menuconfig:inputbox: support navigate input position

This patch add support navigate input position *inside* the input
field with LEFT/RIGHT, so it is possible to modify the text in place.

Signed-off-by: Wang YanQing <udknight@gmail.com>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

1 files changed, 92 insertions, 29 deletions

diff --git a/scripts/kconfig/lxdialog/inputbox.c b/scripts/kconfig/lxdialog/inputbox.c
index dd8e587c50e2..21404a04d7c3 100644
--- a/scripts/kconfig/lxdialog/inputbox.c
+++ b/scripts/kconfig/lxdialog/inputbox.c
@@ -45,7 +45,8 @@ int dialog_inputbox(const char *title, const char *prompt, int height, int width
                     const char *init)
 {
         int i, x, y, box_y, box_x, box_width;
-        int input_x = 0, scroll = 0, key = 0, button = -1;
+        int input_x = 0, key = 0, button = -1;
+        int show_x, len, pos;
         char *instr = dialog_input_result;
         WINDOW *dialog;
 
@@ -97,14 +98,17 @@ do_resize:
         wmove(dialog, box_y, box_x);
         wattrset(dialog, dlg.inputbox.atr);
 
-        input_x = strlen(instr);
+        len = strlen(instr);
+        pos = len;
 
-        if (input_x >= box_width) {
-                scroll = input_x - box_width + 1;
+        if (len >= box_width) {
+                show_x = len - box_width + 1;
                 input_x = box_width - 1;
                 for (i = 0; i < box_width - 1; i++)
-                        waddch(dialog, instr[scroll + i]);
+                        waddch(dialog, instr[show_x + i]);
         } else {
+                show_x = 0;
+                input_x = len;
                 waddstr(dialog, instr);
         }
 
@@ -121,45 +125,104 @@ do_resize:
                         case KEY_UP:
                         case KEY_DOWN:
                                 break;
-                        case KEY_LEFT:
-                                continue;
-                        case KEY_RIGHT:
-                                continue;
                         case KEY_BACKSPACE:
                         case 127:
-                                if (input_x || scroll) {
+                                if (pos) {
                                         wattrset(dialog, dlg.inputbox.atr);
-                                        if (!input_x) {
-                                                scroll = scroll < box_width - 1 ? 0 : scroll - (box_width - 1);
-                                                wmove(dialog, box_y, box_x);
-                                                for (i = 0; i < box_width; i++)
-                                                        waddch(dialog,
-                                                               instr[scroll + input_x + i] ?
-                                                               instr[scroll + input_x + i] : ' ');
-                                                input_x = strlen(instr) - scroll;
+                                        if (input_x == 0) {
+                                                show_x--;
                                         } else
                                                 input_x--;
-                                        instr[scroll + input_x] = '\0';
-                                        mvwaddch(dialog, box_y, input_x + box_x, ' ');
+
+                                        if (pos < len) {
+                                                for (i = pos - 1; i < len; i++) {
+                                                        instr[i] = instr[i+1];
+                                                }
+                                        }
+
+                                        pos--;
+                                        len--;
+                                        instr[len] = '\0';
+                                        wmove(dialog, box_y, box_x);
+                                        for (i = 0; i < box_width; i++) {
+                                                if (!instr[show_x + i]) {
+                                                        waddch(dialog, ' ');
+                                                        break;
+                                                }
+                                                waddch(dialog, instr[show_x + i]);
+                                        }
                                         wmove(dialog, box_y, input_x + box_x);
                                         wrefresh(dialog);
                                 }
                                 continue;
+                        case KEY_LEFT:
+                                if (pos > 0) {
+                                        if (input_x > 0) {
+                                                wmove(dialog, box_y, --input_x + box_x);
+                                        } else if (input_x == 0) {
+                                                show_x--;
+                                                wmove(dialog, box_y, box_x);
+                                                for (i = 0; i < box_width; i++) {
+                                                        if (!instr[show_x + i]) {
+                                                                waddch(dialog, ' ');
+                                                                break;
+                                                        }
+                                                        waddch(dialog, instr[show_x + i]);
+                                                }
+                                                wmove(dialog, box_y, box_x);
+                                        }
+                                        pos--;
+                                }
+                                continue;
+                        case KEY_RIGHT:
+                                if (pos < len) {
+                                        if (input_x < box_width - 1) {
+                                                wmove(dialog, box_y, ++input_x + box_x);
+                                        } else if (input_x == box_width - 1) {
+                                                show_x++;
+                                                wmove(dialog, box_y, box_x);
+                                                for (i = 0; i < box_width; i++) {
+                                                        if (!instr[show_x + i]) {
+                                                                waddch(dialog, ' ');
+                                                                break;
+                                                        }
+                                                        waddch(dialog, instr[show_x + i]);
+                                                }
+                                                wmove(dialog, box_y, input_x + box_x);
+                                        }
+                                        pos++;
+                                }
+                                continue;
                         default:
                                 if (key < 0x100 && isprint(key)) {
-                                        if (scroll + input_x < MAX_LEN) {
+                                        if (len < MAX_LEN) {
                                                 wattrset(dialog, dlg.inputbox.atr);
-                                                instr[scroll + input_x] = key;
-                                                instr[scroll + input_x + 1] = '\0';
+                                                if (pos < len) {
+                                                        for (i = len; i > pos; i--)
+                                                                instr[i] = instr[i-1];
+                                                        instr[pos] = key;
+                                                } else {
+                                                        instr[len] = key;
+                                                }
+                                                pos++;
+                                                len++;
+                                                instr[len] = '\0';
+
                                                 if (input_x == box_width - 1) {
-                                                        scroll++;
-                                                        wmove(dialog, box_y, box_x);
-                                                        for (i = 0; i < box_width - 1; i++)
-                                                                waddch(dialog, instr [scroll + i]);
+                                                        show_x++;
                                                 } else {
-                                                        wmove(dialog, box_y, input_x++ + box_x);
-                                                        waddch(dialog, key);
+                                                        input_x++;
+                                                }
+
+                                                wmove(dialog, box_y, box_x);
+                                                for (i = 0; i < box_width; i++) {
+                                                        if (!instr[show_x + i]) {
+                                                                waddch(dialog, ' ');
+                                                                break;
+                                                        }
+                                                        waddch(dialog, instr[show_x + i]);
                                                 }
+                                                wmove(dialog, box_y, input_x + box_x);
                                                 wrefresh(dialog);
                                         } else
                                                 flash();        /* Alarm user about overflow */