119 lines
4.6 KiB
Groff
119 lines
4.6 KiB
Groff
Version 0.6 (2012-04-08)
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* Add support for user-defined cdmrc:
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Since cdm(1) is run with user priviledge, users can still circumvent
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administrator's settings by simply running a modified version of cdm(1)
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and use his own config. Therefore it's technically meaningless to specify
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everything in a config file located in /etc/.
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Multilevel config can be more flexible (see the implementation of submenus
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after Casper's modifications), just like with bash(1), zsh(1), etc.
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* Classify menu items into console programs and X programs:
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Console programs are directly `exec'ed. X programs are run in a way
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similar to that in cdm 0.5.3. Programs are specified in the bash array
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`$binlist', and their names are in the array `$namelist'. Their types (
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aka "flags"), as denoted by `C' (console programs) or `X' (X programs),
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are specified in the array `$flaglist'.
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So with the current architecture, cdm(1) submenus can be implemented by
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letting one cdm(1) `exec' another cdm(1) with a different config file (see
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the "user-defined cdmrc" section).
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Also, one can log in his account and autostart cdm(1) (using `exec cdm' in
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.profile or so), and let cdm(1) launch his desktop, or just drop to his
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$SHELL by `exec $SHELL'. So the architecture is more flexible than cdm
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0.5.3.
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Right way to *auto*start cdm(1) -- use `exec cdm':
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login(1) -/spawn/-> $SHELL -/exec/-> cdm(1) -/exec/-> console program
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login(1) -/spawn/-> $SHELL -/exec/-> cdm(1) -> /exit/
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| ^
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/spawn/ /return/
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v |
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cdm-xlaunch(1)
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/Launch and put to background/
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v
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X program
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Wrong way to *auto*start cdm(1) -- just run (spawn) `cdm':
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login(1) -/spawn/-> $SHELL /So the shell does not exit (note 1)/
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| ^
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/spawn/ /return/
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v |
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cdm(1) -/run console program or X program/
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Note 1: Cannot configur $SHELL to exit conditionally on the exit of
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cdm(1), because cdm might `exec' to arbitrary program as
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specified by the user, of which the return values' meanings
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could not be predicted.
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It is also not advisable to let cdm(1) to wait for the running
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program to exit (instead of `exec' the program or use the
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method in cdm-xlaunch(1) to put the program to background),
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since that just adds a (mostly) useless sleeping cdm(1) on the
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process table when the program is running.
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* Change `$menu' to a bash array:
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This makes escaping and quoting in the menu possible and elegant for both
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cdm(1) and cdmrc, which adds possibility for providing arguments to
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programs in `$binlist' (formerly known as `$wmbinlist').
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`$usexinit' and related code is removed accordingly.
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* Use a better way to safely launch a program in the background:
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See <http://linuxshellaccount.blogspot.com/2007/12/
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what-to-do-when-nohup-hangs-up-anyway.html>.
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`$loginshell' is removed accordingly.
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* Remove `$allowconsole', `shutdownmenu()', etc.:
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Since the related things can be set in config files as "console programs",
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`$binlist' supports commands with whitespaces, and submenus can be
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elegantly implemented with cdm `exec'ing another cdm with a different
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config file.
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* Code separation:
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Code messing with X would only be run if an X program is to be run.
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`xstart()' code is moved to `cdm-xlaunch(1)', since it's relatively
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independent code and thus would be sometimes useful for running as a
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standalone program.
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* Replace self-made info formatting code with `functions.sh':
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checkyesno() is removed too since gentoo's `functions.sh' already provides
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it.
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`functions.sh' can be substituted with custom ones of course.
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* Use signal names (not numbers) in `trap'.
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* Changes to variable names:
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The changed are generally intended to make it easier to reason about the
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actually effects of the variables.
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`$theme' -> `$dialogrc': bacause the "theme" file is essentially a
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dialogrc file. This is mainly affected by the Arch philosophy: "simplicity
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as without unnecessary additions, modifications, or complications".
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BTW, `$dialogrc' should now be set to an absolute path, making it possible
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to make use of dialogrc's in the whole file system.
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`$cosolekittime' -> `$cktimeout': indicate "timeout" here.
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* Reformat comments:
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Expanded tabs to avoid problem with editors.
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