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2021-06-23vi: fix read outside of text buffer during insertS Harris
Signed-off-by: S Harris <S.E.Harris@kent.ac.uk> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-21vi: fix backward search with GNU regexRon Yorston
With FEATURE_VI_REGEX_SEARCH enabled backward searches don't work. This is problematic on distros that enable regexes, such as Tiny Core Linux and Fedora. When calling GNU re_search() with a negative range parameter (indicating a backward search) the start offset must be set to the end of the area being searched. The return value of re_search() is the offset of the matched pattern from the start of the area being searched. For a successful search (positive return value) char_search() can return the pointer to the start of the area plus the offset. FEATURE_VI_REGEX_SEARCH isn't enabled by default but when it is: function old new delta char_search 256 247 -9 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-9) Total: -9 bytes Signed-off-by: Andrey Dobrovolsky <andrey.dobrovolsky.odessa@gmail.com> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-16vi: reject change command when motion failsRon Yorston
If the motion command used to define the range of a change, yank or delete fails the whole command should be rejected. BusyBox vi already handled failed searches in these circumstances. Add some more cases: - non-existent mark: d'x - movement beyond end of file: c99999+ or 99999<< This is implemented using a global variable which is set when a command error is detected. Unlike the case of motion within a line it's insufficient to check that the motion command doesn't move the cursor: this fails to process 'LyL' correctly, for example, as the second 'L' doesn't move the cursor. function old new delta indicate_error 75 82 +7 find_range 686 692 +6 do_cmd 4851 4852 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 14/0) Total: 14 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-16vi: up/down motion beyond end of file should failRon Yorston
In traditional vi and vim line motion commands ('+'/'-'/'j'/'k') fail if the movement would exceed the bounds of the file. BusyBox vi allowed such commands to succeed, leaving the cursor on the first or last character of the file. Make BusyBox vi work like vi/vim. For the 'G'/'H'/'L' commands traditional vi treats an out of bounds result as an error, vim doesn't. BusyBox vi behaves like vim, both before and after this patch. function old new delta do_cmd 4785 4851 +66 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 66/0) Total: 66 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-16vi: keep autoindent if line isn't emptyRon Yorston
When ESC is entered to leave insert mode any autoindent should only be removed if there's no content beyond the indent. This may be the case if a line has been split by entering insert mode and then entering a CR. Add a check to ensure there's only a newline after the indent. function old new delta char_insert 912 929 +17 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 17/0) Total: 17 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-14vi: initialise tabstop once not for each fileRon Yorston
The default tabstop value should be set during early start up, not reset for each new file. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-14vi: ':r' should insert text after current lineRon Yorston
When no line number is specified ':read' should place the inserted text after the current line, not before. This used to be correct but was broken when commit 0c42a6b07 (vi: fix empty line range regression) revealed a bug in commit 7a8ceb4eb (vi: changes to line addresses for colon commands). function old new delta colon 3960 3952 -8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-8) Total: -8 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-13*: --help tweaksDenys Vlasenko
function old new delta .rodata 103190 103189 -1 packed_usage 33590 33566 -24 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-25) Total: -25 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-02vi: remove autoindent from otherwise empty linesRon Yorston
Lines that have no content apart from automatic indentation should be treated as empty when the user hits return or ESC. The implementation uses the global variable 'indentcol'. Usually this is zero. It can also be -1 to indicate an 'O' (open above) command, replacing the overloading of the tabstop option bit. A value greater than zero indicates that the current line has been autoindented to the given column (or that the autoindent has been adjusted with ctrl-D). Any other change to the line resets 'indentcol' to zero. Replace strspn() with ident_len(). The latter handles the unlikely case that it's called on the last line of a file which doesn't have a terminating newline. function old new delta char_insert 741 912 +171 indent_len - 42 +42 do_cmd 4781 4785 +4 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 2/0 up/down: 217/0) Total: 217 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-02vi: make autoindent respect expandtab settingRon Yorston
Autoindent took a copy of the indent from a neighbouring line, which may not have respected the expandtab setting. Determine the target column and construct a suitable indent. This will consist entirely of spaces if expandtab is enabled or an efficient combination of tabs and spaces otherwise. function old new delta char_insert 719 741 +22 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 22/0) Total: 22 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-02vi: make cursor positioning more vi compatibleRon Yorston
Commit 24effc7a3 (vi: cursor positioning after whole-line 'y') tried to save a few bytes by treating whole-line deletion the same as whole-line yank. If the deletion removed the last lines of the file the cursor was left beyond the end of the file. Revert the part of the commit related to whole-line deletion. Position the cursor on the first non-whitespace character of the line when whole lines are 'put'. function old new delta do_cmd 4759 4781 +22 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 22/0) Total: 22 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-05-04vi: :wq/:x should warn if there are more files to editRon Yorston
':wq' or ':x' should issue a warning if there are more files to edit, unless they're followed by '!'. function old new delta colon 3911 3960 +49 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 49/0) Total: 49 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-05-04vi: cursor positioning after whole-line 'y'Ron Yorston
The 'y' command to yank text should leave the cursor at the start of the range. This mostly works correctly in BusyBox vi but not for whole-line yanks with backward motion, e.g. '2yk' to yank two lines backwards. In this case the cursor is left at the end of the range. Fix this by returning the actual range from find_range(). Cursor positioning following whole-line deletion is inconsistent between vim and traditional vi. For BusyBox vi chose the option that uses least code without being exactly compatible with either. Also, find_range() preserved the value of 'dot', the current cursor position. Since this isn't used by either caller of find_range() we can save a few bytes by not bothering. function old new delta do_cmd 4730 4759 +29 find_range 749 686 -63 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 29/-63) Total: -34 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-05-01vi: trivial code shrinkDenys Vlasenko
function old new delta get_input_line 178 176 -2 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-30vi: fix empty line range regressionRon Yorston
Commit 7a8ceb4eb (vi: changes to line addresses for colon commands) was supposed to address the issue: When the last address is empty it should refer to the current line. This was intended to allow ranges of the form '1,' with an empty last address. It should have been expressed as: When the last address is empty *and the second last isn't* it should refer to the current line. Otherwise a command like ':w' only writes the current line resulting in serious loss of data. function old new delta colon 3906 3911 +5 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 5/0) Total: 5 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: expand '%' and '#' in colon commandsRon Yorston
Track the current and alternate filenames. The placeholders '%' and '#' can be used in arguments to colon commands to represent the current and alternate filenames respectively. Backslash can be used to allow literal '%' and '#' characters to be entered. This feature is controlled by the configuration option FEATURE_VI_COLON_EXPAND. function old new delta expand_args - 198 +198 colon 3751 3927 +176 update_filename - 70 +70 init_filename - 48 +48 .rodata 105218 105239 +21 get_one_char 115 124 +9 edit_file 835 838 +3 do_cmd 4724 4727 +3 init_text_buffer 190 172 -18 ------------------------------------------------------------------------------ (add/remove: 3/0 grow/shrink: 5/1 up/down: 528/-18) Total: 510 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: fix buffer overrun; code shrinkRon Yorston
It was possible for get_input_line() to store its NUL terminator one character beyond the end of its buffer. Code shrink in colon(): - Certain colon commands can be matched exactly, as any shorter string would be matched earlier, e.g. ':wq' versus ':write'. - Command matching is now case sensitive so there's no need to check for 'N' or 'Q' suffixes. - Rewrite how commands and arguments are split. function old new delta colon 3848 3751 -97 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-97) Total: -97 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: improvements to ':read' commandRon Yorston
Improvements to ':read': - When a file is read into the current buffer the cursor should be placed on the first line read. - If invoked without supplying a filename the current filename should be used. This is similar to how ':edit' works. - The code for ':edit' included an explicit check that the current filename was non-empty. Both vim and traditional vi accept non-empty filenames, only issuing an error message when an attempt to use such a name fails. - Allow undo of a file read. function old new delta file_insert 367 382 +15 colon 3841 3848 +7 .rodata 105236 105218 -18 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 22/-18) Total: 4 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: preserve state when switching fileRon Yorston
When a new file is opened from an existing editing session the following details should be preserved: - the last command used; - the last character searched for on a line. function old new delta edit_file 849 835 -14 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-14) Total: -14 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: 'ZZ' should warn if there are more files to editRon Yorston
When 'ZZ' was used to save the current file and more files were available to edit BusyBox vi immediately moved on to the next file. The correct behaviour is to issue a warning. function old new delta do_cmd 4673 4724 +51 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 51/0) Total: 51 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: saving unnamed file in readonly modeRon Yorston
Suppose vi is started with the command 'vi -R', that is, in readonly mode with no filename. Attempting to save the file with 'ZZ' or ':w' results in the message: '(null)' is read only Skip the code which prints this if no filename was provided, thus falling through to file_write() which gives the more helpful message 'No current filename'. function old new delta colon 3867 3874 +7 do_cmd 4668 4673 +5 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 12/0) Total: 12 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: adjust conditional compilation of modifying_cmdsRon Yorston
Since commit 74d565ff1 (vi: make context marks more like vi) the list of commands that modify the text is no longer required when FEATURE_VI_YANKMARK is enabled, only FEATURE_VI_DOT_CMD. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-28vi: changes to line addresses for colon commandsRon Yorston
Make line addresses behave more like vi: - Vi allows the user to enter an arbitrary number of addresses, though only the last two are used. This simplifies get_address() by reducing the amount of state that needs to be carried. - When a command requires a single address the last one entered is used. - If addresses are separated by a ';' instead of a ',' the current line is updated to the left address. This may be useful when a search is used to specify a range, e.g. ':/first/;/last/d'. - When the last address is empty it should refer to the current line. function old new delta colon 3855 3834 -21 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-21) Total: -21 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-20vi: make de-indentation with ctrl-D more like vimRon Yorston
Commit ac6495f6f (vi: allow ctrl-D to reduce indentation) treated ctrl-D during autoindent as a backspace. This was adequate for indentation using tabs but doesn't work well with the expandtab option. In the latter case it's necessary to backspace over all the spaces. Make ctrl-D work correctly when spaces are present in the indent. Also, make it behave more like vim: - ctrl-D is independent of autoindent; - indentation is reduced even when the cursor isn't positioned at the end of the indent. function old new delta char_insert 679 717 +38 get_column - 37 +37 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/0 up/down: 75/0) Total: 75 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-20vi: add expandtab optionRon Yorston
This implements the vim option expandtab in BusyBox vi. From vim help: In Insert mode: Use the appropriate number of spaces to insert a <Tab>. Spaces are used in indents with the '>' and '<' commands and when 'autoindent' is on. To insert a real tab when 'expandtab' is on, use CTRL-V<Tab>. This implementation doesn't change how BusyBox vi handles autoindent: it continues to copy the indentation from a neighbouring line. If that line has tabs in its indentation so too will the new line. function old new delta char_insert 563 679 +116 next_column - 48 +48 .rodata 105211 105236 +25 colon 3844 3855 +11 refresh 1000 982 -18 move_to_col 83 59 -24 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 3/2 up/down: 200/-42) Total: 158 bytes Signed-off-by: Peter D <urmum69@snopyta.org> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: move undo_queue_state in globals to other byte-sized membersDenys Vlasenko
function old new delta vi_main 278 275 -3 undo_queue_commit 62 56 -6 undo_push 374 362 -12 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-21) Total: -21 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: allow line addresses to have an offsetRon Yorston
Line addresses in colon commands can be defined using an expression that includes '+' or '-' operators. The implementation follows traditional vi: - The first term in the expression defines an address. It can be an absolute line number, '.', '$', a search or a marker. - The second and subsequent terms must be non-negative integers. - If the first term is missing '.' is assumed. If the operator is missing addition is assumed. If the final term in missing an offset of 1 is assumed. Thus the following are valid addresses: .+1 .+ + .1 .-1 .- - The following are not valid (though they are in vim): .+$ .$ 2+. function old new delta colon 3701 3844 +143 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 143/0) Total: 143 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: allow backward search to specify line addressRon Yorston
It should be possible to use a backward search as a line address in colon commands. function old new delta colon 3661 3701 +40 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 40/0) Total: 40 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: detect and warn about invalid line addressesRon Yorston
BusyBox vi didn't have proper handling for invalid markers or unsuccessful searches in colon line addresses. This could result in the wrong lines being affected by a change. Detect when an invalid address is specified, propagate an error indicator up the call chain and issue a warning. function old new delta colon 3604 3661 +57 .rodata 105195 105211 +16 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 73/0) Total: 73 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: code shrink colon line addressesRon Yorston
Remove some unnecessary code in get_one_address() and rewrite get_address(). function old new delta colon 3325 3604 +279 get_one_address 342 - -342 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 1/0 up/down: 279/-342) Total: -63 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: make context marks more like viRon Yorston
The context marks that are automatically updated and can be used with the "''" command didn't behave the same as in vi. Marks were only being set for certain editing commands when they should have been set on successful movement commands. Make BusyBox vi behave more like vi. function old new delta .rodata 105179 105194 +15 do_cmd 4723 4668 -55 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 15/-55) Total: -40 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: correct autoindent for 'O' commandRon Yorston
Opening a line above the current line with the 'O' command should use the current, not previous, line to determine how much to autoindent. function old new delta char_insert 531 563 +32 do_cmd 4746 4723 -23 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 32/-23) Total: 9 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: allow ctrl-D to reduce indentationRon Yorston
When whitespace has been automatically added to a new line due to autoindent entering ctrl-D should reduce the level of indentation. Implement an approximation of this by treating ctrl-D as backspace. For the common case of indentation using tabs this is good enough. My attempt at a full implementation was three times bigger. function old new delta char_insert 476 531 +55 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 55/0) Total: 55 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: don't move cursor when yanking whole linesRon Yorston
When whole lines are yanked using 'yy' or 'Y' vi doesn't change the cursor position. Make BusyBox vi do the same. function old new delta do_cmd 4776 4786 +10 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 10/0) Total: 10 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: reset command count when specifying '0' rangeRon Yorston
Since commit a54450248 (vi: allow the '.' command to have a repetition count) using '0' to specify a range doesn't work with a non-zero repeat count, e.g. '1d0'. Users wouldn't normally try to do that but the '.' command does. Add a special case in get_motion_char() to handle this. function old new delta find_range 737 746 +9 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 9/0) Total: 9 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: code shrink motion by paragraphRon Yorston
Use a hand-coded loop to search for paragraph boundaries instead of calling char_search(). We were using a loop anyway to skip consecutive newlines. function old new delta do_cmd 4792 4752 -40 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-40) Total: -40 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: position cursor on last column of tabRon Yorston
Vi places the cursor on the last column of a tab character whereas BusyBox vi puts it on the first. This is disconcerting for experienced vi users and makes it impossible to distinguish visually between an empty line and one containing just a tab. It wasn't always this way. Prior to commit e3cbfb91d (vi: introduce FEATURE_VI_8BIT) BusyBox vi also put the cursor on the last column. However there were problems with cursor positioning when text was inserted before a tab. Commit eaabf0675 (vi: multiple fixes by Natanael Copa) includes a partial attempt to fix this. (The code is still present but it's never executed. Clever compilers optimise it away.) Revert the changes of commit e3cbfb91d and fix the insert problem for all tabs, not just the first. To quote Natanael: "Costs a few bytes but its worth it imho". function old new delta refresh 974 1000 +26 move_to_col 81 83 +2 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 28/0) Total: 28 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-15vi: correctly record deleted charactersRon Yorston
The undo queue didn't record deleted characters properly. For example, insert some text, backspace over a couple of characters then exit insert mode. At this point undo will restore two nulls instead of the deleted characters. The fix is in undo_push(): record the state of the UNDO_USE_SPOS flag and clear it before using 'u_type'. Also, update the comments to reflect the fact that UNDO_QUEUED_FLAG isn't actually used. function old new delta undo_push 443 435 -8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-8) Total: -8 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-13vi: allow writing to another file if this one is readonlyAlison Winters
Version 2. Same change but rebased after Ron's improvements. Fixes bug where if you open a read only file, you can't save it as a different filename. function old new delta colon 3160 3162 +2 Signed-off-by: Alison Winters <alisonatwork@outlook.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: improvements to reporting of changesRon Yorston
Traditional vi is mostly silent about the results of yank, delete, change, undo or substitution commands. Vim reports some details about undo and substitution. BusyBox vi is positively verbose in comparison. Make some improvements to BusyBox vi: - Add vim-like reporting of changes caused by substitutions, of the form '64 substitutions on 53 lines'. This replaces a fairly useless report of the result of the last change made. - Ensure that the report about put operations correctly reflects the newly introduced repetition count. - Commit 25d2592640 tried to limit status updates for delete and yank operations by detecting whether the register had changed. This didn't always work because the previously allocated memory could be reused for the new register contents. Fix this by delaying freeing the old register until after the new one has been allocated. - Add a configuration option to control verbose status reporting. This is on by default. Turning it off make BusyBox vi as taciturn as traditional vi and saves 435 bytes. function old new delta colon 3212 3292 +80 yank_status - 74 +74 static.text_yank 99 86 -13 string_insert 130 76 -54 do_cmd 4842 4776 -66 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/3 up/down: 154/-133) Total: 21 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: issue a warning on failure to find a characterRon Yorston
When a search for a character within a line fails issue a warning. function old new delta ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0) Total: 0 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: make the substitute command more like viRon Yorston
Make the ':s/find/replace/g' command behave more like vi: - the final delimiter is optional if no flag is specified; - the cursor is moved to the first visible character of the last line where a substitution was made; - a warning is displayed if no substitution was made. function old new delta colon 3156 3212 +56 .rodata 105133 105142 +9 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 65/0) Total: 65 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: make put commands more like viRon Yorston
Make the put commands 'p' and 'P' behave more like vi: - allow a repetition count to be specified; - when the text being inserted doesn't include a newline the cursor should be positioned at the end of the inserted text. function old new delta do_cmd 4765 4842 +77 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 77/0) Total: 77 bytes v2: Don't break build when FEATURE_VI_UNDO is disabled. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: allow the '.' command to have a repetition countRon Yorston
The '.' command repeats the last text change. When it has a repetition count replay the change the number of times requested. Update the stored count if it changes. For example, 3dw deletes 3 words . deletes another 3 words 2. deletes 2 words and changes the stored count . deletes 2 words function old new delta do_cmd 4746 4781 +35 .rodata 105133 105138 +5 edit_file 887 849 -38 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/1 up/down: 40/-38) Total: 2 bytes v2: Change implementation to include repetition count in string. Otherwise repeating 'r' doesn't work properly. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: allow 'r' command to be aborted, repeatedRon Yorston
Make the 'r' command behave more like vi: - abort the command if ESC is entered after the 'r'; - allow a repeat count to be entered before the 'r'; - if the repeat count exceeds the space available on the line don't change any characters and issue an alert. function old new delta do_cmd 4679 4746 +67 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 67/0) Total: 67 bytes v2: Don't break build when FEATURE_VI_UNDO is disabled. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: improvements to undoRon Yorston
The left shift operator ('<') didn't support undo at all; right shift ('>') required changes to be undone separately for each line. Allow both types of shift to be undone as a single operation. Also, neither traditional vi nor vim yank the lines being shifted by the '<' and '>' commands, so remove that call to yank_delete(); When a repetition count was specified for the '~', 'x', 'X' or 's' commands the changes had to be undone one character at a time. Allow undo as a single operation (though the delete and change parts of the 's' command still have to be undone separately). function old new delta undo_push_insert 37 40 +3 do_cmd 4695 4663 -32 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/1 up/down: 3/-32) Total: -29 bytes v2: Don't break build when FEATURE_VI_UNDO is disabled. Don't reset 'undo_del' too early in '~' handling code. Code shrink '~'. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: more fixes to range selection by wordRon Yorston
An example in my vi book presents different ways to fix the spelling of the last word in a line: ... anyweigh. With the cursor on the 'e' the command 'cway' should do the job. Since commit 776b56d77, though, 'cw' incorrectly includes the full stop in the range if we're on the last line of the file. (Prior to commit 776b56d77 BusyBox vi got 'cw' right in this case but 'cW' wrong: it *didn't* delete the full stop.) Reinstate some of the bloat removed by the earlier commit to fix this. Also, commit 7b4c2276a (vi: fix word operations across line boundaries) incorrectly ignores whitespace after a single character word. Adjust the condition to avoid this. function old new delta find_range 707 737 +30 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 30/0) Total: 30 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: improvements to range selectionRon Yorston
Rewrite find_range(), pushing quite a bit of code from do_cmd() down into it. - The commands 'y', 'd', 'c', '<' and '>' can be given twice to specify a whole-line range. BusyBox vi actually accepted any second character from that group, e.g. 'dc' or '<y', with the latter being accepted even if yank was disabled. Require the two characters to match. - '<' and '>' commands followed by ESC incorrectly issued an alert. - Allow search commands and a marker (specified as "y'a", for example) to define a range for those operators that support it. function old new delta find_range 518 707 +189 .rodata 105119 105133 +14 get_motion_char 68 - -68 do_cmd 4860 4695 -165 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 2/1 up/down: 203/-233) Total: -30 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-11vi: code shrink search commandsRon Yorston
Changes to search commands ('/', '?', 'n' and 'N'): - Rewrite to be smaller and (possibly) clearer. - Issue a warning when a repeat search is requested without a previous search having been made. Vim and BusyBox vi support a repetition count for searches though the original vi doesn't. If the count exceeds the number of occurrences of the search string the search may loop through the file multiple times. function old new delta .rodata 105135 105119 -16 do_cmd 4898 4860 -38 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-54) Total: -54 bytes Signed-off-by; Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-04-08vi: changes to option handlingRon Yorston
Since commit 70ee23399 (vi: code shrink) the ':set' command is unable to process multiple options on a line. Fix this by temporarily null-terminating each option. Change the default setting for all options to off to match vim. Actually, 'flash' isn't an option in vim, only traditional vi, where it's on by default. In vim the corresponding option is 'visualbell' which defaults to off. POSIX doesn't have either of these. Allow the abbreviation 'ts' for the 'tabstop' option. Issue an error message if: - an option is not implemented - an option that takes a value has no '=' or has a 'no' prefix - a boolean option has a '=' function old new delta colon 2944 3003 +59 .rodata 103171 103189 +18 vi_main 274 270 -4 setops 73 - -73 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 2/1 up/down: 77/-77) Total: 0 bytes v2: Try harder to detect invalid options. Thanks to Peter D for pointing this out. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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