ui: rename Ui class to UrwidUserInterface

pqcli/ui/urwid/custom_progress_bar.py

@@ -0,0 +1,119 @@
+import datetime
+import typing as T
+
+import urwid
+
+
+def format_float(num: float) -> str:
+    ret = f"{num:.01f}"
+    if ret.endswith("0"):
+        ret = ret[:-2]
+    return ret
+
+
+def format_timespan(timespan: datetime.timedelta) -> str:
+    num = timespan.total_seconds()
+    if num < 60.0:
+        return f"~{int(num)}s"
+    num /= 60
+    if num < 60.0:
+        return f"~{int(num)}m"
+    num /= 60
+    if num < 24.0:
+        return f"~{format_float(num)}h"
+    num /= 24
+    return f"~{format_float(num)}d"
+
+
+class CustomProgressBar(urwid.Widget):
+    _sizing = frozenset(["flow"])
+    text_align = "center"
+    eighths = " ▏▎▍▌▋▊▉"
+
+    def __init__(self, show_time: bool) -> None:
+        self.show_time = show_time
+        self.position = 0.0
+        self.max_ = 1.0
+        self.normal = "progressbar-normal"
+        self.complete = "progressbar-done"
+        self.smooth = "progressbar-smooth"
+        self.last_tick: T.Optional[datetime.datetime, float] = None
+
+    @property
+    def time_left(self) -> T.Optional[datetime.timedelta]:
+        if self.last_tick is None:
+            return None
+        time_now = datetime.datetime.now()
+        time_then = self.last_tick[0]
+        pos_now = self.position
+        pos_then = self.last_tick[1]
+        speed = (pos_now - pos_then) / (time_now - time_then).total_seconds()
+        if not speed:
+            return None
+        return datetime.timedelta(seconds=(self.max_ - pos_now) / speed)
+
+    def set_completion(self, value: float) -> None:
+        if self.last_tick is None or value == 0:
+            self.last_tick = (datetime.datetime.now(), value)
+        self.position = value
+        self._invalidate()
+
+    def set_max(self, value: T.Union[int, float]) -> None:
+        if self.max_ == value:
+            return
+        self.last_tick = None
+        self.max_ = value
+        self._invalidate()
+
+    def reset(self, cur: float, max_: T.Union[int, float]) -> None:
+        if self.last_tick is None or cur == 0 or max_ != self.max_:
+            self.last_tick = (datetime.datetime.now(), cur)
+        self.position = cur
+        self.max_ = max_
+        self._invalidate()
+
+    def rows(self, size: T.Tuple[int, int], focus: bool = False) -> int:
+        return 1
+
+    def get_text(self) -> str:
+        percent = min(100.0, max(0.0, self.position * 100.0 / self.max_))
+        ret = f"{percent:.02f}%"
+        if self.time_left and self.show_time:
+            ret += f" ({format_timespan(self.time_left)})"
+        return ret
+
+    # workaround for https://github.com/urwid/urwid/issues/317
+    def render(self, size: T.Tuple[int, int], focus: bool = False) -> T.Any:
+        (maxcol,) = size
+        txt = urwid.Text(self.get_text(), self.text_align, "clip")
+        c = txt.render((maxcol,))
+        t = c._text[0]
+
+        cf = self.position * maxcol / self.max_
+        ccol_dirty = int(cf)
+        ccol = len(
+            c._text[0][:ccol_dirty].decode("utf-8", "ignore").encode("utf-8")
+        )
+
+        cs = 0
+        cs = int((cf - ccol) * 8)
+
+        if ccol < 0 or (ccol == 0 and cs == 0):
+            c._attr = [[(self.normal, maxcol)]]
+        elif ccol >= maxcol:
+            c._attr = [[(self.complete, maxcol)]]
+        elif cs and c._text[0][ccol] == 32:
+            t = c._text[0]
+            cenc = self.eighths[cs].encode("utf-8")
+            c._text[0] = t[:ccol] + cenc + t[ccol + 1 :]
+            a = []
+            if ccol > 0:
+                a.append((self.complete, ccol))
+            a.append((self.smooth, len(cenc)))
+            if maxcol - ccol - 1 > 0:
+                a.append((self.normal, maxcol - ccol - 1))
+            c._attr = [a]
+            c._cs = [[(None, len(c._text[0]))]]
+        else:
+            c._attr = [[(self.complete, ccol), (self.normal, maxcol - ccol)]]
+        return c