index (think: current directory in Unix.)
.P
To reverse the effects of the narrow command, use the 
.B widen 
command (see widen command).
.P
This command is only available when tdl is being run interactively, i.e. when 
you have a tdl prompt. It is not available directly from the shell (where it 
wouldn't make much sense). 
.P
.ce 1
--ooOOoo--
.PP
.B tdl open 
.I index_to_reopen[...] ...
.PP
The open command is used to reverse the effect of the 
.B postpone 
command. Its effect is actually to set the arrival time of the entries to the 
current time. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl postpone
.I index_to_postpone[...] ...
.PP
The postpone command is used to make 1 more more entries postponed. Its effect 
is actually to set the arrival time of the entries a long way in the future 
(i.e. it's an extreme form of the 'deferred' feature available through the add and 
defer commands.) Postponed entries can be re-activated with the 
.B open 
command. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl pri
.I new_priority
.I index_to_change ...
.PP
This command changes the priority of one or more entries.  The indices are in
the same format as those in the output of the
.B list
command.  The
.B new_priority
argument takes the same possible values as for the
.B add
command.
.P
.ce 1
--ooOOoo--
.PP
.B tdl purge
.I since_epoch
.I [entry_index...]
.PP
This command is used to remove old done entries from the database.  It is much more convenient than repeated
.B remove
commands.
.PP
The
.B since_epoch
argument specifies a time.  The format for this argument is described in the
.B "DATE SPECIFICATION"
section later. Entries that were marked done (using the
.B done
command) before that epoch will be purged.
.PP
Zero or more
.B entry_indices
may be given.  These restrict the purging to just those entries and their
descendents.  The default is to purge the entire database.
.P
.ce 1
--ooOOoo--
.PP
.B quit
.PP
The quit command is used to exit from tdl when it is used in interactive mode. 
The quit command is not available in the command line mode, where it would not 
make sense. 
.P
The quit command DOES NOT write any pending updates to the database before 
exiting. Compare the 
.B exit 
command, which does write all updates made during the current tdl run.
.P
The main use for the quit command would be to avoid damaging the database if a serious error had been made. 
.P
.ce 1
--ooOOoo--
.PP
.B tdl remove
.I index_to_remove ...
.br
.B tdl delete
.I index_to_remove ...
.PP
Completely remove one or more entries from the database.  The indices are the
same format as those shown in the output of the
.B done
command.
.PP
If the string "..." is appended to an index, it means that entry and all its
descendents.  This provides a quick way to remove a whole sub-tree of tasks.
.P
.ce 1
--ooOOoo--
.PP
.B tdl report
.I start_time
.I [end_time]
.PP
The
.B report
command produces a report (in bulleted list format) of tasks completed in a
certain time period.  This is useful if (for example) you have to write a
weekly summary of the work you've done.
.PP
The default for the end of the time period is the current time, if the
.B end_time
argument is not present.  The start of the period to report on must always be
specified.  The format for the time arguments is described in the
.B "DATE SPECIFICATION"
section later.
Examples :
.PP
tdl report 1w
.PP
will list all tasks completed in the previous week, whereas
.PP
tdl report 2w 1w
.PP
will list all tasks completed between 2 and 1 weeks ago.
.PP
Where a child entry has been completed in the reporting period, but its parent
has not been completed, the parent text in the report will be surrounded by
'[[' and ']]'.  To give one example, this will happen if the parent has other
child entries that haven't been completed yet.
.P
.ce 1
--ooOOoo--
.PP
.B revert
.PP
The revert command discards any changes made in the session and reloads the 
in-memory database from disc. If you have used the 
.B save 
command in the session, the database will revert to its state at the most 
recent save. Otherwise it will revert to its state when tdl was initially run.
.P
The revert command does not take any arguments. 
.P
.ce 1
--ooOOoo--
.PP
.B save
.PP
The 
.B save
command can be used to write the current in-memory database out to the disc 
database file. The behaviour is currently equivalent to the command exit 
followed by re-running tdl from the shell.

This command is useful if you tend to do long interactive tdl sessions. 
It guards against the risks of
.P
1. accidentally typing quit when you meant exit
.br
2. machine crashes
.br
3. running tdl in another window and seeing a stale copy of the database file. 
.P
The save command does not take any arguments.
.P
.ce 1
--ooOOoo--
.PP
.B tdl undo
.I index_of_entry_to_undo ...
.PP
This command cancels the effect of the
.B done
command for one or more entries, e.g. after they have been mistakenly marked as
done.
.PP
If the string "..." is appended to an index, it means that entry and all its
descendents.  This provides a quick way to re-open a whole sub-tree of tasks.
.P
.ce 1
--ooOOoo--
.PP
.B tdl usage
.PP
Same as
.B tdl help
(q.v.)
.P
.ce 1
--ooOOoo--
.PP
.B tdl version
.PP
Show the version number of the software.
.P
.ce 1
--ooOOoo--
.PP
.B tdl which
.PP
Show the filename of the database that tdl accesses in the current context.
.P
.ce 1
--ooOOoo--
.PP
.B widen
.I n_level
.PP
The optional n_levels parameter tells tdl how many levels to widen the view. 
If the parameter is not specified, it defaults to 1. If you try to widen more 
levels than the depth of the current sub-tree root node, the widening will be 
silently limited to its depth.
.P
This command is only available when tdl is being run interactively, i.e. when 
you have a tdl prompt. It is not available directly from the shell 
(where it wouldn't make much sense). 

.SH Completion facilities
.PP

When tdl has been compiled to use the readline library, the interactive mode 
supports a number of completion functions, activated with the <tab> key.
.P
In particular, the following are supported:

.B Command completion. 
If <tab> is pressed when the command line is empty, a list of possible commands 
will be shown. If <tab> is pressed when a partial command has been typed, the 
command will be completed immediately if possible, otherwise a list of commands 
matching the already-typed prefix will be shown.
.P
.B Help completion. 
If help or usage is already in the buffer, a list of commands will be shown 
(as above). The <tab> completion works in the same way to complete the name of 
the command you want a help summary for.
.P
.B Priority completion. 
If list or priority is at the start of the input buffer and the current word 
starts with a letter, tdl will try to complete the name of a priority level if 
<tab> is pressed.
.P
.B Open task completion. 
If done is at the start of the input buffer, hitting <tab> will show a list of 
task indices that are still open. If part of an index has already been typed, 
the open task indices for which the typed characters are a prefix will be shown.
.P
.B Postpone completion. 
If postpone is at the start of the input buffer, hitting <tab> will show a list 
of tasks that may be postponed. Tasks marked done are excluded. If open is at 
the start of the input buffer, hitting <tab> will show a list of tasks that may 
be opened.
.P
.B Parameter hints. 
If some other command is at the start of the input buffer and <tab> is pressed, 
tdl will show a one-line summary of that command's parameters. 

.SH DATE SPECIFICATIONS
.PP
The commands
.BR add ,
.BR done ,
.BR purge ,
.BR report ,
take arguments defining dates (with add and done it is optional).  Dates may be
specified in several formats, shown by the following examples:
.PP
.TS
tab(&);
l l.
\-1h & exactly 1 hour ago
\-2d & exactly 2 days ago
+1w & exactly 1 week in the future
+1m & exactly 1 month (30 days) in the future
+2y & exactly 2 years in the future
\-1d\-0815 & 08:15am yesterday
+1d\-08 & 8am tomorrow
+1w\-08 & 8am on the same day as today next week
+6h\-08 & 8am on the day containing the time 6 hours ahead of now
\.\-08 & 8am today
\.\-20 & 8pm today
20011020 & absolute : 12 noon on 20th October 2001
011020 & absolute : 12 noon on 20th October 2001 (current century)
1020 & absolute : 12 noon on 20th October 2001 (current century and year)
20 & absolute : 12 noon on 20th October 2001 (current century, year and month)
20011020\-081500 & absolute : 08:15am on 20th October 2001
20011020\-0815 & absolute : 08:15am on 20th October 2001 (seconds=0)
20011020\-08 & absolute : 08:00am on 20th October 2001 (minutes=seconds=0)
011020\-08 & absolute : 08:00am on 20th October 2001 (minutes=seconds=0, current century)
etc & (see below)
\-sun & 12 noon on the previous Sunday
+sat & 12 noon on the following Saturday
+sat\-08 & 8am on the following Saturday
\-tue\-0815 & 08:15am on the previous Tuesday
etc & (see below)
.TE
.PP
In the 'all-numeric' format, the rule is that dates can have fields omitted
from the start (assumed to be the current value), and times can have fields
omitted from the end (assumed to be zero, except if the hours figure is missing
it is assumed to be 12, since most work is done in the day.)
.PP
In the 'weekday and time' format, the time rule is the same: missing minutes
and seconds are taken as zero and missing hours as 12.  If the weekday is the
same as today, the offset is always 7 days in the required direction.  If the
weekday is not the same as today, the offset will always be less than 7 days in
the required direction.
.PP
In the 'relative' format, when a time is included as well, the procedure is as
follows.  First the time is determined which is the given number of hours, days
etc away from the current time.  Then the specified time on that day is used.
The main use for this is to specify times like '8am yesterday'.  Obviously some
of the more uses of this mode are rather far-fetched.
.PP
For the weekday and relative formats, the sign is actually optional.  The
default sign (implying past (-) or future (+)) will then be assumed depending on
the command as shown below:

.PP
.TS
tab(&);
l l l.
Command & Default & Reason
_
add & + & Add entries with deferred start times
done & - & Entries have been completed at some time in the past
report & - & Reporting on earlier completed tasks not future ones
purge & - & Tasks won't be completed in the future, so no need to purge future ones
.TE

.SH HOMEPAGE
.PP
The homepage for
.B tdl
on the internet is http://www.rc0.org.uk/tdl/
.SH AUTHOR
.PP
The author is Richard P. Curnow <rc@rc0.org.uk>.
.SH ACKNOWLEDGEMENTS
.PP
I got the idea from a program called devtodo.  I liked what that program did
and the command line approach to using it, but I ran into lots of compilation
problems with it on older C++ installations.  The path of least resistance
turned out to be to hack up a C program to do a similar job.

.SH ENVIRONMENT
.TP
TDL_DATABASE
If this variable is set, it defines the name of the file to use for holding the
database of tasks.  If the variable is not set, the search approach described
in the FILES section is used.
.TP
TDL_LIST_MONOCHROME
If this variable is set, the output from the
.B list
command is produced in monochrome instead of colour (the default).
.SH FILES
.TP
 ./.tdldb, ../.tdldb, ../../.tdldb, ...
If the TDL_DATABASE environment variable is not present, the file .tdldb in the
current directory is used, if that is present.  If not, the same file in the
parent directory is used, and so on, until the root directory of the filesystem
is reached.  If the database is still not found, a new one will be created in
the current directory (except for options that don't modify the database, such
as list, help and version.)
.PP
If you want to have a .tdldb file in 
.I every
directory, the suggested approach is to set the TDL_DATABASE environment variable to "./.tdldb".  So in a Bourne-like shell (sh, bash, zsh, ksh etc), you'd write
.IP
TDL_DATABASE=./.tdldb
.br
export TDL_DATABASE
.PP
and in a C-like shell (csh, tcsh etc) you'd write
.IP
setenv TDL_DATABASE ./.tdldb
.PP
If you want to share .tdldb files between directory hierarchies in some non-standard way, the suggested approach is to use symbolic links to do this, for example:
.IP
cd project1
.br
ln \-s ../project2/.tdldb .

.SH BUGS
Please report them to the author.

.SH SEE ALSO
The full documentation for tdl is maintained as a Texinfo manual. If the info and tdl
programs are properly installed at your site, the command
.IP
info tdl
.PP
should give you access to the complete manual.