fileutil::multi::op - Multi-file operation, scatter/gather
package require Tcl 8.4
package require fileutil::multi::op ?0.5.3?
package require wip ?1.0?
::fileutil::multi::op ?opName? ?word...?
opName option ?arg arg ...?
$opName do ?word...?
into directory
in directory
to directory
from directory
not pattern
for pattern
exclude pattern
but
except
as name
recursive
recursively
copy
move
remove
expand
invoke cmdprefix
reset
(
)
cd directory
up
for-windows
for-win
for-unix
the pattern
the-set varname
-> varname
strict
!strict
files
links
directories
dirs
all
state?
as?
excluded?
from?
into?
operation?
recursive?
strict?
type?
This package provides objects which are able to perform actions on
multiple files selected by glob patterns.
At the core is a domain specific language allowing the easy
specification of multi-file copy and/or move and/or deletion operations.
Alternate names would be scatter/gather processor, or maybe even
assembler.
The main command of the package is:
- ::fileutil::multi::op ?opName? ?word...?
- The command creates a new multi-file operation object with an associated
global Tcl command whose name is opName. This command can be used
to invoke the various possible file operations. It has the following
general form:
If the string %AUTO% is used as the opName then the
package will generate a unique name on its own.
If one or more words are specified they are interpreted as
an initial set of file commands to execute. I.e. the method do of the
newly constructed object is implicitly invoked using the words as its
arguments.
The following methods are possible for multi-file operation
objects:
- $opName do ?word...?
- This method interprets the specified words as file commands to execute.
See the section FILE API for the set of acceptable commands, their
syntax, and semantics.
The result of the method is the result generated by the last
file command it executed.
Both object constructor and method do take a list of words
and interpret them as file commands to execute. The names were chosen to
allow the construction of operations as sentences in near-natural language.
Most of the commands influence just the state of the object, i.e. are simply
providing the configuration used by the command triggering the actual
action.
- into
directory
- Specifies the destination directory for operations.
- in
directory
- Alias for into.
- to
directory
- Alias for into.
- from
directory
- Specifies the source directory for operations.
- not
pattern
- Specifies a glob pattern for paths to be excluded from the operation.
- for
pattern
- Alias for not.
- exclude
pattern
- Alias for not.
- but
- Has no arguments of its own, but looks ahead in the list of words and
executes all not commands immediately following it. This allows the
construction of "but not" and "but exclude" clauses
for a more natural sounding specification of excluded paths.
- except
- A semi-alias for but. Has no arguments of its own, but looks ahead
in the list of words and executes all for commands immediately
following it. This allows the construction of "except for"
clauses for a more natural sounding specification of excluded paths.
- as name
- Specifies a new name for the first file handled by the current operation.
I.e. for the renaming of a single file during the operation.
- recursive
- Signals that file expansion should happen in the whole directory hierarchy
and not just the directory itself.
- recursively
- An alias for recursive.
- copy
- Signals that the operation is the copying of files from source to
destination directory per the specified inclusion and exclusion
patterns.
- move
- Signals that the operation is the moving of files from source to
destination directory per the specified inclusion and exclusion
patterns.
- remove
- Signals that the operation is the removal of files in the destination
directory per the specified inclusion and exclusion patterns.
- expand
- Signals that there is no operation but the calculation of the set of files
from the include and exclude patterns. This operation is not available if
the-set is used.
- invoke
cmdprefix
- Signals that the user-specified command prefix cmdprefix is the
operation to perform. The command prefix is executed at the global level
and given the source directory, destination directory, and set of files
(as dictionary mapping from source to destination files), in this
order.
- reset
- Forces the object into the ground state where all parts of the
configuration have default values.
- (
- Saves a copy of the current object state on a stack.
- )
- Takes the state at the top of the state stack and restores it, i.e. makes
it the new current object state.
- cd
directory
- Changes the destination directory to the sub-directory directory of
the current destination.
- up
- Changes the destination directory to the parent directory of the current
destination.
- for-windows
- Checks that Windows is the current platform. Aborts processing if
not.
- for-win
- An alias for for-windows.
- for-unix
- Checks that Unix is the current platform. Aborts processing if not.
- the
pattern
- This command specifies the files to operate on per a glob pattern, and is
also the active element, i.e. the command which actually performs the
specified operation. All the other commands only modified the object state
to set the operation up, but di nothing else.
To allow for a more natural sounding syntax this command also
looks ahead in the list of words looks and executes several commands
immediately following it before performing its own actions. These
commands are as, but, exclude, except,
from, and into (and aliases). That way these commands act
like qualifiers, and still take effect as if they had been written
before this command.
After the operation has been performed the object state the
exclude patterns and the alias name, if specified, are reset to their
default values (i.e. empty), but nothing else.
- the-set
varname
- Like the, however the set of files to use is not specified
implicitly per a glob pattern, but contained and loaded from the specified
variable. The operation expand is not available if this command is
used.
- -> varname
- Saves the set of files from the last expansion into the specified
variable.
- strict
- Make file expansion and definition of destination directory (in and
aliases) strict, i.e. report errors for missing directories, and empty
expansion.
- !strict
- Complement of strict. A missing destination directory or empty
expansion are not reported as errors.
- files
- Limit the search to files. Default is to accept every type of path.
- links
- Limit the search to symbolic links. Default is to accept every type of
path.
- directories
- Limit the search to directories. Default is to accept every type of
path.
- dirs
- An alias for directories.
- all
- Accept all types of paths (default).
- state?
- Returns the current state of the object as dictionary. The dictionary keys
and their meanings are:
- as
- Last setting made by as.
- excluded
- List of currently known exclusion patterns.
- from
- Current source directory, set by from.
- into
- Current destination directory, set by into (and aliases).
- operation
- Current operation to perform, set by copy, move,
remove, expand, or invoke.
- recursive
- Current recursion status. Set/unset by recursive and
!recursive.
- strict
- Current strictness. Set/unset by strict and !strict.
- type
- Current path type limiter. Set by either files, directories,
links, or all.
- as?
- Returns the current alias name.
- excluded?
- Returns the current set of exclusion patterns.
- from?
- Returns the current source directory.
- into?
- Returns the current destination directory.
- operation?
- Returns the current operation to perform.
- recursive?
- Returns the current recursion status.
- strict?
- Returns the current strictness.
- type?
- Returns the current path type limiter.
The following examples assume that the variable F contains
a reference to a multi-file operation object.
$F do copy \\
the *.dll \\
from c:/TDK/PrivateOpenSSL/bin \\
to [installdir_of tls]
$F do move \\
the * \\
from /sources \\
into /scratch \\
but not *.html
# Alternatively use 'except for *.html'.
$F do \\
move \\
the index \\
from /sources \\
into /scratch \\
as pkgIndex.tcl
$F do \\
remove \\
the *.txt \\
in /scratch
Note that the fact that most commands just modify the object state
allows us to use more off forms as specifications instead of just
nearly-natural language sentences. For example the second example in this
section can re-arranged into:
$F do \\
from /sources \\
into /scratch \\
but not *.html \\
move \\
the *
and the result is not only still a valid specification, but even
stays relatively readable.
Further note that the information collected by the commands
but, except, and as is automatically reset after the
associated the was executed. However no other state is reset in that
manner, allowing the user to avoid repetitions of unchanging information.
For example the second and third examples of this section can be merged and
rewritten into the equivalent:
$F do \\
move \\
the * \\
from /sources \\
into /scratch \\
but not *.html not index \\
the index \\
as pkgIndex.tcl
This document, and the package it describes, will undoubtedly
contain bugs and other problems. Please report such in the category
fileutil of the Tcllib SF Trackers
[http://sourceforge.net/tracker/?group_id=12883]. Please also report any
ideas for enhancements you may have for either package and/or
documentation.
copy, file utilities, move, multi-file, remove