I have a tcl script drakon_gen.tcl . I am running it, from another script run.tcl like this:
source "d:\\del 3\\drakon_editor1.22\\drakon_gen.tcl"
When I run run.tcl I have following output:
This utility generates code from a .drn file.
Usage: tclsh8.5 drakon_gen.tcl <options>
Options:
-in <filename> The input filename.
-out <dir> The output directory. Optional.
Now I need to add to run.tcl options that are in the output. I tried many ways but I receive errors. What is the right way to add options?
When you source a script into a tcl interpreter, you are evaluating the script file in the context of the current interpreter. If it was written to be a standalone program you may run into problems with conflicting variables and procedures in the global namespace. One way to avoid that is to investigate the use of slave interpreters (see the interp command) to provide a separate environment for the child script.
In your specific example it looks like you just need to provide some command line arguments. These are normally provided by the argv variable which holds a list of all the command line arguments. If you define this list before sourcing the script you can feed it the required command line. eg:
set original_argv $argv
set argv [list "--optionname" "value"]
source $additional_script_filename
set argv $original_argv
Related
I have a huge VCD file that I use in combination with gtkwave to observe certain signal behaviors. I have a list of signals stored into a .txt file which are the ones that I wish to probe. The thing is that by doing the insertion of the signals manually by hand is a painstakingly long process. So my question here is,
Is there a way, given the .txt file to compose a .tcl script that filters and adds the designated signals from the list to the waveform editor?
Well, after scouting on manuals and some gists I found here and there seems that there is a load of gtkwave instructions one can use that are listed (most of them) on the gtkwave manual (Appendix E) here. So in a nutshell all one has to do is to write a .tcl script in the following format:
# add_waves.tcl
set sig_list [list sig_name_a, register_name\[32:0\], ... ] # note the escaping of the [,] brackets
gtkwave::addSignalsFromList $sig_list
and then invoke the gktwave as:
gtkwave VCD_file.vcd --script=add_waves.tcl
Furthermore, access to the GUI menu options are viable as well via the following syntax in tcl:
gtkwave::/Edit/<Option> <value>
Is there a way to define an initialization procedure that's automatically called when a Tcl package is loaded?
In this case, I need to parse a configuration file and set a namespace variable.
I originally had the code in the namespace, outside of a proc, but pkg_mkIndex tried to execute the code when it sourced the file and tossed an error "while sourcing". The package file sources just fine from tclsh, and I'm not sure why it wouldn't do so within pkg_mkIndex.
I can comment out the init routine for pkg_mkIndex's sake, if that's the proper way to do this, but I wondered if there's a built-in way to have init procedures executed automatically, a la C's main().
but I wondered if there's a built-in way to have init procedures
executed automatically
It is common practise to provide an initialisation script as part of your package ifneeded script, e.g.:
package ifneeded mypkg 1.0.0 "source [list [file join $dir mypkg.tcl]]; source [list [file join $dir myinit.tcl]]"
Using pkg_mkIndex turns out not particularly helpful in anything non-trivial, as it attempts to (partially) evaluate the source files with all their dependencies. Better handicraft the pkgIndex.tcl script and separate the concerns (pkg definition, pkg initialisation; see above).
As far as I know, the source command only accepts the name of the script. Is there any workaround to source a script with any number of arguments?
set argv [list your parameters go here]
source myscript.tcl
in the command line i m giving input as
filename option
here option starting with hyphen.
how to pass command line arguments starts with -
The list of all the arguments passed to the process hosting your Tcl interpreter can be accessed using the global variable argv, which you can iterate over and inspect.
Special packages implementing ready-made solutions for "declarative" parsing of command-line arguments exist, with cmdline being one example. Also search the wiki for alternatives.
I think, you need the cmdline package from tcllib.
Documentation is here
http://tcllib.sourceforge.net/doc/cmdline.html
Joachim
I am having a little problem understanding the following command:
package ifneeded HelloWorld 1.0 [list source [file join $dir helloworld.tcl]]
in the pkgIndex.tcl,
I understand that when the pkgIndex.tcl is sourced and for example, we package require HelloWorld 1.0 , the helloworld.tcl will be sourced. I dont understand the list command...
The package ifneeded command is used to register (or query) how to make a package actually become present in a Tcl interpreter. This is done by evaluating a script, which is the argument generated with list in your example. Let's deconstruct it.
package ifneeded HelloWorld 1.0 [list source [file join $dir helloworld.tcl]]
---------------- ========== --- =============================================
command name package ver how to make it present,
name result of [list ...]
So far, so good. Now, a little aside: the list command is not just used for making lists, but it also makes guaranteed-substitution-free commands. That is, its result is a scrip that consists of an invocation of the command with its arguments, exactly as they were when they went into the list command.
This means that we're producing a script that is source somefilename, where somefilename is the result of the file join. In other words, you're getting almost the same thing as:
package ifneeded HelloWorld 1.0 "source $dir/helloworld.tcl"
Except that there is no assumption that the filename separator is / (that's formally a feature of the OS, not of Tcl, and file join knows about the difference) and it is safe if $dir happens to contain a space or other metacharacters (rather more common than you might hope).
What is $dir? Well, it's a special feature of pkgIndex.tcl scripts that they are (normally) evaluated in a context that sets the dir variable to the absolute name of the directory that contains the pkgIndex.tcl script. (You mustn't make assumptions about the current directory at this point; that belongs to the user of the main Tcl program, not to the package author.) This makes it enormously easier to relocate a package, as you can place all its component files relative to the one script and just move the whole lot in one chunk.
The package ifneeded command expects the following inputs:
package ifneeded package version ?script?
You can see that in your case, the package is HelloWorld, and the version is 1.0. Finally, the script is [list source [file join $dir helloworld.tcl]]. The reason list is used is that the script parameter expects a list.
The package ifneeded command expects a script as its last argument. A script is expected (in a common sense) to be well-formed, that is, to be parsable by the Tcl parser.
In this case of a rather standard pkgIndex.tcl, the thing to ensure is: no matter what the "dir" variable contains at the time the code from that pkgIndex.tcl is processed, the script should be constructed in such a way, that later the Tcl parser sees in it the source command with exactly one argument — no matter if $dir expanded to contain whitespace or funky characters like { etc.
Enter the list command. Here, it's used to construct a list of two elements: the string "source" and a string containing a file name (to serve as the sole argument to that source command). Now, when that list is interpreted as a script (a string), Tcl ensures that string representation contains all the needed quoting to remove any ambiguity about whitespace etc.
This ensures when the parser later interprets our constructed script, the source command in it will receive exactly one argument.
You can read much more of better written information on using list to prevent quoting issues here.