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Tab reaches the disk

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Paths and programs, which is the half that makes it worth having. The first word
of a line is a command or a PROGRAM, offered under the name somebody would type
- the extension taken off - and anything after it is a file, offered as it
really is. A separator anywhere in the word says which directory to look in.

A directory answers with a separator on the end instead of a space, which says
what it is and lets the next part be typed straight away. The answer ending in
one is also what stops a space being added, so that is one test rather than a
flag.

PROGRAMS ARE LOOKED FOR WHERE THE SHELL WOULD LOOK to run one: where you are,
/Apps on the disk you are on, and /Apps on drive 0. Offering something the shell
would not find would be finishing a word into a thing that then does not work.
Drive 0's is skipped when that is already the drive, or every program in it
would be offered twice and nothing would ever be the only match.

Walking somebody else's directory means standing in it, which is the only way to
walk one here, so where the person was and which drive they were on are put down
first and restored whatever happens.

Three bugs, all found by running it:

THE DIRECTORY TEST WAS INVERTED. dir asks the same question the same way round
four hundred lines further up, which is what made it obvious once looked at.

THE /Apps WALK OVERWROTE THE TYPED PATH. The whole search runs a second time to
list the matches, and by then TabDir said "/Apps" - so a word that had named
nowhere went looking in the wrong place and listed nothing at all. Two ways into
the walk now, and the typed path is never written over.

AND LISTING ONLY KNEW ABOUT COMMANDS, because it was a second copy of the walk.
It is the same walk with a flag now: finding the answer and showing the matches
are the same question asked twice.

Also cosmosMonitor, which had been RE-BLESSED INTO MEANINGLESSNESS by the wall
move. It disassembles a loaded program, at an address the input names - and that
address moved a page while the recording was simply re-recorded to whatever came
out, which was a page of zeroes. It is pointed at 5000 again.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E2JrLzFvuFX9fgi1LDRjrW
This commit is contained in:
Anachronaut
2026-09-01 18:10:40 -04:00
co-authored by Claude Opus 5
parent bb065fe221
commit 3c76934a9a
9 changed files with 551 additions and 132 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Programs/CosmOS/README.md
+24 -7
View File
@@ -315,14 +315,31 @@ should be on it, and the shell decides.
### Finishing A Word:
Tab finishes the **first** word of a line against the shell's own commands. One match goes in
with a space after it, because a word that can only be one thing is finished. Several are
folded into their longest common prefix and that goes in, which is the most that can be said
without guessing which was meant - and if that adds nothing, because what is typed is already
as far as they all agree, the matches are listed and the line put back underneath.
Tab finishes the word being typed. One match goes in with a space after it, because a word
that can only be one thing is finished. Several are folded into their longest common prefix
and that goes in, which is the most that can be said without guessing which was meant - and
if that adds nothing, because what is typed is already as far as they all agree, the matches
are listed and the line put back underneath.
Nothing typed and nothing matching both do nothing, quietly. Finishing an argument rather
than a command is not built yet.
**What it can be depends on where in the line it is.** The first word is a command or a
program; anything after it is a file.
| Where | What is offered |
| -- | -- |
| The first word | the fifteen commands, and programs - under the name you would type, with the extension taken off |
| After it | anything on the disk, under its real name |
| Either, with a `/` in it | whatever is in the directory the word names |
A directory answers with a separator on the end instead of a space, which says what it is and
lets the next part be typed straight away.
**Programs are looked for in the three places the shell would look to run one**: where you
are, `/Apps` on the disk you are on, and `/Apps` on drive 0. Offering something the shell
would not find would be finishing a word into a thing that then does not work. A program that
is in two of those places is offered twice and so is never the only match, which costs it the
space after it - the shell is comparing names, not deciding which file it would have run.
Nothing typed and nothing matching both do nothing, quietly.
**This is the same wall the history was behind.** A shell that never sees a keystroke has no
moment at which somebody has typed half a word - the terminal hands over finished lines - so
Programs/CosmOS/Source/cosmos.asm
+463 -84
View File
@@ -1538,7 +1538,7 @@ tabComplete:
tabBack:
SETD.1 TabWordAt
LDA.1
BRA tabIsFirst ; The start of the line is the start of the word, and of the line.
BRA tabAtLineStart ; The start of the line is the start of the word, and of the line.
DECA
CALL tabCharAt
MVQA
@@ -1551,10 +1551,19 @@ tabBack:
STA.1
BRI tabBack
tabAtLineStart:
INIA 0x01
SETD.1 TabFirst
STA.1
BRI tabIsFirst
tabFoundStart:
; There is a space behind the word, so something may be in front of that space. Only a run
; of spaces means this is still the first word; anything else is an argument, and finishing
; one of those is not built yet.
; of spaces means this is still the first word - and which word it is decides what the word
; could BE: a command or a program at the front of a line, a file anywhere after it.
INIA 0x01
SETD.1 TabFirst
STA.1
SETD.1 TabWordAt
LDA.1
SETD.1 TabLeft
@@ -1569,8 +1578,10 @@ tabFirstCheck:
MVQA
INIB 0x20
XOR
BNQ tabDone ; Not a space, so a word came before this one.
BRI tabFirstCheck
BRQ tabFirstCheck
RSTA
SETD.1 TabFirst
STA.1 ; A word came before this one, so this is an argument.
tabIsFirst:
; How much of it is typed. Nothing at all is not a question anybody asked - it would offer
@@ -1592,7 +1603,22 @@ tabIsFirst:
SETD.1 TabBestLen
STA.1
CALL tabTryNames
; A path in the word says which directory to look in, and narrows what is being matched to
; the part after the last separator.
CALL tabSplit
; ---- What this word could be ----
;
; The shell's own commands, only at the front of a line and only when no directory has been
; named: nothing with a separator in it was ever going to be "dir".
;
; And on the disk: programs at the front of a line, since that is all a first word can
; usefully be, and anything at all after it.
SETD.1 TabFirst
LDA.1
SETD.1 TabPrograms
STA.1
CALL tabRunSources
SETD.1 TabCount
LDA.1
@@ -1641,11 +1667,24 @@ tabPutDone:
XOR
BNQ tabAmbiguous
; Only one thing it can be, so it is finished and a space says so.
; Only one thing it can be, so it is finished and a space says so - unless it is a
; directory, which answered with a separator on the end and is somewhere to carry on typing
; rather than something to have finished.
SETD.3 TabBest
SETD.1 TabBestLen
LDA.1
DECA
DPUA.3
LDA.3
INIB 0x2F
XOR
BRQ tabSaidDirectory
INIA 0x20
SETD.1 EditChar
STA.1
CALL editPut
tabSaidDirectory:
CALL editRedraw
BRI tabDone
@@ -1663,6 +1702,20 @@ tabAmbiguous:
tabDone:
BRI editKey
; Everywhere a candidate can come from, in the order they are tried. Run once to find the
; answer and again to show the matches, which is why it is a routine and not a run of code.
tabRunSources:
SETD.1 TabFirst
LDA.1
BRA tabNoNames
SETD.1 TabDirLen
LDA.1
BNA tabNoNames
CALL tabTryNames
tabNoNames:
CALL tabTryFiles
RET
; A holds an offset into the line. Q is the character there.
tabCharAt:
SETD.1 EditBase
@@ -1725,6 +1778,15 @@ tabOfferMatch:
BRI tabOfferMatch
tabOfferTake:
; ---- Folded in, or shown ----
;
; The same walk answers both questions, because they are the same question asked twice:
; what matches. Listing used to be a second copy of the walk that knew only about the
; shell's own words, so the files it should have been showing were never there.
SETD.1 TabShowing
LDA.1
BNA tabOfferPrint
; The first match is the answer. Every one after it cuts the answer back to where the two
; stop agreeing, which is all that can be said without guessing which was meant.
SETD.1 TabCount
@@ -1738,6 +1800,15 @@ tabOfferTake:
BRI tabOfferSkip
tabOfferFirst:
CALL tabTake
BRI tabOfferSkip
tabOfferPrint:
SETD.1 TabStart
LDD.0.1
CALL printString
INIA 0x20
OUTA 0x00
OUTA 0x00 ; Two spaces between them, and A already holds one.
tabOfferSkip:
; Past the end of this candidate, from wherever the comparison stopped.
@@ -1813,6 +1884,355 @@ tabNarrowCut:
tabNarrowDone:
RET
; ---- Splitting the word at its last separator ----
;
; "Apps/Sn" is a directory to look in and a name to match, and everything downstream depends
; on getting that split right. What comes back is TabDir holding the directory part - empty
; when there is no separator, meaning where the machine already is - and TabWordAt and
; TabWordLen narrowed to the name part, so that matching and inserting go on working on the
; part of the word they were always about.
tabSplit:
RSTA
SETD.1 TabDirLen
STA.1
; Backwards, so the LAST separator is the one found.
SETD.1 TabWordLen
LDA.1
SETD.1 TabAt
STA.1
tabSplitBack:
SETD.1 TabAt
LDA.1
BRA tabSplitNone ; No separator anywhere in it.
DECA
STA.1
SETD.1 TabWordAt
LDB.1
CCF
ADD
MVQA
CALL tabCharAt
MVQA
INIB 0x2F
XOR
BNQ tabSplitBack
; Found one. The directory part is everything up to and including it, which is what makes
; "/Source/" and "Source/" both say what they mean.
SETD.1 TabAt
LDA.1
INCA
SETD.1 TabDirLen
STA.1
SETD.2 TabDir
RSTA
SETD.1 TabCopyAt
STA.1
tabSplitCopy:
SETD.1 TabCopyAt
LDA.1
SETD.1 TabDirLen
LDB.1
CCF
SUB
BNC tabSplitCopied
SETD.1 TabWordAt
LDA.1
SETD.1 TabCopyAt
LDB.1
CCF
ADD
MVQA
CALL tabCharAt
MVQA
STA.2
INCD.2
SETD.1 TabCopyAt
LDA.1
INCA
STA.1
BRI tabSplitCopy
tabSplitCopied:
RSTA
STA.2 ; The zero that ends it.
; And the word being matched is what comes after the separator.
SETD.1 TabWordAt
LDA.1
SETD.1 TabDirLen
LDB.1
CCF
ADD
MVQA
SETD.1 TabWordAt
STA.1
SETD.1 TabWordLen
LDA.1
SETD.1 TabDirLen
LDB.1
CCF
SUB
MVQA
SETD.1 TabWordLen
STA.1
RET
tabSplitNone:
SETD.0 TabDir
RSTA
STA.0
RET
; ---- What is on the disk ----
;
; Every entry of the directory the word names that begins with the rest of the word. A
; directory is offered with a separator after it, which says what it is and lets the next
; part be typed straight away - and, because the answer then ends in one, is also what stops
; a space being put after it.
;
; WHERE THE MACHINE IS COMES BACK. This walks somebody else's directory by standing in it,
; which is the only way to walk one here, so where they were and which drive they were on are
; put down first and restored whatever happens.
tabTryFiles:
SETD.0 DiskReady
LDA.0
BRA tabFilesNone
INA 0x24
SETD.1 TabWasDrive
STA.1
SETD.0 SbfsCwd
SETD.1 TabWasCwd
CALL sbfsCopyWord
CALL tabWalkNamed
; ---- And the places a program is looked for ----
;
; The first word of a line is a command or a program, and the shell looks for a program in
; three places: where you are, the system's own place for them on the disk you are on, and
; that same place on drive 0. Tab offers what the shell would find, or it would finish a
; word into something that then would not run.
;
; ONLY WHEN NO DIRECTORY WAS NAMED. "Apps/Sn" means that directory and nowhere else.
SETD.1 TabFirst
LDA.1
BRA tabFilesBack
SETD.1 TabDirLen
LDA.1
BNA tabFilesBack
CALL tabWalkApps
; And drive 0's, unless that is the drive we are already on - in which case it is the same
; directory, and offering everything in it twice would mean nothing was ever the only
; match.
SETD.1 TabWasDrive
LDA.1
BRA tabFilesBack
RSTA
CALL sbfsUse
CALL tabWalkApps
BRI tabFilesBack
; ---- Everything in a directory, offered ----
;
; Two ways in, because there are two kinds of place to look: the one the word named, and the
; system's own place for programs. THE FIRST MUST NOT BE OVERWRITTEN BY THE SECOND - an
; earlier version wrote "/Apps" into TabDir, and since the whole walk runs a second time to
; list the matches, that second run looked in /Apps for a word which had named nowhere, and
; showed nothing at all.
;
; Where the machine stands is moved and put back by the caller, which is what makes calling
; either of these more than once safe.
tabWalkApps:
SETD.0 TabWasCwd
SETD.1 SbfsCwd
CALL sbfsCopyWord
SETD.0 AppsPath
BRI tabWalkTo
tabWalkNamed:
SETD.0 TabWasCwd
SETD.1 SbfsCwd
CALL sbfsCopyWord
SETD.1 TabDirLen
LDA.1
BRA tabFilesHere ; No directory named, so it is this one.
SETD.0 TabDir
tabWalkTo:
CALL sbfsWalk
BNQ tabWalkNothing ; No such path, and nothing to offer out of it.
; The root is not an entry, so it has no flags to ask - and it is the one place that can be
; walked to without there being anything to have asked.
SETD.0 SbfsAt
LDA.0
INCD.0
LDB.0
OR
BRQ tabFilesGo
SETD.0 SbfsFoundFlags
LDA.0
INIB 0x02
AND
BRQ tabWalkNothing ; Not a directory, so there is nothing in it.
tabFilesGo:
SETD.0 SbfsAt
SETD.1 SbfsCwd
CALL sbfsCopyWord
tabFilesHere:
CALL sbfsFirst
BRI tabFilesCheck
tabFilesStep:
CALL sbfsNext
tabFilesCheck:
BNQ tabWalkNothing
CALL tabEntry
BRI tabFilesStep
tabWalkNothing:
RET
tabFilesBack:
SETD.0 TabWasCwd
SETD.1 SbfsCwd
CALL sbfsCopyWord
SETD.1 TabWasDrive
LDA.1
CALL sbfsUse
tabFilesNone:
RET
; The entry the walk is standing on, offered under the name somebody would type for it.
tabEntry:
SETD.0 SbfsName
SETD.1 TabCandidate
CALL tabCopyName
SETD.0 SbfsFoundFlags
LDA.0
INIB 0x02
AND
BRQ tabEntryFile ; The bit SET is what says directory - see dir, which asks the
; same question the same way round.
; A directory, and the separator goes on the end of it.
SETD.3 TabCandidate
CALL tabEnd
INIA 0x2F
STA.3
INCD.3
RSTA
STA.3
BRI tabEntryOffer
tabEntryFile:
; A file. When the first word of a line is being finished it can only usefully be a
; program, and the name to type for one is the name without its extension - so anything
; else is not offered at all rather than offered and useless.
SETD.1 TabPrograms
LDA.1
BRA tabEntryOffer
CALL tabStripSbx
BNQ tabEntryDone
tabEntryOffer:
SETD.3 TabCandidate
CALL tabOffer
tabEntryDone:
RET
; DP0 names a string and DP1 where to put it. Copies up to what a name can be.
tabCopyName:
RSTB
tabCopyNext:
LDA.0
BRA tabCopyDone
STA.1
INCD.0
INCD.1
INCB
INIA 0d40
CCF
SUB
BRQ tabCopyDone
BRI tabCopyNext
tabCopyDone:
RSTA
STA.1
RET
; DP3 names a string. Leaves DP3 on its zero.
tabEnd:
LDA.3
BRA tabEndDone
INCD.3
BRI tabEnd
tabEndDone:
RET
; Takes ".sbx" off the end of TabCandidate. Q is zero if it was there, and one if it was not
; - which is how a file that is not a program is passed over.
tabStripSbx:
; How long the name is, counted rather than measured from a pointer, because what is
; wanted next is a NUMBER: four characters back from the end is only a place if there are
; four of them to go back over.
SETD.0 TabCandidate
RSTB
tabStripCount:
LDA.0
BRA tabStripCounted
INCD.0
INCB
BRI tabStripCount
tabStripCounted:
; The count is in B and wanted in A, and there is no instruction that moves one to the
; other: adding it to nothing is how a value crosses from B to A on this machine.
RSTA
CCF
ADD
MVQA
INIB 0d4
CCF
SUB
BRC tabStripNo ; Shorter than the extension, so it cannot end in it.
MVQA
SETD.3 TabCandidate
DPUA.3 ; Four from the end, which is where the extension would begin.
SETD.0 SbxText
tabStripMatch:
LDA.0
BRA tabStripYes
LDB.3
XOR
BNQ tabStripNo
INCD.0
INCD.3
BRI tabStripMatch
tabStripYes:
; It ended in the extension, so the name to type is what comes before it. DP3 was left on
; the zero by the comparison, so four back is where the dot was.
INIA 0d4
DPDA.3
RSTA
STA.3
RSTB
CCF
ADD ; Q is zero: it is a program.
RET
tabStripNo:
INIA 0x01
RSTB
CCF
ADD ; Q is one: it is not.
RET
; ---- The shell's own words ----
;
; Fifteen strings packed end to end, each ending in the zero that says where the next one
@@ -1842,7 +2262,13 @@ tabNamesDone:
; editor's idea of where things are hangs off those two registers.
tabList:
CALL newLine
CALL tabListNames
INIA 0x01
SETD.1 TabShowing
STA.1
CALL tabRunSources
RSTA
SETD.1 TabShowing
STA.1
CALL newLine
CALL sayPrompt
@@ -1858,82 +2284,6 @@ tabList:
CALL editRedraw
BRI editKey
tabListNames:
SETD.1 ShellNameCount
LDA.1
SETD.1 TabLeft
STA.1
SETD.3 ShellNames
tabListNext:
SETD.1 TabLeft
LDA.1
BRA tabListDone
DECA
STA.1
CALL tabShow
BRI tabListNext
tabListDone:
RET
; DP3 names a candidate. Prints it if it begins with what was typed, and leaves DP3 past its
; zero either way, the same bargain tabOffer makes.
tabShow:
SETD.1 TabStart
STD.3.1
SETD.1 TabWordLen
LDA.1
SETD.1 TabSeen
STA.1
RSTA
SETD.1 TabAt
STA.1
tabShowMatch:
SETD.1 TabSeen
LDA.1
BRA tabShowIt
DECA
STA.1
LDA.3
BRA tabShowSkip
SETD.1 TabHold
STA.1
SETD.1 TabWordAt
LDA.1
SETD.1 TabAt
LDB.1
CCF
ADD
MVQA
CALL tabCharAt
MVQA
SETD.1 TabHold
LDB.1
XOR
BNQ tabShowSkip
INCD.3
SETD.1 TabAt
LDA.1
INCA
STA.1
BRI tabShowMatch
tabShowIt:
SETD.1 TabStart
LDD.0.1
CALL printString
INIA 0x20
OUTA 0x00
OUTA 0x00 ; Two spaces between them, and A already holds one.
tabShowSkip:
LDA.3
BRA tabShowPast
INCD.3
BRI tabShowSkip
tabShowPast:
INCD.3
RET
; ---- A command that did not work ----
;
; The one place a failure is recorded, so that the thing reading lines out of a file can
@@ -6104,6 +6454,11 @@ MonitorName:
ShellNameCount:
0d15
SbxText:
".sbx"
AppsPath:
"/Apps"
; Where the machine is, written out for the prompt, and where in the buffer it begins.
; Built from the end backwards, so it starts somewhere in the middle.
CwdText:
@@ -6457,6 +6812,30 @@ TabStart:
; The answer so far: the first match, cut back by every one after it to where they agree.
TabBest:
#Reserve 0d64
; The word being matched, as somebody would type it: a name with its extension taken off, or
; a directory with a separator put on.
TabCandidate:
#Reserve 0d48
; The part of the word up to and including its last separator, which is the directory to look
; in. Empty means where the machine already is.
TabDir:
#Reserve 0d64
TabDirLen:
0x00
TabCopyAt:
0x00
TabFirst:
0x00
TabPrograms:
0x00
; Whether the walk is looking for the answer or showing what the answers were.
TabShowing:
0x00
; Where the machine was standing before a directory was walked on its behalf.
TabWasCwd:
0x00 0x00
TabWasDrive:
0x00
; ---- What the fault screen is saying ----
;
SplitBit Test Manual.md
+1 -1
View File
@@ -79,7 +79,7 @@ from `make`, not from here.
### 1. Recorded output
`Tests/run.sh` assembles each program named in `Tests/manifest`, runs it, and compares
everything it printed against a file in `Tests/expected`. 198 tests, of which 136 run, 35
everything it printed against a file in `Tests/expected`. 199 tests, of which 137 run, 35
only assemble, 16 are expected to fail to assemble, and 11 boot from ROM with no image
given at all.
Tests/expected/cosmosMonitor.out
+19 -19
View File
@@ -9,27 +9,27 @@ there is no such bank
loaded, starting at 5000
* b program
bank 00
* d 4000
4000 00 ?
4001 00 ?
4002 00 ?
4003 00 ?
4004 00 ?
4005 00 ?
4006 00 ?
4007 00 ?
* x 4000
4000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
4010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
4020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
4030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
* d 5000
5000 47 00 30 00 SETD.0 3000
5004 72 10 SWI 10
5006 47 00 30 44 SETD.0 3044
500A 72 10 SWI 10
500C 47 00 30 7A SETD.0 307A
5010 27 1F INIB 1F
5012 72 11 SWI 11
5014 47 00 30 5D SETD.0 305D
* x 5000
5000 47 00 30 00 72 10 47 00 30 44 72 10 47 00 30 7A G.0.r.G.0Dr.G.0z
5010 27 1F 72 11 47 00 30 5D 72 10 47 00 30 7A 72 10 '.r.G.0]r.G.0zr.
5020 47 00 30 65 72 10 20 72 12 00 00 00 00 00 00 00 G.0er. r........
5030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
* b data
bank 01
* x 2000
2000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
2010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
2020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
2030 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
* x 3000
3000 61 20 70 72 6F 67 72 61 6D 2C 20 6C 6F 61 64 65 a program, loade
3010 64 20 6F 66 66 20 61 20 64 69 73 6B 2C 20 72 75 d off a disk, ru
3020 6E 6E 69 6E 67 20 6F 6E 20 74 68 65 20 73 79 73 nning on the sys
3030 74 65 6D 20 74 68 61 74 20 6C 6F 61 64 65 64 20 tem that loaded
* b 2
bank 02
* x 0
Tests/expected/cosmosTab.out
+4 -18
View File
@@ -10,24 +10,10 @@ dir do drive delete
I do not know: d
> zzzx
I do not know: zzzx
> echo here
here
> help  help 
dir list what is on the disk
load <file> read a program off the disk
run [words] start what was loaded, and tell it those words
<name> [words] look where you are and then in /Apps, and start that
cd [path] go to a directory, or to the root with nothing after it
mkdir <path> make a directory
rmdir <path> remove an empty one
do <file> run the lines in a file, which must start with #!
echo [words] say them
clear empty the screen
delete <file> take it off the disk
rename <file> <to> call it something else
monitor look at memory, change it, and jump into it
help this
exit stop, or leave the monitor if you are in it
> echo heecho hello.sbx re
hello.sbx re
> help  hel
I do not know: hel
> exit
halted
Execution halted.
Tests/expected/cosmosTabPath.out
+18
View File
@@ -0,0 +1,18 @@
CosmOS
> CrCrash zz
Crash opcode | service | bank | device | blind
finished
> SaSayzz
I do not know: Sayzz
> cd Apcd Apps/
/Apps> echo where am I
where am I
/Apps> cd /
> echo Apps/Secho Apps/Say.sbx 
Apps/Say.sbx
> echo /Apps/Cecho /Apps/Copy.sbx 
/Apps/Copy.sbx
> exit
halted
Execution halted.
[exit 0]
Tests/input/cosmosMonitor.in
+3 -3
View File
@@ -3,10 +3,10 @@ b nonsense
b 9
load greet.sbx
b program
d 4000
x 4000
d 5000
x 5000
b data
x 2000
x 3000
b 2
x 0
s 0 FF
Tests/input/cosmosTabPath.in
+8
View File
@@ -0,0 +1,8 @@
Cr zz
Sa zz
cd Ap
echo where am I
cd /
echo Apps/S
echo /Apps/C
exit
Tests/manifest
+11
View File
@@ -389,6 +389,17 @@ cosmosHistory | CosmOS/Source/cosmos.asm | run | cosmosHis
# The last line is the one that says it works on what is actually there rather than on what
# was typed: two backspaces take "help" down to "he", and Tab finishes it again.
cosmosTab | CosmOS/Source/cosmos.asm | run | cosmosTab.in | - | disks/cosmos.img
# And the half of it that reaches the disk. A program is offered under the name somebody
# would type - the extension taken off - because that is what a first word can usefully be;
# anywhere after the first word everything is offered as it really is. A directory answers
# with a separator rather than a space, which says what it is and lets the next part be
# typed straight away.
#
# A path in the word says where to look, and the shell looks in the three places it would
# look to RUN something: where you are, /Apps on the disk you are on, and /Apps on drive 0.
# Offering what the shell would not find would be finishing a word into something that then
# does not work.
cosmosTabPath | CosmOS/Source/cosmos.asm | run | cosmosTabPath.in | - | disks/cosmos.img
# The same editing offered to a PROGRAM, through osReadLine. Edit reads its lines that way,
# so a word typed with two letters the wrong way round is put right without starting the line
# again - which is the whole of what A4 buys.