From 6273f655c8e5a1b7233f94fd606ceaed95b9c7a7 Mon Sep 17 00:00:00 2001 From: Erik Andersen Date: Fri, 17 Mar 2000 01:12:41 +0000 Subject: Several fixes. -Erik --- shell/cmdedit.c | 260 ++++++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 225 insertions(+), 35 deletions(-) (limited to 'shell/cmdedit.c') diff --git a/shell/cmdedit.c b/shell/cmdedit.c index d1604f1d1..314e8cd66 100644 --- a/shell/cmdedit.c +++ b/shell/cmdedit.c @@ -47,6 +47,8 @@ #define ESC 27 #define DEL 127 +#define member(c, s) ((c) ? ((char *)strchr ((s), (c)) != (char *)NULL) : 0) +#define whitespace(c) (((c) == ' ') || ((c) == '\t')) static struct history *his_front = NULL; /* First element in command line list */ static struct history *his_end = NULL; /* Last element in command line list */ @@ -104,7 +106,7 @@ void cmdedit_reset_term(void) xioctl(fileno(stdin), TCSETA, (void *) &old_term); } -void gotaSignal(int sig) +void prepareToDie(int sig) { cmdedit_reset_term(); fprintf(stdout, "\n"); @@ -175,6 +177,40 @@ void input_backspace(int outputFd, int *cursor, int *len) } } +char **username_completion_matches( char* matchBuf) +{ + fprintf(stderr, "\nin username_completion_matches\n"); + return ( (char**) NULL); +} +char **command_completion_matches( char* matchBuf) +{ + fprintf(stderr, "\nin command_completion_matches\n"); + return ( (char**) NULL); +} +char **directory_completion_matches( char* matchBuf) +{ + fprintf(stderr, "\nin directory_completion_matches\n"); + return ( (char**) NULL); +} + +/* + * This function is used to grab a character buffer + * from the input file descriptor and allows you to + * a string with full command editing (sortof like + * a mini readline). + * + * The following standard commands are not implemented: + * ESC-b -- Move back one word + * ESC-f -- Move forward one word + * ESC-d -- Delete back one word + * ESC-h -- Delete forward one word + * CTL-t -- Transpose two characters + * + * Furthermore, the "vi" command editing keys are not implemented. + * + * TODO: implement TAB command completion. :) + * + */ extern int cmdedit_read_input(int inputFd, int outputFd, char command[BUFSIZ]) { @@ -185,6 +221,8 @@ extern int cmdedit_read_input(int inputFd, int outputFd, int cursor = 0; int break_out = 0; int ret = 0; + int lastWasTab = FALSE; + char **matches = (char **)NULL; char c = 0; struct history *hp = his_end; @@ -209,90 +247,233 @@ extern int cmdedit_read_input(int inputFd, int outputFd, if ((ret = read(inputFd, &c, 1)) < 1) return ret; - + switch (c) { - case 1: /* Control-A Beginning of line */ + case 1: + /* Control-a -- Beginning of line */ input_home(outputFd, &cursor); - break; - case 5: /* Control-E EOL */ + case 5: + /* Control-e -- End of line */ input_end(outputFd, &cursor, len); break; - case 4: /* Control-D */ + case 2: + /* Control-b -- Move back one character */ + if (cursor > 0) { + xwrite(outputFd, "\033[D", 3); + cursor--; + } + break; + case 6: + /* Control-f -- Move forward one character */ + if (cursor < len) { + xwrite(outputFd, "\033[C", 3); + cursor++; + } + break; + case 4: + /* Control-d -- Delete one character */ if (cursor != len) { input_delete(outputFd, cursor); len--; + } else if (len == 0) { + prepareToDie(0); + exit(0); + } + break; + case 14: + /* Control-n -- Get next command */ + if (hp && hp->n && hp->n->s) { + free( hp->s); + hp->s = strdup(parsenextc); + hp = hp->n; + goto hop; } break; - case '\b': /* Backspace */ + case 16: + /* Control-p -- Get previous command */ + if (hp && hp->p) { + free( hp->s); + hp->s = strdup(parsenextc); + hp = hp->p; + goto hop; + } + break; + case '\t': + { + /* Do TAB completion */ + int in_command_position=0, ti=len-1; + + if (lastWasTab == FALSE) { + char *tmp; + char *matchBuf; + + if (matches) { + free(matches); + matches = (char **)NULL; + } + + matchBuf = (char *) calloc(BUFSIZ, sizeof(char)); + + /* Make a local copy of the string -- up + * to the the position of the cursor */ + strcpy( matchBuf, parsenextc); + matchBuf[cursor+1] = '\0'; + + /* skip leading white space */ + tmp = matchBuf; + while (*tmp && isspace(*tmp)) { + (tmp)++; + ti++; + } + + /* Determine if this is a command word or not */ + //while ((ti > -1) && (whitespace (matchBuf[ti]))) { +//printf("\nti=%d\n", ti); + // ti--; + // } +printf("\nti=%d\n", ti); + + if (ti < 0) { + in_command_position++; + } else if (member(matchBuf[ti], ";|&{(`")) { + int this_char, prev_char; + in_command_position++; + /* Handle the two character tokens `>&', `<&', and `>|'. + We are not in a command position after one of these. */ + this_char = matchBuf[ti]; + prev_char = matchBuf[ti - 1]; + + if ((this_char == '&' && (prev_char == '<' || prev_char == '>')) || + (this_char == '|' && prev_char == '>')) { + in_command_position = 0; + } + /* For now, do not bother with catching quoted + * expressions and marking them as not in command + * positions. Some other day. Or not. + */ + //else if (char_is_quoted (matchBuf, ti)) { + // in_command_position = 0; + //} + } +printf("\nin_command_position=%d\n", in_command_position); + /* If the word starts in `~', and there is no slash in the word, + * then try completing this word as a username. */ + if (*matchBuf == '~' && !strchr (matchBuf, '/')) + matches = username_completion_matches(matchBuf); + + /* If this word is in a command position, then complete over possible + * command names, including aliases, built-ins, and executables. */ + if (!matches && in_command_position) { + matches = command_completion_matches(matchBuf); + + /* If we are attempting command completion and nothing matches, + * then try and match directories as a last resort... */ + if (!matches) + matches = directory_completion_matches(matchBuf); + } + } else { + printf("\nprinting match list\n"); + } + /* Rewrite the whole line (for debugging) */ + for (; cursor > 0; cursor--) + xwrite(outputFd, "\b", 1); + len = strlen(parsenextc); + xwrite(outputFd, parsenextc, len); + cursor = len; + break; + } + case '\b': case DEL: + /* Backspace */ input_backspace(outputFd, &cursor, &len); break; - case '\n': /* Enter */ + case '\n': + /* Enter */ *(parsenextc + len++ + 1) = c; xwrite(outputFd, &c, 1); break_out = 1; break; - case ESC: /* escape sequence follows */ + case ESC: { + /* escape sequence follows */ if ((ret = read(inputFd, &c, 1)) < 1) return ret; if (c == '[') { /* 91 */ if ((ret = read(inputFd, &c, 1)) < 1) return ret; - + switch (c) { case 'A': - if (hp && hp->p) { /* Up */ + /* Up Arrow -- Get previous command */ + if (hp && hp->p) { + free( hp->s); + hp->s = strdup(parsenextc); hp = hp->p; goto hop; } break; case 'B': - if (hp && hp->n && hp->n->s) { /* Down */ + /* Down Arrow -- Get next command */ + if (hp && hp->n && hp->n->s) { + free( hp->s); + hp->s = strdup(parsenextc); hp = hp->n; goto hop; } break; - hop: /* hop */ + /* This is where we rewrite the line + * using the selected history item */ + hop: len = strlen(parsenextc); - for (; cursor > 0; cursor--) /* return to begining of line */ + /* return to begining of line */ + for (; cursor > 0; cursor--) xwrite(outputFd, "\b", 1); + xwrite(outputFd, parsenextc, len); - for (j = 0; j < len; j++) /* erase old command */ + /* erase old command */ + for (j = 0; j < len; j++) xwrite(outputFd, " ", 1); - for (j = len; j > 0; j--) /* return to begining of line */ + /* return to begining of line */ + for (j = len; j > 0; j--) xwrite(outputFd, "\b", 1); - strcpy(parsenextc, hp->s); /* write new command */ + memset(parsenextc, 0, BUFSIZ); + /* write new command */ + strcpy(parsenextc, hp->s); len = strlen(hp->s); xwrite(outputFd, parsenextc, len); cursor = len; break; - case 'C': /* Right */ + case 'C': + /* Right Arrow -- Move forward one character */ if (cursor < len) { xwrite(outputFd, "\033[C", 3); cursor++; } break; - case 'D': /* Left */ + case 'D': + /* Left Arrow -- Move back one character */ if (cursor > 0) { xwrite(outputFd, "\033[D", 3); cursor--; } break; - case '3': /* Delete */ + case '3': + /* Delete */ if (cursor != len) { input_delete(outputFd, cursor); len--; } break; - case '1': /* Home (Ctrl-A) */ + case '1': + /* Home (Ctrl-A) */ input_home(outputFd, &cursor); break; - case '4': /* End (Ctrl-E) */ + case '4': + /* End (Ctrl-E) */ input_end(outputFd, &cursor, len); break; } @@ -300,20 +481,24 @@ extern int cmdedit_read_input(int inputFd, int outputFd, if ((ret = read(inputFd, &c, 1)) < 1) return ret; /* read 126 (~) */ } - if (c == 'O') { /* 79 */ + if (c == 'O') { + /* 79 */ if ((ret = read(inputFd, &c, 1)) < 1) return ret; switch (c) { - case 'H': /* Home (xterm) */ + case 'H': + /* Home (xterm) */ input_home(outputFd, &cursor); break; - case 'F': /* End (xterm) */ + case 'F': + /* End (xterm) */ input_end(outputFd, &cursor, len); break; } } c = 0; break; + } default: /* If it's regular input, do the normal thing */ @@ -343,6 +528,10 @@ extern int cmdedit_read_input(int inputFd, int outputFd, xwrite(outputFd, &c, 1); break; } + if (c=='\t') + lastWasTab = TRUE; + else + lastWasTab = FALSE; if (break_out) /* Enter is the command terminator, no more input. */ break; @@ -353,32 +542,33 @@ extern int cmdedit_read_input(int inputFd, int outputFd, reset_term = 0; - if (*(parsenextc)) { /* Handle command history log */ + /* Handle command history log */ + if (*(parsenextc)) { struct history *h = his_end; - if (!h) { /* No previous history */ + if (!h) { + /* No previous history */ h = his_front = malloc(sizeof(struct history)); h->n = malloc(sizeof(struct history)); h->p = NULL; h->s = strdup(parsenextc); - h->n->p = h; h->n->n = NULL; h->n->s = NULL; his_end = h->n; history_counter++; - } else { /* Add a new history command */ - + } else { + /* Add a new history command */ h->n = malloc(sizeof(struct history)); - h->n->p = h; h->n->n = NULL; h->n->s = NULL; h->s = strdup(parsenextc); his_end = h->n; - if (history_counter >= MAX_HISTORY) { /* After max history, remove the last known command */ + /* After max history, remove the oldest command */ + if (history_counter >= MAX_HISTORY) { struct history *p = his_front->n; @@ -398,8 +588,8 @@ extern int cmdedit_read_input(int inputFd, int outputFd, extern void cmdedit_init(void) { atexit(cmdedit_reset_term); - signal(SIGINT, gotaSignal); - signal(SIGQUIT, gotaSignal); - signal(SIGTERM, gotaSignal); + signal(SIGINT, prepareToDie); + signal(SIGQUIT, prepareToDie); + signal(SIGTERM, prepareToDie); } #endif /* BB_FEATURE_SH_COMMAND_EDITING */ -- cgit v1.2.3