importctl: draw a pretty progress bar while downloading

Everybody loves pretty terminal progress bar.

src/test/meson.build

@@ -380,6 +380,10 @@ executables += [
                 'sources' : files('test-process-util.c'),
                 'dependencies' : threads,
         },
+        test_template + {
+                'sources' : files('test-progress-bar.c'),
+                'type' : 'manual',
+        },
         test_template + {
                 'sources' : files('test-qrcode-util.c'),
                 'dependencies' : libdl,

src/test/test-locale-util.c

@@ -92,6 +92,8 @@ TEST(dump_special_glyphs) {
         dump_glyph(SPECIAL_GLYPH_TREE_SPACE);
         dump_glyph(SPECIAL_GLYPH_TREE_TOP);
         dump_glyph(SPECIAL_GLYPH_VERTICAL_DOTTED);
+        dump_glyph(SPECIAL_GLYPH_HORIZONTAL_DOTTED);
+        dump_glyph(SPECIAL_GLYPH_HORIZONTAL_FAT);
         dump_glyph(SPECIAL_GLYPH_TRIANGULAR_BULLET);
         dump_glyph(SPECIAL_GLYPH_BLACK_CIRCLE);
         dump_glyph(SPECIAL_GLYPH_WHITE_CIRCLE);

src/test/test-progress-bar.c

@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "pretty-print.h"
+#include "random-util.h"
+#include "tests.h"
+
+#define PROGRESS_PREFIX "test: "
+
+TEST(progress_bar) {
+
+        draw_progress_bar(PROGRESS_PREFIX, 0);
+
+        bool paused = false;
+
+        for (double d = 0; d <= 100; d += 0.5) {
+                usleep_safe(random_u64_range(20 * USEC_PER_MSEC));
+                draw_progress_bar(PROGRESS_PREFIX, d);
+
+                if (!paused && d >= 50) {
+                        clear_progress_bar(PROGRESS_PREFIX);
+                        fputs("Sleeping for 1s...", stdout);
+                        fflush(stdout);
+                        usleep_safe(USEC_PER_SEC);
+                        paused = true;
+                }
+        }
+
+        draw_progress_bar(PROGRESS_PREFIX, 100);
+        usleep_safe(300 * MSEC_PER_SEC);
+        clear_progress_bar(PROGRESS_PREFIX);
+        fputs("Done.\n", stdout);
+}
+
+DEFINE_TEST_MAIN(LOG_INFO);