diff options
| -rw-r--r-- | editors/vi.c | 502 |
1 files changed, 448 insertions, 54 deletions
diff --git a/editors/vi.c b/editors/vi.c index 097f309..e38667a 100644 --- a/editors/vi.c +++ b/editors/vi.c @@ -17,7 +17,6 @@ * it would be easier to change the mark when add/delete lines * More intelligence in refresh() * ":r !cmd" and "!cmd" to filter text through an external command - * A true "undo" facility * An "ex" line oriented mode- maybe using "cmdedit" */ @@ -136,6 +135,36 @@ //config: cursor position using "ESC [ 6 n" escape sequence, then read stdin. //config: //config: This is not clean but helps a lot on serial lines and such. +//config:config FEATURE_VI_UNDO +//config: bool "Support undo command 'u'" +//config: default y +//config: depends on VI +//config: help +//config: Support the 'u' command to undo insertion, deletion, and replacement +//config: of text. +//config:config FEATURE_VI_UNDO_QUEUE +//config: bool "Enable undo operation queuing" +//config: default y +//config: depends on FEATURE_VI_UNDO +//config: help +//config: The vi undo functions can use an intermediate queue to greatly lower +//config: malloc() calls and overhead. When the maximum size of this queue is +//config: reached, the contents of the queue are committed to the undo stack. +//config: This increases the size of the undo code and allows some undo +//config: operations (especially un-typing/backspacing) to be far more useful. +//config:config FEATURE_VI_UNDO_QUEUE_MAX +//config: int "Maximum undo character queue size" +//config: default 256 +//config: range 32 65536 +//config: depends on FEATURE_VI_UNDO_QUEUE +//config: help +//config: This option sets the number of bytes used at runtime for the queue. +//config: Smaller values will create more undo objects and reduce the amount +//config: of typed or backspaced characters that are grouped into one undo +//config: operation; larger values increase the potential size of each undo +//config: and will generally malloc() larger objects and less frequently. +//config: Unless you want more (or less) frequent "undo points" while typing, +//config: you should probably leave this unchanged. //applet:IF_VI(APPLET(vi, BB_DIR_BIN, BB_SUID_DROP)) @@ -347,6 +376,42 @@ struct globals { char get_input_line__buf[MAX_INPUT_LEN]; /* former static */ char scr_out_buf[MAX_SCR_COLS + MAX_TABSTOP * 2]; +#if ENABLE_FEATURE_VI_UNDO +// undo_push() operations +#define UNDO_INS 0 +#define UNDO_DEL 1 +#define UNDO_INS_CHAIN 2 +#define UNDO_DEL_CHAIN 3 +// UNDO_*_QUEUED must be equal to UNDO_xxx ORed with UNDO_QUEUED_FLAG +#define UNDO_QUEUED_FLAG 4 +#define UNDO_INS_QUEUED 4 +#define UNDO_DEL_QUEUED 5 +#define UNDO_USE_SPOS 32 +#define UNDO_EMPTY 64 +// Pass-through flags for functions that can be undone +#define NO_UNDO 0 +#define ALLOW_UNDO 1 +#define ALLOW_UNDO_CHAIN 2 +#if ENABLE_FEATURE_VI_UNDO_QUEUE +#define ALLOW_UNDO_QUEUED 3 + char undo_queue_state; + int undo_q; + char *undo_queue_spos; // Start position of queued operation + char undo_queue[CONFIG_FEATURE_VI_UNDO_QUEUE_MAX]; +#else +// If undo queuing disabled, don't invoke the missing queue logic +#define ALLOW_UNDO_QUEUED 1 +#endif /* ENABLE_FEATURE_VI_UNDO_QUEUE */ + + struct undo_object { + struct undo_object *prev; // Linking back avoids list traversal (LIFO) + int u_type; // 0=deleted, 1=inserted, 2=swapped + int start; // Offset where the data should be restored/deleted + int length; // total data size + char *undo_text; // ptr to text that will be inserted + } *undo_stack_tail; +#endif /* ENABLE_FEATURE_VI_UNDO */ + }; #define G (*ptr_to_globals) #define text (G.text ) @@ -408,6 +473,16 @@ struct globals { #define last_modifying_cmd (G.last_modifying_cmd ) #define get_input_line__buf (G.get_input_line__buf) +#if ENABLE_FEATURE_VI_UNDO +#define undo_stack_tail (G.undo_stack_tail ) +# if ENABLE_FEATURE_VI_UNDO_QUEUE +#define undo_queue_state (G.undo_queue_state) +#define undo_q (G.undo_q ) +#define undo_queue (G.undo_queue ) +#define undo_queue_spos (G.undo_queue_spos ) +# endif +#endif + #define INIT_G() do { \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ last_file_modified = -1; \ @@ -437,10 +512,12 @@ static void dot_next(void); // move dot to next line B-o-l static void dot_prev(void); // move dot to prev line B-o-l static void dot_scroll(int, int); // move the screen up or down static void dot_skip_over_ws(void); // move dot pat WS -static void dot_delete(void); // delete the char at 'dot' static char *bound_dot(char *); // make sure text[0] <= P < "end" static char *new_screen(int, int); // malloc virtual screen memory -static char *char_insert(char *, char); // insert the char c at 'p' +#if !ENABLE_FEATURE_VI_UNDO +#define char_insert(a,b,c) char_insert(a,b) +#endif +static char *char_insert(char *, char, int); // insert the char c at 'p' // might reallocate text[]! use p += stupid_insert(p, ...), // and be careful to not use pointers into potentially freed text[]! static uintptr_t stupid_insert(char *, char); // stupidly insert the char c at 'p' @@ -448,11 +525,17 @@ static int find_range(char **, char **, char); // return pointers for an object static int st_test(char *, int, int, char *); // helper for skip_thing() static char *skip_thing(char *, int, int, int); // skip some object static char *find_pair(char *, char); // find matching pair () [] {} -static char *text_hole_delete(char *, char *); // at "p", delete a 'size' byte hole +#if !ENABLE_FEATURE_VI_UNDO +#define text_hole_delete(a,b,c) text_hole_delete(a,b) +#endif +static char *text_hole_delete(char *, char *, int); // at "p", delete a 'size' byte hole // might reallocate text[]! use p += text_hole_make(p, ...), // and be careful to not use pointers into potentially freed text[]! static uintptr_t text_hole_make(char *, int); // at "p", make a 'size' byte hole -static char *yank_delete(char *, char *, int, int); // yank text[] into register then delete +#if !ENABLE_FEATURE_VI_UNDO +#define yank_delete(a,b,c,d,e) yank_delete(a,b,c,d) +#endif +static char *yank_delete(char *, char *, int, int, int); // yank text[] into register then delete static void show_help(void); // display some help info static void rawmode(void); // set "raw" mode on tty static void cookmode(void); // return to "cooked" mode on tty @@ -514,20 +597,34 @@ static void showmatching(char *); // show the matching pair () [] {} #if ENABLE_FEATURE_VI_YANKMARK || (ENABLE_FEATURE_VI_COLON && ENABLE_FEATURE_VI_SEARCH) || ENABLE_FEATURE_VI_CRASHME // might reallocate text[]! use p += string_insert(p, ...), // and be careful to not use pointers into potentially freed text[]! -static uintptr_t string_insert(char *, const char *); // insert the string at 'p' +# if !ENABLE_FEATURE_VI_UNDO +#define string_insert(a,b,c) string_insert(a,b) +# endif +static uintptr_t string_insert(char *, const char *, int); // insert the string at 'p' #endif #if ENABLE_FEATURE_VI_YANKMARK static char *text_yank(char *, char *, int); // save copy of "p" into a register static char what_reg(void); // what is letter of current YDreg static void check_context(char); // remember context for '' command #endif +#if ENABLE_FEATURE_VI_UNDO +static void undo_push(char *, unsigned int, unsigned char); // Push an operation on the undo stack +static void undo_pop(void); // Undo the last operation +# if ENABLE_FEATURE_VI_UNDO_QUEUE +static void undo_queue_commit(void); // Flush any queued objects to the undo stack +# else +# define undo_queue_commit() ((void)0) +# endif +#else +#define undo_queue_commit() ((void)0) +#endif + #if ENABLE_FEATURE_VI_CRASHME static void crash_dummy(); static void crash_test(); static int crashme = 0; #endif - static void write1(const char *out) { fputs(out, stdout); @@ -540,6 +637,14 @@ int vi_main(int argc, char **argv) INIT_G(); +#if ENABLE_FEATURE_VI_UNDO + /* undo_stack_tail = NULL; - already is */ +#if ENABLE_FEATURE_VI_UNDO_QUEUE + undo_queue_state = UNDO_EMPTY; + /* undo_q = 0; - already is */ +#endif +#endif + #if ENABLE_FEATURE_VI_USE_SIGNALS || ENABLE_FEATURE_VI_CRASHME my_pid = getpid(); #endif @@ -631,7 +736,7 @@ static int init_text_buffer(char *fn) } if (size < 0) { // file dont exist. Start empty buf with dummy line - char_insert(text, '\n'); + char_insert(text, '\n', NO_UNDO); rc = 0; } else { rc = file_insert(fn, text, 1); @@ -756,7 +861,7 @@ static void edit_file(char *fn) crash_dummy(); // generate a random command } else { crashme = 0; - string_insert(text, "\n\n##### Ran out of text to work on. #####\n\n"); // insert the string + string_insert(text, "\n\n##### Ran out of text to work on. #####\n\n", NO_UNDO); // insert the string dot = text; refresh(FALSE); } @@ -1015,7 +1120,7 @@ static void colon(char *buf) q = begin_line(dot); // assume .,. for the range r = end_line(dot); } - dot = yank_delete(q, r, 1, YANKDEL); // save, then delete lines + dot = yank_delete(q, r, 1, YANKDEL, ALLOW_UNDO); // save, then delete lines dot_skip_over_ws(); } else if (strncmp(cmd, "edit", i) == 0) { // Edit a file // don't edit, if the current file has been modified @@ -1175,7 +1280,7 @@ static void colon(char *buf) // if the insert is before "dot" then we need to update if (q <= dot) dot += ch; - /*file_modified++; - done by file_insert */ + // file_modified++; } } else if (strncmp(cmd, "rewind", i) == 0) { // rewind cmd line args if (file_modified && !useforce) { @@ -1235,6 +1340,9 @@ static void colon(char *buf) char *F, *R, *flags; size_t len_F, len_R; int gflag; // global replace flag +#if ENABLE_FEATURE_VI_UNDO + int dont_chain_first_item = ALLOW_UNDO; +#endif // F points to the "find" pattern // R points to the "replace" pattern @@ -1269,9 +1377,13 @@ static void colon(char *buf) if (found) { uintptr_t bias; // we found the "find" pattern - delete it - text_hole_delete(found, found + len_F - 1); - // inset the "replace" patern - bias = string_insert(found, R); // insert the string + // For undo support, the first item should not be chained + text_hole_delete(found, found + len_F - 1, dont_chain_first_item); +#if ENABLE_FEATURE_VI_UNDO + dont_chain_first_item = ALLOW_UNDO_CHAIN; +#endif + // insert the "replace" patern + bias = string_insert(found, R, ALLOW_UNDO_CHAIN); found += bias; ls += bias; /*q += bias; - recalculated anyway */ @@ -1572,23 +1684,27 @@ static char *find_line(int li) // find begining of line #li //----- Dot Movement Routines ---------------------------------- static void dot_left(void) { + undo_queue_commit(); if (dot > text && dot[-1] != '\n') dot--; } static void dot_right(void) { + undo_queue_commit(); if (dot < end - 1 && *dot != '\n') dot++; } static void dot_begin(void) { + undo_queue_commit(); dot = begin_line(dot); // return pointer to first char cur line } static void dot_end(void) { + undo_queue_commit(); dot = end_line(dot); // return pointer to last char cur line } @@ -1614,11 +1730,13 @@ static char *move_to_col(char *p, int l) static void dot_next(void) { + undo_queue_commit(); dot = next_line(dot); } static void dot_prev(void) { + undo_queue_commit(); dot = prev_line(dot); } @@ -1626,6 +1744,7 @@ static void dot_scroll(int cnt, int dir) { char *q; + undo_queue_commit(); for (; cnt > 0; cnt--) { if (dir < 0) { // scroll Backwards @@ -1653,11 +1772,6 @@ static void dot_skip_over_ws(void) dot++; } -static void dot_delete(void) // delete the char at 'dot' -{ - text_hole_delete(dot, dot); -} - static char *bound_dot(char *p) // make sure text[0] <= P < "end" { if (p >= end && end > text) { @@ -1804,17 +1918,34 @@ static char *char_search(char *p, const char *pat, int dir, int range) #endif /* FEATURE_VI_SEARCH */ -static char *char_insert(char *p, char c) // insert the char c at 'p' +static char *char_insert(char *p, char c, int undo) // insert the char c at 'p' { if (c == 22) { // Is this an ctrl-V? p += stupid_insert(p, '^'); // use ^ to indicate literal next refresh(FALSE); // show the ^ c = get_one_char(); *p = c; - p++; +#if ENABLE_FEATURE_VI_UNDO + switch (undo) { + case ALLOW_UNDO: + undo_push(p, 1, UNDO_INS); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, 1, UNDO_INS_CHAIN); + break; +# if ENABLE_FEATURE_VI_UNDO_QUEUE + case ALLOW_UNDO_QUEUED: + undo_push(p, 1, UNDO_INS_QUEUED); + break; +# endif + } +#else file_modified++; +#endif /* ENABLE_FEATURE_VI_UNDO */ + p++; } else if (c == 27) { // Is this an ESC? cmd_mode = 0; + undo_queue_commit(); cmdcnt = 0; end_cmd_q(); // stop adding to q last_status_cksum = 0; // force status update @@ -1825,7 +1956,7 @@ static char *char_insert(char *p, char c) // insert the char c at 'p' // 123456789 if ((p[-1] != '\n') && (dot>text)) { p--; - p = text_hole_delete(p, p); // shrink buffer 1 char + p = text_hole_delete(p, p, ALLOW_UNDO_QUEUED); // shrink buffer 1 char } } else { #if ENABLE_FEATURE_VI_SETOPTS @@ -1838,6 +1969,27 @@ static char *char_insert(char *p, char c) // insert the char c at 'p' #if ENABLE_FEATURE_VI_SETOPTS sp = p; // remember addr of insert #endif +#if ENABLE_FEATURE_VI_UNDO +# if ENABLE_FEATURE_VI_UNDO_QUEUE + if (c == '\n') + undo_queue_commit(); +# endif + switch (undo) { + case ALLOW_UNDO: + undo_push(p, 1, UNDO_INS); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, 1, UNDO_INS_CHAIN); + break; +# if ENABLE_FEATURE_VI_UNDO_QUEUE + case ALLOW_UNDO_QUEUED: + undo_push(p, 1, UNDO_INS_QUEUED); + break; +# endif + } +#else + file_modified++; +#endif /* ENABLE_FEATURE_VI_UNDO */ p += 1 + stupid_insert(p, c); // insert the char #if ENABLE_FEATURE_VI_SETOPTS if (showmatch && strchr(")]}", *sp) != NULL) { @@ -1853,6 +2005,9 @@ static char *char_insert(char *p, char c) // insert the char c at 'p' bias = text_hole_make(p, len); p += bias; q += bias; +#if ENABLE_FEATURE_VI_UNDO + undo_push(p, len, UNDO_INS); +#endif memcpy(p, q, len); p += len; } @@ -1870,7 +2025,6 @@ static uintptr_t stupid_insert(char *p, char c) // stupidly insert the char c at bias = text_hole_make(p, 1); p += bias; *p = c; - //file_modified++; - done by text_hole_make() return bias; } @@ -2051,6 +2205,185 @@ static void showmatching(char *p) } #endif /* FEATURE_VI_SETOPTS */ +#if ENABLE_FEATURE_VI_UNDO +// Undo functions and hooks added by Jody Bruchon (jody@jodybruchon.com) +static void undo_push(char *src, unsigned int length, unsigned char u_type) // Add to the undo stack +{ + struct undo_object *undo_temp; + // "u_type" values + // UNDO_INS: insertion, undo will remove from buffer + // UNDO_DEL: deleted text, undo will restore to buffer + // UNDO_{INS,DEL}_CHAIN: Same as above but also calls undo_pop() when complete + // The CHAIN operations are for handling multiple operations that the user + // performs with a single action, i.e. REPLACE mode or find-and-replace commands + // UNDO_{INS,DEL}_QUEUED: If queuing feature is enabled, allow use of the queue + // for the INS/DEL operation. The raw values should be equal to the values of + // UNDO_{INS,DEL} ORed with UNDO_QUEUED_FLAG + +#if ENABLE_FEATURE_VI_UNDO_QUEUE + // This undo queuing functionality groups multiple character typing or backspaces + // into a single large undo object. This greatly reduces calls to malloc() for + // single-character operations while typing and has the side benefit of letting + // an undo operation remove chunks of text rather than a single character. + switch (u_type) { + case UNDO_EMPTY: // Just in case this ever happens... + return; + case UNDO_DEL_QUEUED: + if (length != 1) + return; // Only queue single characters + switch (undo_queue_state) { + case UNDO_EMPTY: + undo_queue_state = UNDO_DEL; + case UNDO_DEL: + undo_queue_spos = src; + undo_q++; + undo_queue[(CONFIG_FEATURE_VI_UNDO_QUEUE_MAX - undo_q)] = *src; + // If queue is full, dump it into an object + if (undo_q == CONFIG_FEATURE_VI_UNDO_QUEUE_MAX) + undo_queue_commit(); + return; + case UNDO_INS: + // Switch from storing inserted text to deleted text + undo_queue_commit(); + undo_push(src, length, UNDO_DEL_QUEUED); + return; + } + break; + case UNDO_INS_QUEUED: + if (length != 1) + return; + switch (undo_queue_state) { + case UNDO_EMPTY: + undo_queue_state = UNDO_INS; + undo_queue_spos = src; + case UNDO_INS: + undo_q++; // Don't need to save any data for insertions + if (undo_q == CONFIG_FEATURE_VI_UNDO_QUEUE_MAX) + undo_queue_commit(); + return; + case UNDO_DEL: + // Switch from storing deleted text to inserted text + undo_queue_commit(); + undo_push(src, length, UNDO_INS_QUEUED); + return; + } + break; + } +#else + // If undo queuing is disabled, ignore the queuing flag entirely + u_type = u_type & ~UNDO_QUEUED_FLAG; +#endif + + // Allocate a new undo object and use it as the stack tail + undo_temp = undo_stack_tail; + undo_stack_tail = xmalloc(sizeof(struct undo_object)); +#if ENABLE_FEATURE_VI_UNDO_QUEUE + if ((u_type & UNDO_USE_SPOS) != 0) { + undo_stack_tail->start = undo_queue_spos - text; // use start position from queue + } else { + undo_stack_tail->start = src - text; // use offset from start of text buffer + } + u_type = (u_type & ~UNDO_USE_SPOS); +#else + undo_stack_tail->start = src - text; +#endif /* ENABLE_FEATURE_VI_UNDO_QUEUE */ + // For UNDO_DEL objects, copy the deleted text somewhere + switch (u_type) { + case UNDO_DEL: + case UNDO_DEL_CHAIN: + if ((src + length) == end) + length--; + // If this deletion empties text[], strip the newline. When the buffer becomes + // zero-length, a newline is added back, which requires this to compensate. + undo_stack_tail->undo_text = xmalloc(length); + memcpy(undo_stack_tail->undo_text, src, length); + break; + } + undo_stack_tail->prev = undo_temp; + undo_stack_tail->length = length; + undo_stack_tail->u_type = u_type; + file_modified++; +} + +static void undo_pop(void) // Undo the last operation +{ + int repeat = 0; + char *u_start, *u_end; + struct undo_object *undo_temp; + + // Commit pending undo queue before popping (should be unnecessary) + undo_queue_commit(); + + // Check for an empty undo stack + if (undo_stack_tail == NULL) { + status_line("Already at oldest change"); + return; + } + + switch (undo_stack_tail->u_type) { + case UNDO_DEL: + case UNDO_DEL_CHAIN: + // make hole and put in text that was deleted; deallocate text + u_start = text + undo_stack_tail->start; + text_hole_make(u_start, undo_stack_tail->length); + memcpy(u_start, undo_stack_tail->undo_text, undo_stack_tail->length); + free(undo_stack_tail->undo_text); + status_line("Undo [%d] %s %d chars at position %d", + file_modified, "restored", + undo_stack_tail->length, undo_stack_tail->start); + break; + case UNDO_INS: + case UNDO_INS_CHAIN: + // delete what was inserted + u_start = undo_stack_tail->start + text; + u_end = u_start - 1 + undo_stack_tail->length; + text_hole_delete(u_start, u_end, NO_UNDO); + status_line("Undo [%d] %s %d chars at position %d", + file_modified, "deleted", + undo_stack_tail->length, undo_stack_tail->start); + break; + } + // For chained operations, continue popping all the way down the chain. + // If this is the end of a chain, lower modification count and refresh display + switch (undo_stack_tail->u_type) { + case UNDO_DEL: + case UNDO_INS: + dot = (text + undo_stack_tail->start); + refresh(FALSE); + break; + case UNDO_DEL_CHAIN: + case UNDO_INS_CHAIN: + repeat = 1; + break; + } + // Deallocate the undo object we just processed + undo_temp = undo_stack_tail->prev; + free(undo_stack_tail); + undo_stack_tail = undo_temp; + file_modified--; + if (repeat == 1) { + undo_pop(); // Follow the undo chain if one exists + } +} + +#if ENABLE_FEATURE_VI_UNDO_QUEUE +static void undo_queue_commit(void) // Flush any queued objects to the undo stack +{ + // Pushes the queue object onto the undo stack + if (undo_q > 0) { + // Deleted character undo events grow from the end + undo_push((undo_queue + CONFIG_FEATURE_VI_UNDO_QUEUE_MAX - undo_q), + undo_q, + (undo_queue_state | UNDO_USE_SPOS) + ); + undo_queue_state = UNDO_EMPTY; + undo_q = 0; + } +} +#endif + +#endif /* ENABLE_FEATURE_VI_UNDO */ + // open a hole in text[] // might reallocate text[]! use p += text_hole_make(p, ...), // and be careful to not use pointers into potentially freed text[]! @@ -2082,12 +2415,12 @@ static uintptr_t text_hole_make(char *p, int size) // at "p", make a 'size' byte } memmove(p + size, p, end - size - p); memset(p, ' ', size); // clear new hole - file_modified++; return bias; } // close a hole in text[] -static char *text_hole_delete(char *p, char *q) // delete "p" through "q", inclusive +// "undo" value indicates if this operation should be undo-able +static char *text_hole_delete(char *p, char *q, int undo) // delete "p" through "q", inclusive { char *src, *dest; int cnt, hole_size; @@ -2102,10 +2435,29 @@ static char *text_hole_delete(char *p, char *q) // delete "p" through "q", inclu } hole_size = q - p + 1; cnt = end - src; +#if ENABLE_FEATURE_VI_UNDO + switch (undo) { + case NO_UNDO: + break; + case ALLOW_UNDO: + undo_push(p, hole_size, UNDO_DEL); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, hole_size, UNDO_DEL_CHAIN); + break; +# if ENABLE_FEATURE_VI_UNDO_QUEUE + case ALLOW_UNDO_QUEUED: + undo_push(p, hole_size, UNDO_DEL_QUEUED); + break; +# endif + } + file_modified--; +#endif if (src < text || src > end) goto thd0; if (dest < text || dest >= end) goto thd0; + file_modified++; if (src >= end) goto thd_atend; // just delete the end of the buffer memmove(dest, src, cnt); @@ -2115,7 +2467,6 @@ static char *text_hole_delete(char *p, char *q) // delete "p" through "q", inclu dest = end - 1; // make sure dest in below end-1 if (end <= text) dest = end = text; // keep pointers valid - file_modified++; thd0: return dest; } @@ -2123,7 +2474,7 @@ static char *text_hole_delete(char *p, char *q) // delete "p" through "q", inclu // copy text into register, then delete text. // if dist <= 0, do not include, or go past, a NewLine // -static char *yank_delete(char *start, char *stop, int dist, int yf) +static char *yank_delete(char *start, char *stop, int dist, int yf, int undo) { char *p; @@ -2152,7 +2503,7 @@ static char *yank_delete(char *start, char *stop, int dist, int yf) text_yank(start, stop, YDreg); #endif if (yf == YANKDEL) { - p = text_hole_delete(start, stop); + p = text_hole_delete(start, stop, undo); } // delete lines return p; } @@ -2218,12 +2569,22 @@ static void end_cmd_q(void) || ENABLE_FEATURE_VI_CRASHME // might reallocate text[]! use p += string_insert(p, ...), // and be careful to not use pointers into potentially freed text[]! -static uintptr_t string_insert(char *p, const char *s) // insert the string at 'p' +static uintptr_t string_insert(char *p, const char *s, int undo) // insert the string at 'p' { uintptr_t bias; int i; i = strlen(s); +#if ENABLE_FEATURE_VI_UNDO + switch (undo) { + case ALLOW_UNDO: + undo_push(p, i, UNDO_INS); + break; + case ALLOW_UNDO_CHAIN: + undo_push(p, i, UNDO_INS_CHAIN); + break; + } +#endif bias = text_hole_make(p, i); p += bias; memcpy(p, s, i); @@ -2516,14 +2877,14 @@ static int file_insert(const char *fn, char *p, int update_ro_status) cnt = safe_read(fd, p, size); if (cnt < 0) { status_line_bold_errno(fn); - p = text_hole_delete(p, p + size - 1); // un-do buffer insert + p = text_hole_delete(p, p + size - 1, NO_UNDO); // un-do buffer insert } else if (cnt < size) { // There was a partial read, shrink unused space text[] - p = text_hole_delete(p + cnt, p + size - 1); // un-do buffer insert + p = text_hole_delete(p + cnt, p + size - 1, NO_UNDO); // un-do buffer insert status_line_bold("can't read '%s'", fn); } - if (cnt >= size) - file_modified++; +// if (cnt >= size) +// file_modified++; close(fd); fi0: #if ENABLE_FEATURE_VI_READONLY @@ -3048,11 +3409,12 @@ static void do_cmd(int c) if (*dot == '\n') { // don't Replace past E-o-l cmd_mode = 1; // convert to insert + undo_queue_commit(); } else { if (1 <= c || Isprint(c)) { if (c != 27) - dot = yank_delete(dot, dot, 0, YANKDEL); // delete char - dot = char_insert(dot, c); // insert new char + dot = yank_delete(dot, dot, 0, YANKDEL, ALLOW_UNDO); // delete char + dot = char_insert(dot, c, ALLOW_UNDO_CHAIN); // insert new char } goto dc1; } @@ -3062,7 +3424,7 @@ static void do_cmd(int c) if (c == KEYCODE_INSERT) goto dc5; // insert the char c at "dot" if (1 <= c || Isprint(c)) { - dot = char_insert(dot, c); + dot = char_insert(dot, c, ALLOW_UNDO_QUEUED); } goto dc1; } @@ -3108,7 +3470,6 @@ static void do_cmd(int c) //case ']': // ]- //case '_': // _- //case '`': // `- - //case 'u': // u- FIXME- there is no undo //case 'v': // v- default: // unrecognized command buf[0] = c; @@ -3177,6 +3538,7 @@ static void do_cmd(int c) if (cmd_mode == 0) indicate_error(c); cmd_mode = 0; // stop insrting + undo_queue_commit(); end_cmd_q(); last_status_cksum = 0; // force status update break; @@ -3251,15 +3613,20 @@ static void do_cmd(int c) if (c == 'p') dot_right(); // move to right, can move to NL } - string_insert(dot, p); // insert the string + string_insert(dot, p, ALLOW_UNDO); // insert the string end_cmd_q(); // stop adding to q break; +#if ENABLE_FEATURE_VI_UNDO + case 'u': // u- undo last operation + undo_pop(); + break; +#endif case 'U': // U- Undo; replace current line with original version if (reg[Ureg] != NULL) { p = begin_line(dot); q = end_line(dot); - p = text_hole_delete(p, q); // delete cur line - p += string_insert(p, reg[Ureg]); // insert orig line + p = text_hole_delete(p, q, ALLOW_UNDO); // delete cur line + p += string_insert(p, reg[Ureg], ALLOW_UNDO_CHAIN); // insert orig line dot = p; dot_skip_over_ws(); } @@ -3485,7 +3852,7 @@ static void do_cmd(int c) cnt = count_lines(text, dot); // remember what line we are on c1 = get_one_char(); // get the type of thing to delete find_range(&p, &q, c1); - yank_delete(p, q, 1, YANKONLY); // save copy before change + yank_delete(p, q, 1, YANKONLY, NO_UNDO); // save copy before change p = begin_line(p); q = end_line(q); i = count_lines(p, q); // # of lines we are shifting @@ -3494,16 +3861,16 @@ static void do_cmd(int c) // shift left- remove tab or 8 spaces if (*p == '\t') { // shrink buffer 1 char - text_hole_delete(p, p); + text_hole_delete(p, p, NO_UNDO); } else if (*p == ' ') { // we should be calculating columns, not just SPACE for (j = 0; *p == ' ' && j < tabstop; j++) { - text_hole_delete(p, p); + text_hole_delete(p, p, NO_UNDO); } } } else if (c == '>') { // shift right -- add tab or 8 spaces - char_insert(p, '\t'); + char_insert(p, '\t', ALLOW_UNDO); } } dot = find_line(cnt); // what line were we on @@ -3538,7 +3905,7 @@ static void do_cmd(int c) save_dot = dot; dot = dollar_line(dot); // move to before NL // copy text into a register and delete - dot = yank_delete(save_dot, dot, 0, YANKDEL); // delete to e-o-l + dot = yank_delete(save_dot, dot, 0, YANKDEL, ALLOW_UNDO); // delete to e-o-l if (c == 'C') goto dc_i; // start inserting #if ENABLE_FEATURE_VI_DOT_CMD @@ -3583,15 +3950,22 @@ static void do_cmd(int c) case KEYCODE_INSERT: // Cursor Key Insert dc_i: cmd_mode = 1; // start inserting + undo_queue_commit(); // commit queue when cmd_mode changes break; case 'J': // J- join current and next lines together do { dot_end(); // move to NL if (dot < end - 1) { // make sure not last char in text[] +#if ENABLE_FEATURE_VI_UNDO + undo_push(dot, 1, UNDO_DEL); *dot++ = ' '; // replace NL with space + undo_push((dot - 1), 1, UNDO_INS_CHAIN); +#else + *dot++ = ' '; file_modified++; +#endif while (isblank(*dot)) { // delete leading WS - dot_delete(); + text_hole_delete(dot, dot, ALLOW_UNDO_CHAIN); } } } while (--cmdcnt > 0); @@ -3620,10 +3994,10 @@ static void do_cmd(int c) dot_prev(); case 'o': // o- open a empty line below; Yes, I know it is in the middle of the "if (..." dot_end(); - dot = char_insert(dot, '\n'); + dot = char_insert(dot, '\n', ALLOW_UNDO); } else { dot_begin(); // 0 - dot = char_insert(dot, '\n'); // i\n ESC + dot = char_insert(dot, '\n', ALLOW_UNDO); // i\n ESC dot_prev(); // - } goto dc_i; @@ -3631,6 +4005,7 @@ static void do_cmd(int c) case 'R': // R- continuous Replace char dc5: cmd_mode = 2; + undo_queue_commit(); break; case KEYCODE_DELETE: c = 'x'; @@ -3645,7 +4020,7 @@ static void do_cmd(int c) if (dot[dir] != '\n') { if (c == 'X') dot--; // delete prev char - dot = yank_delete(dot, dot, 0, YANKDEL); // delete char + dot = yank_delete(dot, dot, 0, YANKDEL, ALLOW_UNDO); // delete char } } while (--cmdcnt > 0); end_cmd_q(); // stop adding to q @@ -3716,6 +4091,7 @@ static void do_cmd(int c) c1 = get_one_char(); // get the type of thing to delete // determine range, and whether it spans lines ml = find_range(&p, &q, c1); + place_cursor(0, 0); if (c1 == 27) { // ESC- user changed mind and wants out c = c1 = 27; // Escape- do nothing } else if (strchr("wW", c1)) { @@ -3727,13 +4103,13 @@ static void do_cmd(int c) q--; } } - dot = yank_delete(p, q, ml, yf); // delete word + dot = yank_delete(p, q, ml, yf, ALLOW_UNDO); // delete word } else if (strchr("^0bBeEft%$ lh\b\177", c1)) { // partial line copy text into a register and delete - dot = yank_delete(p, q, ml, yf); // delete word + dot = yank_delete(p, q, ml, yf, ALLOW_UNDO); // delete word } else if (strchr("cdykjHL+-{}\r\n", c1)) { // whole line copy text into a register and delete - dot = yank_delete(p, q, ml, yf); // delete lines + dot = yank_delete(p, q, ml, yf, ALLOW_UNDO); // delete lines whole = 1; } else { // could not recognize object @@ -3743,7 +4119,7 @@ static void do_cmd(int c) } if (ml && whole) { if (c == 'c') { - dot = char_insert(dot, '\n'); + dot = char_insert(dot, '\n', ALLOW_UNDO_CHAIN); // on the last line of file don't move to prev line if (whole && dot != (end-1)) { dot_prev(); @@ -3789,8 +4165,14 @@ static void do_cmd(int c) case 'r': // r- replace the current char with user input c1 = get_one_char(); // get the replacement char if (*dot != '\n') { +#if ENABLE_FEATURE_VI_UNDO + undo_push(dot, 1, UNDO_DEL); + *dot = c1; + undo_push(dot, 1, UNDO_INS_CHAIN); +#else *dot = c1; file_modified++; +#endif } end_cmd_q(); // stop adding to q break; @@ -3830,6 +4212,17 @@ static void do_cmd(int c) break; case '~': // ~- flip the case of letters a-z -> A-Z do { +#if ENABLE_FEATURE_VI_UNDO + if (islower(*dot)) { + undo_push(dot, 1, UNDO_DEL); + *dot = toupper(*dot); + undo_push(dot, 1, UNDO_INS_CHAIN); + } else if (isupper(*dot)) { + undo_push(dot, 1, UNDO_DEL); + *dot = tolower(*dot); + undo_push(dot, 1, UNDO_INS_CHAIN); + } +#else if (islower(*dot)) { *dot = toupper(*dot); file_modified++; @@ -3837,6 +4230,7 @@ static void do_cmd(int c) *dot = tolower(*dot); file_modified++; } +#endif dot_right(); } while (--cmdcnt > 0); end_cmd_q(); // stop adding to q @@ -3866,7 +4260,7 @@ static void do_cmd(int c) dc1: // if text[] just became empty, add back an empty line if (end == text) { - char_insert(text, '\n'); // start empty buf with dummy line + char_insert(text, '\n', NO_UNDO); // start empty buf with dummy line dot = text; } // it is OK for dot to exactly equal to end, otherwise check dot validity |