From 250cc7003788a51437e298f5ef416da44169b8a3 Mon Sep 17 00:00:00 2001
From: Přemysl Janouch <p.janouch@gmail.com>
Date: Fri, 27 Jan 2017 03:55:22 +0100
Subject: Pull a progress bar out of our ass

---
 hex.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/hex.c b/hex.c
index 5aa9220..7280629 100644
--- a/hex.c
+++ b/hex.c
@@ -149,6 +149,8 @@ static struct app_context
 	lua_State *L;                       ///< Lua state
 	int ref_format;                     ///< Reference to "string.format"
 	struct str_map coders;              ///< Map of coders by name
+
+	int progress;                       ///< Decoding progressbar
 #endif // HAVE_LUA
 
 	// Data:
@@ -999,9 +1001,26 @@ app_lua_chunk_newindex (lua_State *L)
 	return 0;
 }
 
+static void
+app_update_progress (int64_t real_offset)
+{
+	// Updating too often causes unnecessary slowdowns
+	int progress = real_offset * 20 / g_ctx.data_len;
+	if (progress <= g_ctx.progress)
+		return;
+
+	g_ctx.progress = progress;
+	printf ("\rDecoding... %3d%%", progress * 5);
+	fflush (stdout);
+}
+
 static void
 app_lua_mark (int64_t offset, int64_t len, const char *desc)
 {
+	// XXX: not all decoders go sequentially over the file
+	if (!g_ctx.polling && g_ctx.data_len)
+		app_update_progress (offset - g_ctx.data_offset);
+
 	// That would cause stupid entries, making trouble in marks_by_offset
 	if (len <= 0)
 		return;
@@ -2015,6 +2034,9 @@ main (int argc, char *argv[])
 		exit_fatal ("Lua: decoding failed: %s", lua_tostring (g_ctx.L, -1));
 
 	lua_pop (g_ctx.L, 1);
+
+	if (g_ctx.progress)
+		fputc ('\n', stdout);
 #endif // HAVE_LUA
 	app_flatten_marks ();
 
-- 
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