From e239b66691200163c1983b645c28b34825f32ea4 Mon Sep 17 00:00:00 2001
From: Leo Tenenbaum <pommicket@gmail.com>
Date: Thu, 18 Feb 2021 12:23:28 -0500
Subject: :build working on windows

---
 build.c         | 17 +++++++++++------
 process-posix.c |  2 +-
 process-win.c   | 44 ++++++++++++++++++++++++++++++++++++++++----
 3 files changed, 52 insertions(+), 11 deletions(-)

diff --git a/build.c b/build.c
index e0cf2be..60cd70f 100644
--- a/build.c
+++ b/build.c
@@ -45,17 +45,22 @@ static void build_start(Ted *ted) {
 	if (cargo) {
 		program = "cargo";
 		argv[0] = "build";
+	} else if (fs_file_exists("make.bat")) {
+		program = "make.bat";
 	} else {
 		program = "make";
 	}
 #endif
 
-	process_exec(&ted->build_process, program, argv);
-	ted->building = true;
-	ted->build_shown = true;
-	buffer_new_file(&ted->build_buffer, NULL);
-	ted->build_buffer.store_undo_events = false; // don't need undo events for build output buffer
-	ted->build_buffer.view_only = true;
+	if (process_exec(&ted->build_process, program, argv)) {
+		ted->building = true;
+		ted->build_shown = true;
+		buffer_new_file(&ted->build_buffer, NULL);
+		ted->build_buffer.store_undo_events = false; // don't need undo events for build output buffer
+		ted->build_buffer.view_only = true;
+	} else {
+		ted_seterr("Couldn't start build: %s", process_geterr(&ted->build_process));
+	}
 }
 
 static void build_stop(Ted *ted) {
diff --git a/process-posix.c b/process-posix.c
index 9be7e10..6434f6e 100644
--- a/process-posix.c
+++ b/process-posix.c
@@ -43,7 +43,7 @@ bool process_exec(Process *proc, char const *program, char **argv) {
 }
 
 char const *process_geterr(Process *p) {
-	return p->error;
+	return *p->error ? p->error : NULL;
 }
 
 long long process_read(Process *proc, char *data, size_t size) {
diff --git a/process-win.c b/process-win.c
index a2f97d4..95f3fbe 100644
--- a/process-win.c
+++ b/process-win.c
@@ -3,6 +3,7 @@
 struct Process {
 	HANDLE pipe_read, pipe_write;
 	PROCESS_INFORMATION process_info;
+	char error[64];
 };
 
 bool process_exec(Process *process, char const *program, char **argv) {
@@ -32,31 +33,66 @@ bool process_exec(Process *process, char const *program, char **argv) {
 			process->pipe_read = pipe_read;
 			process->pipe_write = pipe_write;
 			success = true;
+		} else {
+			strbuf_printf(process->error, "Couldn't create process (error code %u)", (unsigned)GetLastError());
 		}
 		if (!success) {
 			CloseHandle(pipe_read);
 			CloseHandle(pipe_write);
 		}
+	} else {
+		strbuf_printf(process->error, "Couldn't create pipe (error code %u)", (unsigned)GetLastError());
 	}
 	return success;
 }
 
+char const *process_geterr(Process *p) {
+	return *p->error ? p->error : NULL;
+}
+
 long long process_read(Process *process, char *data, size_t size) {
 	DWORD bytes_read = 0, bytes_avail = 0, bytes_left = 0;
 	if (PeekNamedPipe(process->pipe_read, data, (DWORD)size, &bytes_read, &bytes_avail, &bytes_left)) {
-		if (bytes_read == 0)
+		if (bytes_read == 0) {
 			return -1;
-		else
+		} else {
+			ReadFile(process->pipe_read, data, (DWORD)size, &bytes_read, NULL); // make sure data is removed from pipe
 			return bytes_read;
+		}
 	} else {
-		return -2;	
+		strbuf_printf(process->error, "Couldn't read from pipe (error code %u)", (unsigned)GetLastError());
+		return -2;
 	}
 }
 
 void process_kill(Process *process) {
-	// @TODO: kill process
+	TerminateProcess(process->process_info.hProcess, 1);
 	CloseHandle(process->pipe_read);
 	CloseHandle(process->pipe_write);
 	CloseHandle(process->process_info.hProcess);
 	CloseHandle(process->process_info.hThread);
+}
+
+int process_check_status(Process *process, char *message, size_t message_size) {
+	HANDLE hProcess = process->process_info.hProcess;
+	DWORD exit_code = 1;
+	if (GetExitCodeProcess(hProcess, &exit_code)) {
+		if (exit_code == STILL_ACTIVE) {
+			return 0;
+		} else {
+			process_kill(process);
+			if (exit_code == 0) {
+				str_printf(message, message_size, "exited successfully");
+				return +1;
+			} else {
+				str_printf(message, message_size, "exited with code %d", (int)exit_code);
+				return -1;
+			}
+		}
+	} else {
+		// something has gone wrong.
+		str_printf(message, message_size, "couldn't get process exit status");
+		process_kill(process);
+		return -1;
+	}
 }
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