#include <iostream>
#include <fstream>
#include <string.h>
+#include <stdlib.h>
using namespace std;
-const int buffer_size = 1024;
-const int nb_lines_max = 100000;
+int buffer_size = 1024;
+int nb_lines_max = 100000;
+
+int match(char *string, char *regexp) {
+ return strstr(string, regexp) != 0;
+}
+
+void check_opt(int argc, char **argv, int n_opt, int n, const char *help) {
+ if(n_opt + n >= argc) {
+ cerr << "Missing argument for " << argv[n_opt] << ". Expecting " << help << "." << endl;
+ exit(1);
+ }
+}
+
+int previous_visible(int current_line, int nb_lines, char **lines, char *regexp) {
+ int line = current_line - 1;
+ while(line >= 0 && !match(lines[line], regexp)) line--;
+ return line;
+}
+
+int next_visible(int current_line, int nb_lines, char **lines, char *regexp) {
+ int line = current_line + 1;
+ while(line < nb_lines && !match(lines[line], regexp)) line++;
+
+ if(line < nb_lines)
+ return line;
+ else
+ return -1;
+}
+
+void update_screen(int *current_line, int motion,
+ int nb_lines, char **lines,
+ char *regexp, int noblink) {
-void refresh_screen(int *screen_line, int *line, int nb_lines, char **lines, char *regexp, int noblink) {
char buffer[buffer_size];
- int maxx = getmaxx(stdscr);
- int maxy = min(buffer_size-2, getmaxy(stdscr));
+ int console_width = getmaxx(stdscr);
+ int console_height = getmaxy(stdscr);
+
+ int nb_printed_lines = 1, last_printer_line = -1;
+
+ // First, we find a visible line. In priority: The current, or the
+ // first visible after it, or the first visible before it.
+
+ int new_line;
+ if(match(lines[*current_line], regexp)) {
+ new_line = *current_line;
+ } else {
+ new_line = next_visible(*current_line, nb_lines, lines, regexp);
+ if(new_line < 0) {
+ new_line = previous_visible(*current_line, nb_lines, lines, regexp);
+ }
+ }
+
+ // If we found a visible line and we should move, let's move
+
+ if(new_line >= 0 && motion != 0) {
+ int l = new_line;
+ l += motion;
+
+ if(motion > 0) {
+ // We want to go down, let's find the first visible line below
+ l = next_visible(new_line, nb_lines, lines, regexp);
+ if(l >= 0) {
+ new_line = l;
+ }
+ } else {
+ // We want to go up, let's find the first visible line above
+ l = previous_visible(new_line, nb_lines, lines, regexp);
+ if(l >= 0) {
+ new_line = l;
+ }
+ }
+ }
if(!noblink) {
clear();
use_default_colors();
- printw("\n");
+ addstr("\n");
- int nb_printed_lines = 1, last_printer_line = -1;
- int y = 0;
+ // Here new_line is either a line number matching the regexp, or -1
+
+ if(new_line >= 0) {
- while(nb_printed_lines < maxy && y < nb_lines) {
- if(strstr(lines[y], regexp) &&
- (last_printer_line < 0 || strcmp(lines[y], lines[last_printer_line]))) {
- int k = 0;
+ int first_line = new_line, last_line = new_line, nb_match = 1;
- while(lines[y][k] && k < buffer_size - 2 && k < maxx - 1) {
- buffer[k] = lines[y][k];
- k++;
+ while(nb_match < console_height-1 && (first_line > 0 || last_line < nb_lines - 1)) {
+
+ if(first_line > 0) {
+ first_line--;
+ while(first_line > 0 && !match(lines[first_line], regexp)) {
+ first_line--;
+ }
+ if(match(lines[first_line], regexp)) {
+ nb_match++;
+ }
}
- if(noblink) {
- while(k < maxx - 1) {
- buffer[k++] = ' ';
+ if(last_line < nb_lines - 1) {
+ last_line++;
+ while(last_line < nb_lines - 1 && !match(lines[last_line], regexp)) {
+ last_line++;
+ }
+
+ if(match(lines[last_line], regexp)) {
+ nb_match++;
}
}
- buffer[k++] = '\n';
- buffer[k++] = '\0';
-
- if(nb_printed_lines == *line + 1) {
- attron(COLOR_PAIR(2));
- printw(buffer);
- attroff(COLOR_PAIR(2));
- } else {
- printw(buffer);
+ }
+
+ for(int l = first_line; l <= last_line; l++) {
+ if(match(lines[l], regexp)) {
+ int k = 0;
+
+ while(lines[l][k] && k < buffer_size - 2 && k < console_width - 1) {
+ buffer[k] = lines[l][k];
+ k++;
+ }
+
+ if(noblink) {
+ while(k < console_width - 1) {
+ buffer[k++] = ' ';
+ }
+ }
+
+ buffer[k++] = '\n';
+ buffer[k++] = '\0';
+
+ if(l == new_line) {
+ attron(COLOR_PAIR(2));
+ addstr(buffer);
+ attroff(COLOR_PAIR(2));
+ } else {
+ addstr(buffer);
+ }
+
+ last_printer_line = l;
+ nb_printed_lines++;
}
+ }
- last_printer_line = y;
- nb_printed_lines++;
+ if(motion != 0) {
+ *current_line = new_line;
}
- y++;
}
if(noblink) { // Erase the rest of the window. That's slightly ugly.
int k = 0;
- while(k < maxx - 1) {
+ while(k < console_width - 1) {
buffer[k++] = ' ';
}
buffer[k++] = '\n';
buffer[k++] = '\0';
- for(int l = nb_printed_lines; l < maxy; l++) {
- printw(buffer);
+ for(int l = nb_printed_lines; l < console_height; l++) {
+ addstr(buffer);
}
}
move(0, 0);
attron(COLOR_PAIR(1));
sprintf(buffer, "%d/%d pattern: %s", nb_printed_lines - 1, nb_lines, regexp);
- for(int k = strlen(buffer); k < maxx - 1; k++) buffer[k] = ' ';
- buffer[maxx-1] = '\0';
- printw(buffer);
+ for(int k = strlen(buffer); k < console_width - 1; k++) buffer[k] = ' ';
+ buffer[console_width-1] = '\0';
+ addstr(buffer);
attroff(COLOR_PAIR(1));
refresh(); // After doing something on the display, we refresh it
char *lines[nb_lines_max];
int noblink = 1;
- char *file_name;
- char stdin_name[] = "/dev/stdin";
+ char input_filename[buffer_size], output_filename[buffer_size];
+ strcpy(input_filename, "/dev/stdin");
+ strcpy(output_filename, "/tmp/selector.out");
- if(argc == 2 && strcmp(argv[1], "-")) {
- file_name = argv[1];
- } else {
- file_name = stdin_name;
+ int i = 1;
+ while(i < argc) {
+ if(strcmp(argv[i], "-o") == 0) {
+ check_opt(argc, argv, i, 1, "<output filename>");
+ strncpy(output_filename, argv[i+1], buffer_size);
+ i += 2;
+ }
+
+ else if(strcmp(argv[i], "-f") == 0) {
+ check_opt(argc, argv, i, 1, "<input filename>");
+ strncpy(input_filename, argv[i+1], buffer_size);
+ i += 2;
+ }
+
+ else if(strcmp(argv[i], "-b") == 0) {
+ noblink = 1;
+ i++;
+ }
+
+ else if(strcmp(argv[i], "-l") == 0) {
+ check_opt(argc, argv, i, 1, "<maximum number of lines>");
+ nb_lines_max = atoi(argv[i+1]);
+ i += 2;
+ }
+
+ else {
+ cerr << argv[0] << " [-o <output filename>] [-b] [-l <max number of lines]" << endl;
+ exit(1);
+ }
}
- ifstream file(file_name);
+ ifstream file(input_filename);
if(file.fail()) {
- cerr << "Can not open \"" << file_name << "\"" << endl;
+ cerr << "Can not open \"" << input_filename << "\"" << endl;
return 1;
}
nb_lines++;
}
- char regexp[buffer_size]="";
+ char regexp[buffer_size];
+ regexp[0] = '\0';
int regexp_point;
regexp_point = 0;
keypad(stdscr, TRUE);
start_color();
- init_pair(1, COLOR_WHITE, COLOR_BLACK);
+ // init_pair(1, COLOR_WHITE, COLOR_BLACK);
+ init_pair(1, COLOR_WHITE, COLOR_GREEN);
init_pair(2, COLOR_BLACK, COLOR_YELLOW);
int key;
- int line = 0, screen_line = 0;
+ int line = 0;
- refresh_screen(&screen_line, &line, nb_lines, lines, regexp, noblink);
+ update_screen(&line, 0, nb_lines, lines, regexp, noblink);
do {
key = getch();
+ int motion = 0;
+
if(key >= ' ' && key <= 'z') {
regexp[regexp_point++] = key;
regexp[regexp_point] = '\0';
}
- else if(key == KEY_BACKSPACE || key == KEY_DC) {
+ else if(key == KEY_BACKSPACE || key == KEY_DC || key == '\b') {
if(regexp_point > 0) {
regexp_point--;
regexp[regexp_point] = '\0';
}
else if(key == KEY_UP || key == '\10') {
- if(line > 0) {
- line--;
- }
+ motion = -1;
}
else if(key == KEY_DOWN || key == '\ e') {
- line++;
+ motion = 1;
}
- refresh_screen(&screen_line, &line, nb_lines, lines, regexp, noblink);
+ update_screen(&line, motion, nb_lines, lines, regexp, noblink);
} while(key != '\n' && key != KEY_ENTER && key != '\a');
echo();
curs_set(1);
endwin();
+ ofstream out(output_filename);
+ if(out.fail()) {
+ cerr << "Can not open " << output_filename << " for writing." << endl;
+ exit(1);
+ } else {
+ if((key == KEY_ENTER || key == '\n') && line >= 0 && line < nb_lines) {
+ out << lines[line] << endl;
+ } else {
+ out << endl;
+ }
+ out.flush();
+ }
+
for(int l = 0; l < nb_lines; l++) {
delete[] lines[l];
}
- return 0;
+ exit(0);
}
projects / selector.git / blobdiff