June 2016 - Oberon - mailman3.inf.ethz.ch

On praise of repeat-until construct
by Srinivas Nayak 25 Jun '16

25 Jun '16

Dear All, While I read Oberon compiler code, it feels so good to see repeat-until constructs. Its semantics matches to intuition; "do something till this happens". Where as do-while construct of C feels so odd now! With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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On Module in ORP.Mod.txt
by Srinivas Nayak 24 Jun '16

24 Jun '16

We see PROCEDURE Module; ... IF sym = ORS.times THEN version := 0; Texts.Write(W, "*"); ORS.Get(sym) ELSE version := 1 END ; Can we have a * mark like this: MODULE* Srinivas; What does it mean then? There, we also find ... IF (ORS.errcnt = 0) & (version # 0) THEN ORB.Export(modid, newSF, key); IF newSF THEN Texts.WriteString(W, " new symbol file") END END ; ... That means, if we see MODULE* before Srinivas, we can't export things! I think there is something called version 0 and version 1. What is the idea behind these two versions? With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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N-O: PartitionToFile ?
by eas lab 24 Jun '16

24 Jun '16

Dating back several years, I've got a partition, containing 12 *.Bak files, for each one of my 12 N-O:partitions of those days. Obviously, and I remember, that each *.Bak contains the *COMPRESSED* partition of files. Accessing N-O partitions without losing my other work, needs LNO, but I can't find the M.P that would have compressed the N-O:partition's files; so that I could know how to uncompress them, and give them their own Linux: Dir, now that disk-space has become plentiful, compared. to the 90s. Please advise. ?While writing this: I get images of:. list partition files + RX:delete *.Bak + Compress DirList to IDBak + copy IDBak to ArchivePartition .. And then there was some problem about the various compression formats, and some patent problem about 'zip'? == Chris Glur.

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ReadInt vs ReadNum
by Srinivas Nayak 22 Jun '16

22 Jun '16

Dear All, What is the difference between Files.ReadInt and Files.ReadNum? Where to use which one? With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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I have been defeated.
by eas lab 21 Jun '16

21 Jun '16

ETHO's beloved ViewerFrameTree [copied to LNO & LEO] only allows me to handle a few TextFrames, before I get confused, by Growing any viewer, which covers forgotten ones. With about 75 lines for the screen-height, it's not realistic to expect more than 3 or 4 to be viewed together and worked on. Projects that need 12 viewers to be accessible, need a method to prevent multiple copies with different contents. How about LinuxAos? == Chris Glur.

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Is LinuxAos only for Debian?
by eas lab 20 Jun '16

20 Jun '16

-> Lz ==... 45718629 : LinuxAos.tgz ? seek install.UnixAos in LinuxAos.tgz ==nx -> which install == /usr/bin/install --> install --help == copies files (often just compiled) into destination... -> chmod +x install.UnixAos == chmod: cannot access `install.UnixAos': No such file or directory =?=> see Debian -> chroot /mnt/h17 man install. -> chmod +x install.LinuxAos.tgz ==cannot access `install.LinuxAos.tgz' ==> unpack via mc & copy 4Dirs + 3files to: /home/Sftware/LinuxAos/ lrwxrwxrwx 1 root root 16 2016-06-20 18:13 aos.linux -> aos.linux.debian -rwxr-xr-x 1 1935 111 18584 2014-05-27 06:57 aos.linux.debian -rwxr-xr-x 1 1935 111 18708 2013-10-28 09:42 aos.linux.dist <- ==dyn-linked -?-> ./aos.linux.dist == LinuxAosCore not found <- in ./obj => cp aos.linux.dist => ./obj -> ./aos.linux.dist == <- writes: AOS.27202.Log. LinuxAos (rev.6661): Kernel: Initialized and started. UnixFiles.Initialize: environment variable AOSPATH not defined ? Try : Start.sh == --------------------------------- AOSPATH=/home/Sftware/LinuxAos/obj #AOSPATH="/home/Sftware/LinuxAos/system" export AOSPATH exec ./aos.linux.dist ------------------------------------------------------ ==Starts with FullScreen & mouse pointer & writes log: ==... Default font installedWindowManager.FontManager subsection missing in Configurat ion. Running on defaults Using embedded font WindowManager.FontManager subsection missing in Configuration.. Running on defaults WindowManager: 24-bit color No decoder found for PNG <-- ?? Picture not loaded : ZeroSkin.zip://arrow.png No decoder found for PNG !!! => ./system contains: WMInstaller.tar + *.tar => tar -tvf archive.tar # List all files in archive.tar verbosely. -> tar -tvf WMInstaller.tar == ... -> tar -xf WMInstaller.tar == 8x *Text + OberonLogoSmall.png ?? NB -> ls -l .aoshome == lrwxrwxrwx 1 root root 11 2016-06-20 18:12 .aoshome -> /opt/fld/a2 Try: cd /home/Sftware/LinuxAos ln -s /home/Sftware/LinuxAos .aoshome == SAME => log ==... No decoder found for PNG WindowManager: Display resolution: 1008x736x24 DisplayRefresher installed. WindowManager: Window manager closed {P cpuid= 0, pid= 3 Files: 43 open files} Objects 20 discarded finalizers, 0 pending finalizers UnixFiles 43 discarded finalizers, 0 pending finalizers

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Regarding PROCEDURE Import
by Srinivas Nayak 19 Jun '16

19 Jun '16

Dear Friends, In ORB.Mod.txt we see PROCEDURE Import*(VAR modid, modid1: ORS.Ident); ... ... IF F # NIL THEN Files.Set(R, F, 0); Files.ReadInt(R, key); Files.ReadInt(R, key); Files.ReadString(R, modname); ... ... Is ReadInt twice correct? With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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minor tuning of TUI?
by eas lab 19 Jun '16

19 Jun '16

I'm trying to re-find the URL of the very competent 'human- computer-interface' designer, which was [I believe] *.ch ? Reports have shown why users don't appreciate ETHO and acme/sam/wily. ETHO would be easily tuneable to remove some objections. The first has already been done by acme/sam/wily [plan 9's copy of ETHO]. If you've got 4 TextFrames open and you want to do some complex operation on one of then, then you'd Grow that one to full UserFrame size; and likely 'branch-off' on some task which might need a Frame which is now covered, or you may need some as yet unOpened Frame. After completing that complex operation you SHOULD have forgotten that you covered 3 Frames. If you DO remember that, you shouldn't be using a computer, since you aren't working at the limit of your memory! wily, of which I normally have more instances running than LinuxETHO, solves the problem: it moves the hidden Frame to the foreground, when the Frame is 'called'. ETHO can give bad results, if you hadn't saved the hidden Frame-A before you "just temporarily?" Grew Frame-E to full Track; and then made changes to the newly re-fetched old Frame-A. Can't ETHO just scan the Frame tree, before loading a Frame from file, and if the Frame is already open, then move it to foreground. wily also puts the cursor to the just loaded Frame. Although we lose the ability to get both the filed version and the loded/open but not yet Stored version, a new command could exist to handle this rare requirement. Critics, emphasise the time needed to move the hand between keybrd and mouse. Since the most common need for such movement, is after a text section is typed, and it is saved. Would it be difficult to have a hot-key [I favor F2] to: <Store the Frame which received the latest keybrd input>? == Chris Glur. PS. wily has problems too.

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Understanding ORS.Mod.txt
by Srinivas Nayak 13 Jun '16

13 Jun '16

Dear Friends, Finally I could gather my courage to read NW's compiler implementation. Hope to get your help when I get doubts. In ORS.Mod.txt we see PROCEDURE Mark*(msg: ARRAY OF CHAR); VAR p: LONGINT; BEGIN p := Pos(); IF (p > errpos) & (errcnt < 25) THEN Texts.WriteLn(W); Texts.WriteString(W, " pos "); Texts.WriteInt(W, p, 1); Texts.Write(W, " "); Texts.WriteString(W, msg); Texts.Append(Oberon.Log, W.buf) END ; INC(errcnt); errpos := p + 4 END Mark; Why we did, errpos := p + 4 ? How do I understand/interpret this? I was thinking, it should be errpos := p + 1 ... Kindly correct me. With thanks and best regards, Yours sincerely, Srinivas Nayak Home: http://www.mathmeth.com/sn/ Blog: http://srinivas-nayak.blogspot.in/

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