diff options
| -rw-r--r-- | libbb/Config.src | 8 | ||||
| -rw-r--r-- | libbb/lineedit.c | 165 |
2 files changed, 161 insertions, 12 deletions
diff --git a/libbb/Config.src b/libbb/Config.src index 0ea8f43ab..aa442365a 100644 --- a/libbb/Config.src +++ b/libbb/Config.src @@ -94,6 +94,14 @@ config FEATURE_EDITING_SAVEHISTORY help Enable history saving in shells. +config FEATURE_REVERSE_SEARCH + bool "Reverse history search" + default y + depends on FEATURE_EDITING_SAVEHISTORY + help + Enable readline-like Ctrl-R combination for reverse history search. + Increases code by about 0.5k. + config FEATURE_TAB_COMPLETION bool "Tab completion" default y diff --git a/libbb/lineedit.c b/libbb/lineedit.c index 4e3bc0ef7..10265192e 100644 --- a/libbb/lineedit.c +++ b/libbb/lineedit.c @@ -207,18 +207,21 @@ static void deinit_S(void) #if ENABLE_UNICODE_SUPPORT -static size_t load_string(const char *src, int maxsize) +static size_t load_string(const char *src) { if (unicode_status == UNICODE_ON) { - ssize_t len = mbstowcs(command_ps, src, maxsize - 1); + ssize_t len = mbstowcs(command_ps, src, S.maxsize - 1); if (len < 0) len = 0; command_ps[len] = BB_NUL; return len; } else { unsigned i = 0; - while ((command_ps[i] = src[i]) != 0) + while (src[i] && i < S.maxsize - 1) { + command_ps[i] = src[i]; i++; + } + command_ps[i] = BB_NUL; return i; } } @@ -319,9 +322,9 @@ static wchar_t adjust_width_and_validate_wc(wchar_t wc) return wc; } #else /* !UNICODE */ -static size_t load_string(const char *src, int maxsize) +static size_t load_string(const char *src) { - safe_strncpy(command_ps, src, maxsize); + safe_strncpy(command_ps, src, S.maxsize); return strlen(command_ps); } # if ENABLE_FEATURE_TAB_COMPLETION @@ -1224,10 +1227,10 @@ static NOINLINE void input_tab(smallint *lastWasTab) strcpy(match_buf, &command[cursor_mb]); /* where do we want to have cursor after all? */ strcpy(&command[cursor_mb], chosen_match + match_pfx_len); - len = load_string(command, S.maxsize); + len = load_string(command); /* add match and tail */ sprintf(&command[cursor_mb], "%s%s", chosen_match + match_pfx_len, match_buf); - command_len = load_string(command, S.maxsize); + command_len = load_string(command); /* write out the matched command */ /* paranoia: load_string can return 0 on conv error, * prevent passing pos = (0 - 12) to redraw */ @@ -1948,6 +1951,140 @@ static int isrtl_str(void) #undef CTRL #define CTRL(a) ((a) & ~0x40) +enum { + VI_CMDMODE_BIT = 0x40000000, + /* 0x80000000 bit flags KEYCODE_xxx */ +}; + +#if ENABLE_FEATURE_REVERSE_SEARCH +/* Mimic readline Ctrl-R reverse history search. + * When invoked, it shows the following prompt: + * (reverse-i-search)'': user_input [cursor pos unchanged by Ctrl-R] + * and typing results in search being performed: + * (reverse-i-search)'tmp': cd /tmp [cursor under t in /tmp] + * Search is performed by looking at progressively older lines in history. + * Ctrl-R again searches for the next match in history. + * Backspace deletes last matched char. + * Control keys exit search and return to normal editing (at current history line). + */ +static int32_t reverse_i_search(void) +{ + char match_buf[128]; /* for user input */ + char read_key_buffer[KEYCODE_BUFFER_SIZE]; + const char *matched_history_line; + const char *saved_prompt; + int32_t ic; + + matched_history_line = NULL; + read_key_buffer[0] = 0; + match_buf[0] = '\0'; + + /* Save and replace the prompt */ + saved_prompt = cmdedit_prompt; + goto set_prompt; + + while (1) { + int h; + unsigned match_buf_len = strlen(match_buf); + + fflush_all(); +//FIXME: correct timeout? + ic = lineedit_read_key(read_key_buffer, -1); + + switch (ic) { + case CTRL('R'): /* searching for the next match */ + break; + + case '\b': + case '\x7f': + /* Backspace */ + if (unicode_status == UNICODE_ON) { + while (match_buf_len != 0) { + uint8_t c = match_buf[--match_buf_len]; + if ((c & 0xc0) != 0x80) /* start of UTF-8 char? */ + break; /* yes */ + } + } else { + if (match_buf_len != 0) + match_buf_len--; + } + match_buf[match_buf_len] = '\0'; + break; + + default: + if (ic < ' ' + || (!ENABLE_UNICODE_SUPPORT && ic >= 256) + || (ENABLE_UNICODE_SUPPORT && ic >= VI_CMDMODE_BIT) + ) { + goto ret; + } + + /* Append this char */ +#if ENABLE_UNICODE_SUPPORT + if (unicode_status == UNICODE_ON) { + mbstate_t mbstate = { 0 }; + char buf[MB_CUR_MAX + 1]; + int len = wcrtomb(buf, ic, &mbstate); + if (len > 0) { + buf[len] = '\0'; + if (match_buf_len + len < sizeof(match_buf)) + strcpy(match_buf + match_buf_len, buf); + } + } else +#endif + if (match_buf_len < sizeof(match_buf) - 1) { + match_buf[match_buf_len] = ic; + match_buf[match_buf_len + 1] = '\0'; + } + break; + } /* switch (ic) */ + + /* Search in history for match_buf */ + h = state->cur_history; + if (ic == CTRL('R')) + h--; + while (h >= 0) { + if (state->history[h]) { + char *match = strstr(state->history[h], match_buf); + if (match) { + state->cur_history = h; + matched_history_line = state->history[h]; + command_len = load_string(matched_history_line); + cursor = match - matched_history_line; +//FIXME: cursor position for Unicode case + + free((char*)cmdedit_prompt); + set_prompt: + cmdedit_prompt = xasprintf("(reverse-i-search)'%s': ", match_buf); + cmdedit_prmt_len = strlen(cmdedit_prompt); + goto do_redraw; + } + } + h--; + } + + /* Not found */ + match_buf[match_buf_len] = '\0'; + beep(); + continue; + + do_redraw: + redraw(cmdedit_y, command_len - cursor); + } /* while (1) */ + + ret: + if (matched_history_line) + command_len = load_string(matched_history_line); + + free((char*)cmdedit_prompt); + cmdedit_prompt = saved_prompt; + cmdedit_prmt_len = strlen(cmdedit_prompt); + redraw(cmdedit_y, command_len - cursor); + + return ic; +} +#endif + /* maxsize must be >= 2. * Returns: * -1 on read errors or EOF, or on bare Ctrl-D, @@ -2062,15 +2199,14 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman * clutters the big switch a bit, but keeps all the code * in one place. */ - enum { - VI_CMDMODE_BIT = 0x40000000, - /* 0x80000000 bit flags KEYCODE_xxx */ - }; int32_t ic, ic_raw; fflush_all(); ic = ic_raw = lineedit_read_key(read_key_buffer, timeout); +#if ENABLE_FEATURE_REVERSE_SEARCH + again: +#endif #if ENABLE_FEATURE_EDITING_VI newdelflag = 1; if (vi_cmdmode) { @@ -2174,6 +2310,11 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman while (cursor > 0 && !BB_isspace(command_ps[cursor-1])) input_backspace(); break; +#if ENABLE_FEATURE_REVERSE_SEARCH + case CTRL('R'): + ic = ic_raw = reverse_i_search(); + goto again; +#endif #if ENABLE_FEATURE_EDITING_VI case 'i'|VI_CMDMODE_BIT: @@ -2327,7 +2468,7 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman /* Rewrite the line with the selected history item */ /* change command */ command_len = load_string(state->history[state->cur_history] ? - state->history[state->cur_history] : "", maxsize); + state->history[state->cur_history] : ""); /* redraw and go to eol (bol, in vi) */ redraw(cmdedit_y, (state->flags & VI_MODE) ? 9999 : 0); break; |