59cc89c2c2
files, curses, db, regex etc that we already have). The other glue will follow shortly. Obtained from: Keith Bostic <bostic@bostic.com>
148 lines
5.2 KiB
Plaintext
148 lines
5.2 KiB
Plaintext
CL: In single-line screens, have to press 'q' twice when quitting out
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of a ":set all" display.
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COMMON: There's a serious problem with error returns -- we need to separate
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command failure from fatal error, consistently, over the entire source
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tree.
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We need to rework all of vi to have three return values:
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0: success
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1: vi error, continue
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2: fatal error, die
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Right now we don't recognize fatal errors for what they are.
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VI: Change the screen scrolling to not eat user characters... i.e.
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g/pattern/foo should not eat already entered chars.
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COMMON: It's known that it's possible to sync the backing files in the
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wrong manner, leaving backup files that aren't recoverable. This
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is going to be left alone until we have a logging version of DB,
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which will hopefully fix this (or at least make it possible to
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easily do so).
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COMMON: The complete list of POSIX.1 calls that can return EINTR are:
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wait, waitpid, sleep, dup2, close, read, write,
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fcntl(SETLCKW) tcsetattr, tcdrain
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The problem is that technically, any system/library call can
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return EINTR, so, while nvi blocks (most of?) the obvious ones,
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someone may have to do a complete pass and block signals
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everywhere.
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COMMON: The vi main command loop should use the general-purpose overflow
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and underflow routines. In addition, the vi command loop uses
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unsigned longs -- should probably be fixed as a 32-bit unsigned
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type, and then check to make sure it's never used as as variable
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type again.
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DB: When nvi edits files that don't have trailing newlines, it appends
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one, regardless. This is required, by default, from POSIX.2.
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COMMON: Open mode is not yet implemented.
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COMMON: ^C isn't passed to the shell in the script windows as an interrupt
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character.
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COMMON: The options:
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hardtabs, lisp, optimize, redraw, slowopen
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are recognized, but not implemented. These options are unlikely
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to be implemented, so if you want them you might want to say
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something! I will implement lisp if anyone ever documents how it
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worked.
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COMMON: If you run out of space in the recovery directory, the recovery
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file is left in place.
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COMMON: Should "view" set a lock on the file?
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COMMON: Field editing shouldn't be hard to add to nvi:
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Field editing file template:
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version #
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field # row/column start row/column stop
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label field # Label string
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re field # Matching re string.
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field # row/column start row/column stop
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label field # Label string
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re field # Matching re string.
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<tab> moves to the next field
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<bs> in column 0 moves to the previous field
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COMMON: Let's rethink using an IPC mechanism:
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Two way channel, with events passing in both directions.
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Load into the same address space (else, how do file permissions) forks
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in v_init -- screens get events from vi, vi gets events queued up from
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screens.
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Vi:
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E_CHARACTER, /* Input character: e_c set. */
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E_EOF, /* End of input (NOT ^D). */
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E_ERR, /* Input error. */
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E_INTERRUPT, /* Interrupt. */
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E_REPAINT, /* Repaint: e_flno, e_tlno set. */
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E_RESIZE, /* SIGWINCH: e_lno, e_cno set. */
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E_SIGCONT, /* SIGCONT arrived. */
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E_SIGFATAL, /* fatal signal arrived.
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E_START, /* Start ex/vi. */
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E_STOP, /* Stop ex/vi. */
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E_STRING, /* Input string: e_csp, e_len set. */
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Screen:
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E_ADDSTR /* Add a string to the screen. */
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E_ATTRIBUTE /* Screen attribute. */
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E_BELL /* Beep/bell/flash the terminal. */
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E_BUSY /* Display a busy message. */
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E_CANONICAL /* Enter tty canonical mode. */
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E_CLRTOEOL /* Clear to the end of the line. */
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E_CURSOR /* Return the cursor location. */
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E_DELETELN /* Delete a line. */
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E_DISCARD /* Discard a screen. */
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E_EXADJUST /* Ex: screen adjustment routine. */
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E_FMAP /* Set a function key. */
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E_GETKEY /* Get a key event. */
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E_INSERTLN /* Insert a line. */
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E_MOVE /* Move the cursor. */
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E_MESSAGE /* Message or ex output. */
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E_REFRESH /* Refresh the screen. */
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E_RESIZE /* Resize two screens. */
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E_SPLIT /* Split the screen. */
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E_SUSPEND /* Suspend the editor. */
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EX: It would be nice to inverse video the replaced text during
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interactive substitute.
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EX: The :args command should put the current file name out in reverse
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video. This isn't going to be easy, currently only full lines can
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be in reverse video, not just parts.
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TK: We currently permit the user to change the lines, columns and term
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edit options. Shouldn't that be illegal in tknvi?
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VI: The strings found by searches should be highlighted until the next
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character is entered.
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VI: Display a split vi screen for the :help command.
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VI: When getting a key for a continue screen, we should always read from
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the terminal, not from a mapped key.
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VI: The sentence, paragraph and section movement commands don't match
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historic practice in some boundary cases. This should be left
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alone until POSIX 1003.2 makes up its mind.
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VI: The vs_sm_fill routine should scroll if possible, not always redraw.
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VI: Think about setting a dirty/inuse bits on the lines of the SMAP
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structure. That way the message routines could steal lines and
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refresh would continue to work, because it would know not to touch
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the lines that were in use.
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