manual viewer, "swap colors" system call

2 files changed, 274 insertions, 1 deletions

diff --git a/src/user/include/pland/syscall.h b/src/user/include/pland/syscall.h
index 14164aa..ead5fea 100644
--- a/src/user/include/pland/syscall.h
+++ b/src/user/include/pland/syscall.h
@@ -140,7 +140,8 @@ enum _scn {
   _SCN_PRINT_AT,
   _SCN_COUNT_OF_DIR,
   _SCN_CLEAR_SCREEN,
-  _SCN_SET_COLOR
+  _SCN_SET_COLOR,
+  _SCN_SWAP_COLOR
 };
 
 static inline uint32_t _sc0(enum _scn eax) {
@@ -285,4 +286,8 @@ static inline void _set_color(_vga_color_t color) {
   _sc1(_SCN_SET_COLOR, color);
 }
 
+static inline void _swap_color(uint8_t row, uint8_t col) {
+  _sc1(_SCN_SWAP_COLOR, (row << 8) | col);
+}
+
 #endif
\ No newline at end of file
diff --git a/src/user/manual/manual.c b/src/user/manual/manual.c
new file mode 100644
index 0000000..48f4f65
--- /dev/null
+++ b/src/user/manual/manual.c
@@ -0,0 +1,268 @@
+#include <knob/heap.h>
+#include <knob/file.h>
+#include <knob/block.h>
+#include <knob/format.h>
+#include <pland/syscall.h>
+
+#define ERROR_COLOR _COLOR_BG_LGRAY | _COLOR_FG_RED
+#define UI_COLOR    _COLOR_BG_LGRAY | _COLOR_FG_BLACK
+#define DEFAULT_TEXT_COLOR _COLOR_BG_BLACK | _COLOR_FG_WHITE
+
+#define MAN_ROOT "man/"
+#define MRL 4
+#define MAN_EXT "man"
+
+#define MAX_PATH_LEN 255
+
+#define SP80 "                                                                                "
+#define SP79 "                                                                               "
+#define SP69 "                                                                     "
+#define SP10 "          "
+
+struct file *cur_file = 0;
+
+uint32_t *line_offsets = 0;
+uint32_t n_lines;
+
+struct link {
+  uint32_t line;
+  uint8_t col;
+  uint8_t len;
+  char *lto;
+};
+
+struct link *link_table_start = 0;
+struct link *link_table_end;
+
+struct link *cur_link = 0;
+
+uint32_t line_on;
+
+#define DATA_BUF_SIZE 2000
+
+void print_page() {
+  uint8_t buf[DATA_BUF_SIZE];//1840 + up to 160 color codes
+  seek_file_to(cur_file, line_offsets[line_on]);
+  uint8_t *bufp = buf + DATA_BUF_SIZE;
+  uint8_t *bufend;
+  uint8_t row = 1, col = 0;
+
+  _set_color(DEFAULT_TEXT_COLOR);
+  while (row != 24) {
+    if (bufp == buf + DATA_BUF_SIZE) {
+      bufp = buf;
+      uint16_t bl = read_from_file(cur_file, DATA_BUF_SIZE, buf);
+      bufend = bl == DATA_BUF_SIZE ? 0 : buf + bl;
+    }
+    if (bufp == bufend) {
+      uint32_t *i = buf;
+      uint16_t l = 80 - col + (23 - row) * 80;
+      uint32_t *e = i + l / 4 + 1;
+      while (i != e)
+        *(i++) = 0x20202020;
+      buf[l] = '\0';
+      _print_at(row, col, buf);
+      break;
+    }
+    if (*bufp & 0x80)
+      _set_color(*bufp & 0x7f);
+    else {
+      char bufpb[2] = {*bufp, '\0'};
+      _print_at(row, col, bufpb);
+      if (++col == 80) {
+        col = 0;
+        ++row;
+      }
+    }
+    ++bufp;
+  }
+
+  if (cur_link)
+    for (uint8_t c = cur_link->col; c < cur_link->col + cur_link->len; ++c)
+      _swap_color(cur_link->line - line_on + 1, c);
+}
+
+void scroll_to(uint32_t n) {
+  if (n > n_lines - 23)
+    n = n_lines - 23;
+
+  if (cur_link && ((cur_link->line < n) || (cur_link->line >= n + 23)))
+    cur_link = 0;
+
+  line_on = n;
+  print_page();
+
+  char b[16] = "Line ";
+  itosz(line_on, b + 5);
+
+  _set_color(UI_COLOR);
+  _print_at(24, 0, SP69);
+  _print_at(24, 0, b);
+}
+
+void scroll_link() {
+  if (cur_link->line < line_on)
+    scroll_to(cur_link->line);
+  else if (cur_link->line >= line_on + 23)
+    scroll_to(cur_link->line - 22);
+  else
+    print_page();
+}
+
+void load_file(const char *name) {
+  static char cur_page[MAX_PATH_LEN + 1] = MAN_ROOT;
+  uint32_t name_len = strcpy(cur_page + MRL, name);
+  strcpy(cur_page + MRL + name_len, "." MAN_EXT);
+
+  struct file *new_file = open_file(cur_page);
+  if (!new_file) {
+    _set_color(ERROR_COLOR);
+    _print_at(24, 0, SP79);
+    _print_at(24, 0, "Could not open file.");
+    return;
+  }
+
+  if (cur_file)
+    close_file(cur_file);
+  cur_file = new_file;
+
+  uint32_t tlen;
+  read_from_file(cur_file, 4, &tlen);
+  char title[81];
+  read_from_file(cur_file, tlen + 1, title);
+
+  _set_color(UI_COLOR);
+  _print_at(0, 0, SP80);
+  _print_at(0, 0, title);
+
+  if (link_table_start) {
+    for (struct link *l = link_table_start; l != link_table_end; ++l)
+      free_block(l->lto);
+    free_block(link_table_start);
+  }
+  
+  uint32_t linktc;
+  read_from_file(cur_file, 4, &linktc);
+  if (linktc) {
+    link_table_start = get_block(sizeof(struct link) * linktc);
+    link_table_end = link_table_start + linktc;
+    read_from_file(cur_file, 4, &linktc);//dummy
+
+    for (struct link *l = link_table_start; l != link_table_end; ++l) {
+      read_from_file(cur_file, 4, &l->line);
+      read_from_file(cur_file, 1, &l->col);
+      read_from_file(cur_file, 1, &l->len);
+      uint32_t lto_l;
+      read_from_file(cur_file, 4, &lto_l);
+      l->lto = get_block(lto_l + 1);
+      read_from_file(cur_file, lto_l + 1, l->lto);
+    }
+  }
+  else {
+    link_table_start = 0;
+    read_from_file(cur_file, 4, &linktc);//dummy
+  }
+
+  cur_link = 0;
+
+  if (line_offsets)
+    free_block(line_offsets);
+  
+  read_from_file(cur_file, 4, &n_lines);
+  line_offsets = get_block(n_lines * 4);
+  read_from_file(cur_file, n_lines * 4, line_offsets);
+
+  char b[11];
+  itosz(n_lines, b);
+
+  _set_color(UI_COLOR);
+  _print_at(24, 69, SP10);
+  _print_at(24, 69, b);
+
+  scroll_to(0);
+}
+
+void main() {
+  _set_color(UI_COLOR);
+  _print_at(24, 79, " ");
+
+  load_file("index");
+
+  while (true) {
+    switch (_get_key()) {
+    case 0:
+    default:
+      _yield_task();
+      break;
+    case _KEY_UP:
+      if (n_lines <= 23)
+        break;
+      if (line_on)
+        scroll_to(line_on - 1);
+      break;
+    case _KEY_DOWN:
+      if (n_lines <= 23)
+        break;
+      if (line_on < n_lines - 23)
+        scroll_to(line_on + 1);
+      break;
+    case _KEY_PUP:
+      if (n_lines <= 23)
+        break;
+      scroll_to(line_on <= 22 ? 0 : line_on - 22);
+      break;
+    case _KEY_PDOWN:
+      if (n_lines <= 23)
+        break;
+      scroll_to(line_on + 22);
+      break;
+    case _KEY_LEFT:
+      if (cur_link == link_table_start)
+        break;
+      if (cur_link) {
+        --cur_link;
+        scroll_link();
+      }
+      else if (link_table_start) {
+        struct link *l = link_table_end;
+        while (l != link_table_start) {
+          --l;
+          if (l->line <= line_on + 22)
+            break;
+        }
+        cur_link = l;
+        scroll_link();
+      }
+      break;
+    case _KEY_RIGHT:
+      if (cur_link == link_table_end - 1)
+        break;
+      if (cur_link) {
+        ++cur_link;
+        scroll_link();
+      }
+      else if (link_table_start) {
+        struct link *l = link_table_start;
+        while (l != link_table_end) {
+          if (l->line >= line_on)
+            break;
+          ++l;
+        }
+        cur_link = l;
+        scroll_link();
+      }
+      break;
+    case ' ':
+    case '\n':
+    case _KEY_NENTER:
+      if (cur_link)
+        load_file(cur_link->lto);
+      break;
+    case _KEY_ESC:
+      //TODO
+      break;
+    case 'q':
+      return;
+    }
+  }
+}
\ No newline at end of file