5800 - move `browse_trace` to `tools/` dir

3 files changed, 0 insertions, 646 deletions

diff --git a/browse_trace/Readme.md b/browse_trace/Readme.md
deleted file mode 100644
index 395058f1..00000000
--- a/browse_trace/Readme.md
+++ /dev/null
@@ -1,86 +0,0 @@
-### A debugging helper that lets you zoom in/out on a trace.
-
-To try it out, first create an example trace (from the top-level `mu/`
-directory):
-
-  ```shell
-  ./mu --trace nqueens.mu
-  ```
-
-This command will save a trace of its execution in a file called `last_run`.
-The trace consists of a series of lines, each starting with an integer depth
-and a single-word 'label', followed by a colon and whitespace.
-
-Now browse this trace:
-
-  ```shell
-  ./browse_trace/browse_trace last_run
-  ```
-
-You should now find yourself in a UI showing a subsequence of lines from the
-trace, each line starting with a numeric depth, and ending with a parenthetical
-count of trace lines hidden after it with greater depths.
-
-For example, this line:
-
-  ```
-  2 app: line1 (30)
-  ```
-
-indicates that it was logged with depth 2, and that 30 following lines have
-been hidden at a depth greater than 2.
-
-(As an experiment, hidden counts of 1000 or more are highlighted in red.)
-
-The UI provides the following hotkeys:
-
-* `q` or `ctrl-c`: Quit.
-
-* `Enter`: 'Zoom into' this line. Expand lines hidden after it that were at
-  the next higher level.
-
-* `Backspace`: 'Zoom out' on a line after zooming in, collapsing lines below
-  expanded by some series of `Enter` commands.
-
-* `j` or `down-arrow`: Move cursor down one line.
-* `k` or `up-arrow`: Move cursor up one line.
-* `J` or `ctrl-f` or `page-down`: Scroll cursor down one page.
-* `K` or `ctrl-b` or `page-up`: Scroll cursor up one page.
-* `h` or `left-arrow`: Scroll cursor left one character.
-* `l` or `right-arrow`: Scroll cursor right one character.
-* `H`: Scroll cursor left one screen-width.
-* `L`: Scroll cursor right one screen-width.
-
-* `g` or `home`: Move cursor to start of trace.
-* `G` or `end`: Move cursor to end of trace.
-
-* `t`: Move cursor to top line on screen.
-* `c`: Move cursor to center line on screen.
-* `b`: Move cursor to bottom line on screen.
-* `T`: Scroll line at cursor to top of screen.
-
-* `/`: Search forward for a pattern.
-* `?`: Search backward for a pattern.
-* `n`: Repeat the previous `/` or `?`.
-* `N`: Repeat the previous `/` or `?` in the opposite direction.
-
-After hitting `/`, the mini-editor on the bottom-most line supports the
-following hotkeys:
-* ascii characters: add the key to the pattern.
-* `Enter`: search for the pattern.
-* `Esc` or `ctrl-c`: cancel the current search, setting the screen back
-  to its state before the search.
-* `left-arrow`: move cursor left.
-* `right-arrow`: move cursor right.
-* `ctrl-a` or `home`: move cursor to start of search pattern.
-* `ctrl-e` or `end`: move cursor to end of search pattern.
-* `ctrl-u`: clear search pattern before cursor
-* `ctrl-k`: clear search pattern at and after cursor
-
-## wish list
-
-* Simple regular expression search: `.` and `*`.
-* Expand into lower depths as necessary when searching.
-* Zoom out everything.
-* Zoom out lines around the cursor to the highest (or specified) depth.
-  Maybe a number followed by `]`?
diff --git a/browse_trace/browse_trace b/browse_trace/browse_trace
deleted file mode 100755
index f80ea659..00000000
--- a/browse_trace/browse_trace
+++ /dev/null
@@ -1,7 +0,0 @@
-#!/bin/sh
-set -e
-
-cd `dirname $0`
-./build
-cd -
-`dirname $0`/browse_trace_bin $*
diff --git a/browse_trace/browse_trace.cc b/browse_trace/browse_trace.cc
deleted file mode 100644
index 76e968a7..00000000
--- a/browse_trace/browse_trace.cc
+++ /dev/null
@@ -1,553 +0,0 @@
-// Warning: zero automated tests
-
-// Includes
-#include "termbox/termbox.h"
-
-#include <stdlib.h>
-#define SIZE(X) (assert((X).size() < (1LL<<(sizeof(int)*8-2))), static_cast<int>((X).size()))
-
-#include <assert.h>
-#include <iostream>
-using std::istream;
-using std::ostream;
-using std::iostream;
-using std::cin;
-using std::cout;
-using std::cerr;
-#include <iomanip>
-#include <string.h>
-#include <string>
-using std::string;
-#include <vector>
-using std::vector;
-#include <set>
-using std::set;
-#include <sstream>
-using std::ostringstream;
-#include <fstream>
-using std::ifstream;
-using std::ofstream;
-#include <map>
-using std::map;
-#include <utility>
-using std::pair;
-// End Includes
-
-// Types
-struct trace_line {
-  string contents;
-  string label;
-  int depth;  // 0 is 'sea level'; positive integers are progressively 'deeper' and lower level
-  trace_line(string c, string l, int d) {
-    contents = c;
-    label = l;
-    depth = d;
-  }
-};
-
-struct trace_stream {
-  vector<trace_line> past_lines;
-};
-
-enum search_direction { FORWARD, BACKWARD };
-// End Types
-
-// Function prototypes are auto-generated in the 'build*' scripts; define your
-// functions in any order. Just be sure to declare each function header all on
-// one line, ending with the '{'. Our auto-generation scripts are too minimal
-// and simple-minded to handle anything else.
-#include "function_list"  // by convention, files ending with '_list' are auto-generated
-
-// from http://stackoverflow.com/questions/152643/idiomatic-c-for-reading-from-a-const-map
-template<typename T> typename T::mapped_type& get(T& map, typename T::key_type const& key) {
-  typename T::iterator iter(map.find(key));
-  assert(iter != map.end());
-  return iter->second;
-}
-template<typename T> typename T::mapped_type const& get(const T& map, typename T::key_type const& key) {
-  typename T::const_iterator iter(map.find(key));
-  assert(iter != map.end());
-  return iter->second;
-}
-template<typename T> typename T::mapped_type const& put(T& map, typename T::key_type const& key, typename T::mapped_type const& value) {
-  // map[key] requires mapped_type to have a zero-arg (default) constructor
-  map.insert(std::make_pair(key, value)).first->second = value;
-  return value;
-}
-template<typename T> bool contains_key(T& map, typename T::key_type const& key) {
-  return map.find(key) != map.end();
-}
-template<typename T> typename T::mapped_type& get_or_insert(T& map, typename T::key_type const& key) {
-  return map[key];
-}
-
-// Globals
-trace_stream* Trace_stream = NULL;
-
-ofstream Trace_file;
-int Display_row = 0;
-int Display_column = 0;
-set<int> Visible;
-int Top_of_screen = 0;
-int Left_of_screen = 0;
-int Last_printed_row = 0;
-map<int, int> Trace_index;  // screen row -> trace index
-
-string Current_search_pattern = "";
-search_direction Current_search_direction = FORWARD;
-// End Globals
-
-bool has_data(istream& in) {
-  return in && !in.eof();
-}
-
-int main(int argc, char* argv[]) {
-  if (argc != 2) {
-    cerr << "Usage: browse_trace <trace file>\n";
-    return 1;
-  }
-  load_trace(argv[1]);
-  if (!Trace_stream) return 1;
-  cerr << "computing min depth to display\n";
-  int min_depth = 9999;
-  for (int i = 0;  i < SIZE(Trace_stream->past_lines);  ++i) {
-    trace_line& curr_line = Trace_stream->past_lines.at(i);
-    if (curr_line.depth < min_depth) min_depth = curr_line.depth;
-  }
-  cerr << "min depth is " << min_depth << '\n';
-  cerr << "computing lines to display\n";
-  for (int i = 0;  i < SIZE(Trace_stream->past_lines);  ++i) {
-    if (Trace_stream->past_lines.at(i).depth == min_depth)
-      Visible.insert(i);
-  }
-  tb_init();
-  tb_clear();
-  Display_row = Display_column = 0;
-  Top_of_screen = 0;
-  refresh_screen_rows();
-  while (true) {
-    render();
-    int key = read_key();
-    if (key == 'q' || key == 'Q' || key == TB_KEY_CTRL_C) break;
-    if (key == 'j' || key == TB_KEY_ARROW_DOWN) {
-      // move cursor one line down
-      if (Display_row < Last_printed_row) ++Display_row;
-    }
-    else if (key == 'k' || key == TB_KEY_ARROW_UP) {
-      // move cursor one line up
-      if (Display_row > 0) --Display_row;
-    }
-    else if (key == 't') {
-      // move cursor to top of screen
-      Display_row = 0;
-    }
-    else if (key == 'c') {
-      // move cursor to center of screen
-      Display_row = tb_height()/2;
-      while (!contains_key(Trace_index, Display_row))
-        --Display_row;
-    }
-    else if (key == 'b') {
-      // move cursor to bottom of screen
-      Display_row = tb_height()-1;
-      while (!contains_key(Trace_index, Display_row))
-        --Display_row;
-    }
-    else if (key == 'T') {
-      // scroll line at cursor to top of screen
-      Top_of_screen = get(Trace_index, Display_row);
-      Display_row = 0;
-      refresh_screen_rows();
-    }
-    else if (key == 'h' || key == TB_KEY_ARROW_LEFT) {
-      // pan screen one character left
-      if (Left_of_screen > 0) --Left_of_screen;
-    }
-    else if (key == 'l' || key == TB_KEY_ARROW_RIGHT) {
-      // pan screen one character right
-      ++Left_of_screen;
-    }
-    else if (key == 'H') {
-      // pan screen one screen-width left
-      Left_of_screen -= (tb_width() - 5);
-      if (Left_of_screen < 0) Left_of_screen = 0;
-    }
-    else if (key == 'L') {
-      // pan screen one screen-width right
-      Left_of_screen += (tb_width() - 5);
-    }
-    else if (key == 'J' || key == TB_KEY_PGDN || key == TB_KEY_CTRL_F) {
-      // page-down
-      if (Trace_index.find(tb_height()-1) != Trace_index.end()) {
-        Top_of_screen = get(Trace_index, tb_height()-1) + 1;
-        refresh_screen_rows();
-      }
-    }
-    else if (key == 'K' || key == TB_KEY_PGUP || key == TB_KEY_CTRL_B) {
-      // page-up is more convoluted
-      for (int screen_row = tb_height();  screen_row > 0 && Top_of_screen > 0;  --screen_row) {
-        --Top_of_screen;
-        if (Top_of_screen <= 0) break;
-        while (Top_of_screen > 0 && !contains_key(Visible, Top_of_screen))
-          --Top_of_screen;
-      }
-      if (Top_of_screen >= 0)
-        refresh_screen_rows();
-    }
-    else if (key == 'g' || key == TB_KEY_HOME) {
-        Top_of_screen = 0;
-        Last_printed_row = 0;
-        Display_row = 0;
-        refresh_screen_rows();
-    }
-    else if (key == 'G' || key == TB_KEY_END) {
-      // go to bottom of screen; largely like page-up, interestingly
-      Top_of_screen = SIZE(Trace_stream->past_lines)-1;
-      for (int screen_row = tb_height();  screen_row > 0 && Top_of_screen > 0;  --screen_row) {
-        --Top_of_screen;
-        if (Top_of_screen <= 0) break;
-        while (Top_of_screen > 0 && !contains_key(Visible, Top_of_screen))
-          --Top_of_screen;
-      }
-      refresh_screen_rows();
-      // move cursor to bottom
-      Display_row = Last_printed_row;
-      refresh_screen_rows();
-    }
-    else if (key == TB_KEY_CARRIAGE_RETURN) {
-      // expand lines under current by one level
-      assert(contains_key(Trace_index, Display_row));
-      int start_index = get(Trace_index, Display_row);
-      int index = 0;
-      // simultaneously compute end_index and min_depth
-      int min_depth = 9999;
-      for (index = start_index+1;  index < SIZE(Trace_stream->past_lines);  ++index) {
-        if (contains_key(Visible, index)) break;
-        trace_line& curr_line = Trace_stream->past_lines.at(index);
-        assert(curr_line.depth > Trace_stream->past_lines.at(start_index).depth);
-        if (curr_line.depth < min_depth) min_depth = curr_line.depth;
-      }
-      int end_index = index;
-      // mark as visible all intervening indices at min_depth
-      for (index = start_index;  index < end_index;  ++index) {
-        trace_line& curr_line = Trace_stream->past_lines.at(index);
-        if (curr_line.depth == min_depth) {
-          Visible.insert(index);
-        }
-      }
-      refresh_screen_rows();
-    }
-    else if (key == TB_KEY_BACKSPACE || key == TB_KEY_BACKSPACE2) {
-      // collapse all lines under current
-      assert(contains_key(Trace_index, Display_row));
-      int start_index = get(Trace_index, Display_row);
-      int index = 0;
-      // end_index is the next line at a depth same as or lower than start_index
-      int initial_depth = Trace_stream->past_lines.at(start_index).depth;
-      for (index = start_index+1;  index < SIZE(Trace_stream->past_lines);  ++index) {
-        if (!contains_key(Visible, index)) continue;
-        trace_line& curr_line = Trace_stream->past_lines.at(index);
-        if (curr_line.depth <= initial_depth) break;
-      }
-      int end_index = index;
-      // mark as visible all intervening indices at min_depth
-      for (index = start_index+1;  index < end_index;  ++index) {
-        Visible.erase(index);
-      }
-      refresh_screen_rows();
-    }
-    else if (key == '/') {
-      if (start_search_editor(FORWARD))
-        search(Current_search_pattern, Current_search_direction);
-    }
-    else if (key == '?') {
-      if (start_search_editor(BACKWARD))
-        search(Current_search_pattern, Current_search_direction);
-    }
-    else if (key == 'n') {
-      if (!Current_search_pattern.empty())
-        search(Current_search_pattern, Current_search_direction);
-    }
-    else if (key == 'N') {
-      if (!Current_search_pattern.empty())
-        search(Current_search_pattern, opposite(Current_search_direction));
-    }
-  }
-  tb_clear();
-  tb_shutdown();
-  return 0;
-}
-
-bool start_search_editor(search_direction dir) {
-  const int bottom_screen_line = tb_height()-1;
-  // run a little editor just in the last line of the screen
-  clear_line(bottom_screen_line);
-  int col = 0;  // screen column of cursor on bottom line. also used to update pattern.
-  tb_set_cursor(col, bottom_screen_line);
-  tb_print('/', TB_WHITE, TB_BLACK);
-  ++col;
-  string pattern;
-  while (true) {
-    int key = read_key();
-    if (key == TB_KEY_ENTER) {
-      if (!pattern.empty()) {
-        Current_search_pattern = pattern;
-        Current_search_direction = dir;
-      }
-      return true;
-    }
-    else if (key == TB_KEY_ESC || key == TB_KEY_CTRL_C) {
-      return false;
-    }
-    else if (key == TB_KEY_ARROW_LEFT) {
-      if (col > /*slash*/1) {
-        --col;
-        tb_set_cursor(col, bottom_screen_line);
-      }
-    }
-    else if (key == TB_KEY_ARROW_RIGHT) {
-      if (col-/*slash*/1 < SIZE(pattern)) {
-        ++col;
-        tb_set_cursor(col, bottom_screen_line);
-      }
-    }
-    else if (key == TB_KEY_HOME || key == TB_KEY_CTRL_A) {
-      col = /*skip slash*/1;
-      tb_set_cursor(col, bottom_screen_line);
-    }
-    else if (key == TB_KEY_END || key == TB_KEY_CTRL_E) {
-      col = SIZE(pattern)+/*skip slash*/1;
-      tb_set_cursor(col, bottom_screen_line);
-    }
-    else if (key == TB_KEY_BACKSPACE || key == TB_KEY_BACKSPACE2) {
-      if (col > /*slash*/1) {
-        assert(col <= SIZE(pattern)+1);
-        --col;
-        // update pattern
-        pattern.erase(col-/*slash*/1, /*len*/1);
-        // update screen
-        tb_set_cursor(col, bottom_screen_line);
-        for (int x = col;  x < SIZE(pattern)+/*skip slash*/1;  ++x)
-          tb_print(pattern.at(x-/*slash*/1), TB_WHITE, TB_BLACK);
-        tb_print(' ', TB_WHITE, TB_BLACK);
-        tb_set_cursor(col, bottom_screen_line);
-      }
-    }
-    else if (key == TB_KEY_CTRL_K) {
-      int old_pattern_size = SIZE(pattern);
-      pattern.erase(col-/*slash*/1, SIZE(pattern) - (col-/*slash*/1));
-      tb_set_cursor(col, bottom_screen_line);
-      for (int x = col;  x < old_pattern_size+/*slash*/1;  ++x)
-        tb_print(' ', TB_WHITE, TB_BLACK);
-      tb_set_cursor(col, bottom_screen_line);
-    }
-    else if (key == TB_KEY_CTRL_U) {
-      int old_pattern_size = SIZE(pattern);
-      pattern.erase(0, col-/*slash*/1);
-      col = /*skip slash*/1;
-      tb_set_cursor(col, bottom_screen_line);
-      for (int x = /*slash*/1;  x < SIZE(pattern)+/*skip slash*/1;  ++x)
-        tb_print(pattern.at(x-/*slash*/1), TB_WHITE, TB_BLACK);
-      for (int x = SIZE(pattern)+/*slash*/1;  x < old_pattern_size+/*skip slash*/1;  ++x)
-        tb_print(' ', TB_WHITE, TB_BLACK);
-      tb_set_cursor(col, bottom_screen_line);
-    }
-    else if (key < 128) {  // ascii only
-      // update pattern
-      char c = static_cast<char>(key);
-      assert(col-1 >= 0);
-      assert(col-1 <= SIZE(pattern));
-      pattern.insert(col-/*slash*/1, /*num*/1, c);
-      // update screen
-      for (int x = col;  x < SIZE(pattern)+/*skip slash*/1;  ++x)
-        tb_print(pattern.at(x-/*slash*/1), TB_WHITE, TB_BLACK);
-      ++col;
-      tb_set_cursor(col, bottom_screen_line);
-    }
-  }
-}
-
-void search(const string& pat, search_direction dir) {
-  if (dir == FORWARD) search_next(pat);
-  else search_previous(pat);
-}
-
-search_direction opposite(search_direction dir) {
-  if (dir == FORWARD) return BACKWARD;
-  else return FORWARD;
-}
-
-void search_next(const string& pat) {
-  for (int trace_index = get(Trace_index, Display_row)+1;  trace_index < SIZE(Trace_stream->past_lines);  ++trace_index) {
-    if (!contains_key(Visible, trace_index)) continue;
-    const trace_line& line = Trace_stream->past_lines.at(trace_index);
-    if (line.label.find(pat) == string::npos && line.contents.find(pat) == string::npos) continue;
-    Top_of_screen = trace_index;
-    Display_row = 0;
-    refresh_screen_rows();
-    return;
-  }
-}
-
-void search_previous(const string& pat) {
-  for (int trace_index = get(Trace_index, Display_row)-1;  trace_index >= 0;  --trace_index) {
-    if (!contains_key(Visible, trace_index)) continue;
-    const trace_line& line = Trace_stream->past_lines.at(trace_index);
-    if (line.label.find(pat) == string::npos && line.contents.find(pat) == string::npos) continue;
-    Top_of_screen = trace_index;
-    Display_row = 0;
-    refresh_screen_rows();
-    return;
-  }
-}
-
-void clear_line(int screen_row) {
-  tb_set_cursor(0, screen_row);
-  for (int col = 0;  col < tb_width();  ++col)
-    tb_print(' ', TB_WHITE, TB_BLACK);
-  tb_set_cursor(0, screen_row);
-}
-
-// update Trace_indices for each screen_row on the basis of Top_of_screen and Visible
-void refresh_screen_rows() {
-  int screen_row = 0, index = 0;
-  Trace_index.clear();
-  for (screen_row = 0, index = Top_of_screen;  screen_row < tb_height() && index < SIZE(Trace_stream->past_lines);  ++screen_row, ++index) {
-    // skip lines without depth for now
-    while (!contains_key(Visible, index)) {
-      ++index;
-      if (index >= SIZE(Trace_stream->past_lines)) goto done;
-    }
-    assert(index < SIZE(Trace_stream->past_lines));
-    put(Trace_index, screen_row, index);
-  }
-done:;
-}
-
-void render() {
-  int screen_row = 0;
-  for (screen_row = 0;  screen_row < tb_height();  ++screen_row) {
-    if (!contains_key(Trace_index, screen_row)) break;
-    trace_line& curr_line = Trace_stream->past_lines.at(get(Trace_index, screen_row));
-    ostringstream out;
-    if (screen_row < tb_height()-1) {
-      int delta = lines_hidden(screen_row);
-      // home-brew escape sequence for red
-      if (delta > 1) {
-        if (delta > 999) out << static_cast<char>(1);
-        out << std::setw(6) << delta << "| ";
-        if (delta > 999) out << static_cast<char>(2);
-      }
-      else {
-        out << "        ";
-      }
-    }
-    else {
-      out << "        ";
-    }
-    out << std::setw(4) << curr_line.depth << ' ' << curr_line.label << ": " << curr_line.contents;
-    render_line(screen_row, out.str(), screen_row == Display_row);
-  }
-  // clear rest of screen
-  Last_printed_row = screen_row-1;
-  for (;  screen_row < tb_height();  ++screen_row)
-    render_line(screen_row, "~", /*cursor_line?*/false);
-  // move cursor back to display row at the end
-  tb_set_cursor(0, Display_row);
-}
-
-int lines_hidden(int screen_row) {
-  assert(contains_key(Trace_index, screen_row));
-  if (!contains_key(Trace_index, screen_row+1))
-    return SIZE(Trace_stream->past_lines) - get(Trace_index, screen_row);
-  else
-    return get(Trace_index, screen_row+1) - get(Trace_index, screen_row);
-}
-
-void render_line(int screen_row, const string& s, bool cursor_line) {
-  int col = 0;
-  int color = TB_WHITE;
-  int background_color = cursor_line ? /*subtle grey*/240 : TB_BLACK;
-  vector<pair<size_t, size_t> > highlight_ranges = find_all_occurrences(s, Current_search_pattern);
-  tb_set_cursor(0, screen_row);
-  for (col = 0;  col < tb_width() && col+Left_of_screen < SIZE(s);  ++col) {
-    char c = s.at(col+Left_of_screen);  // todo: unicode
-    if (c == '\n') c = ';';  // replace newlines with semi-colons
-    // escapes. hack: can't start a line with them.
-    if (c == '\1') { color = /*red*/1;  continue; }
-    if (c == '\2') { color = TB_WHITE;  continue; }
-    if (in_range(highlight_ranges, col+Left_of_screen))
-      tb_print(c, TB_BLACK, /*yellow*/11);
-    else
-      tb_print(c, color, background_color);
-  }
-  for (;  col < tb_width();  ++col)
-    tb_print(' ', TB_WHITE, background_color);
-}
-
-vector<pair<size_t, size_t> > find_all_occurrences(const string& s, const string& pat) {
-  vector<pair<size_t, size_t> > result;
-  if (pat.empty()) return result;
-  size_t idx = 0;
-  while (true) {
-    size_t next_idx = s.find(pat, idx);
-    if (next_idx == string::npos) break;
-    result.push_back(pair<size_t, size_t>(next_idx, next_idx+SIZE(pat)));
-    idx = next_idx+SIZE(pat);
-  }
-  return result;
-}
-
-bool in_range(const vector<pair<size_t, size_t> >& highlight_ranges, size_t idx) {
-  for (int i = 0;  i < SIZE(highlight_ranges);  ++i) {
-    if (idx >= highlight_ranges.at(i).first && idx < highlight_ranges.at(i).second)
-      return true;
-    if (idx < highlight_ranges.at(i).second) break;
-  }
-  return false;
-}
-
-void load_trace(const char* filename) {
-  ifstream tin(filename);
-  if (!tin) {
-    cerr << "no such file: " << filename << '\n';
-    exit(1);
-  }
-  Trace_stream = new trace_stream;
-  while (has_data(tin)) {
-    tin >> std::noskipws;
-      skip_whitespace_but_not_newline(tin);
-      if (!isdigit(tin.peek())) {
-        string dummy;
-        getline(tin, dummy);
-        continue;
-      }
-    tin >> std::skipws;
-    int depth;
-    tin >> depth;
-    string label;
-    tin >> label;
-    if (*--label.end() == ':') label.erase(--label.end());
-    string line;
-    getline(tin, line);
-    Trace_stream->past_lines.push_back(trace_line(line, label, depth));
-  }
-  cerr << "lines read: " << Trace_stream->past_lines.size() << '\n';
-}
-
-int read_key() {
-  tb_event event;
-  do {
-    tb_poll_event(&event);
-  } while (event.type != TB_EVENT_KEY);
-  return event.key ? event.key : event.ch;
-}
-
-void skip_whitespace_but_not_newline(istream& in) {
-  while (true) {
-    if (!has_data(in)) break;
-    else if (in.peek() == '\n') break;
-    else if (isspace(in.peek())) in.get();
-    else break;
-  }
-}