Add support for running Kakoune with redirected stdin

Will read to a *stdin* fifo buffer

1 files changed, 35 insertions, 0 deletions

diff --git a/src/buffer_utils.cc b/src/buffer_utils.cc
index af61cb19..7e8f3da4 100644
--- a/src/buffer_utils.cc
+++ b/src/buffer_utils.cc
@@ -1,5 +1,7 @@
 #include "buffer_utils.hh"
 
+#include "event_manager.hh"
+
 namespace Kakoune
 {
 
@@ -20,4 +22,37 @@ CharCount get_column(const Buffer& buffer,
     return col;
 }
 
+Buffer* create_fifo_buffer(String name, int fd)
+{
+    Buffer* buffer = new Buffer(std::move(name), Buffer::Flags::Fifo | Buffer::Flags::NoUndo);
+
+    auto watcher = new FDWatcher(fd, [buffer](FDWatcher& watcher) {
+        constexpr size_t buffer_size = 1024 * 16;
+        char data[buffer_size];
+        ssize_t count = read(watcher.fd(), data, buffer_size);
+        buffer->insert(buffer->end()-1, count > 0 ? String(data, data+count)
+                                                  : "*** kak: fifo closed ***\n");
+        if (count <= 0)
+        {
+            kak_assert(buffer->flags() & Buffer::Flags::Fifo);
+            buffer->flags() &= ~Buffer::Flags::Fifo;
+            buffer->flags() &= ~Buffer::Flags::NoUndo;
+            close(watcher.fd());
+            delete &watcher;
+        }
+    });
+
+    buffer->hooks().add_hook("BufClose", "",
+        [buffer, watcher](const String&, const Context&) {
+            // Check if fifo is still alive, else watcher is already dead
+            if (buffer->flags() & Buffer::Flags::Fifo)
+            {
+                close(watcher->fd());
+                delete watcher;
+            }
+        });
+
+    return buffer;
+}
+
 }