From 389fe57a9fcd4c9971bb9cebc8dfeb67cac6498a Mon Sep 17 00:00:00 2001
From: Adam Harrison <adamdharrison@gmail.com>
Date: Tue, 5 Mar 2024 12:22:07 -0500
Subject: Flush input buffer before prompt.

---
 src/lpm.c   | 11 +++++++++++
 src/lpm.lua |  1 +
 2 files changed, 12 insertions(+)

(limited to 'src')

diff --git a/src/lpm.c b/src/lpm.c
index ba228a9..17054e4 100644
--- a/src/lpm.c
+++ b/src/lpm.c
@@ -8,6 +8,7 @@
   #include <sys/socket.h>
   #include <arpa/inet.h>
   #include <libgen.h>
+  #include <termios.h>
 
   #define MAX_PATH PATH_MAX
 #endif
@@ -155,6 +156,15 @@ static int lpm_hash(lua_State* L) {
   return 1;
 }
 
+static int lpm_tcflush(lua_State* L) {
+  int stream = luaL_checkinteger(L, 1);
+  #ifndef _WIN32
+    if (isatty(stream))
+      tcflush(stream, TCIOFLUSH);
+  #endif
+  return 0;
+}
+
 
 static int lpm_symlink(lua_State* L) {
   #ifndef _WIN32
@@ -1279,6 +1289,7 @@ static const luaL_Reg system_lib[] = {
   { "mkdir",     lpm_mkdir },    // Makes a directory.
   { "rmdir",     lpm_rmdir },    // Removes a directory.
   { "hash",      lpm_hash  },    // Returns a hex sha256 hash.
+  { "tcflush",   lpm_tcflush },  // Flushes an terminal stream.
   { "symlink",   lpm_symlink },  // Creates a symlink.
   { "chmod",     lpm_chmod },    // Chmod's a file.
   { "init",      lpm_init },     // Initializes a git repository with the specified remote.
diff --git a/src/lpm.lua b/src/lpm.lua
index 5307a0a..c990407 100644
--- a/src/lpm.lua
+++ b/src/lpm.lua
@@ -524,6 +524,7 @@ local function log_progress_action(message)
   end
 end
 local function prompt(message)
+  system.tcflush(0)
   if not ASSUME_YES or not JSON then
     io.stderr:write(colorize(message .. " [Y/n]: ", "cyan"))
     if ASSUME_YES then io.stderr:write("Y\n") end
-- 
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