From 8d4afad4f6a608e10fd6749d08c47e2aa39d57a1 Mon Sep 17 00:00:00 2001
From: LordMZTE <lord@mzte.de>
Date: Sun, 28 May 2023 01:16:15 +0200
Subject: [PATCH] add command to copy current buffer

---
 mzte-nv/conf/lua/settings.fnl |  6 ++-
 mzte-nv/src/main.zig          |  2 +
 mzte-nv/src/modules/cpbuf.zig | 70 +++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+), 1 deletion(-)
 create mode 100644 mzte-nv/src/modules/cpbuf.zig

diff --git a/mzte-nv/conf/lua/settings.fnl b/mzte-nv/conf/lua/settings.fnl
index 811e56a..6d22b76 100644
--- a/mzte-nv/conf/lua/settings.fnl
+++ b/mzte-nv/conf/lua/settings.fnl
@@ -1,7 +1,11 @@
+(local mztenv (require :mzte_nv))
 (local cmd vim.cmd)
 
+;; CPBuf command
+(vim.api.nvim_create_user_command :CPBuf mztenv.cpbuf.copyBuf {:nargs 0})
+
 ;; Compile commands
-(let [compile-path (. (require :mzte_nv) :compile :compilePath)
+(let [compile-path mztenv.compile.compilePath
       make-cmd vim.api.nvim_create_user_command]
   (make-cmd :CompileConfig
             #(compile-path (.. (vim.fn.getenv :HOME) :/.config/nvim)) {:nargs 0})
diff --git a/mzte-nv/src/main.zig b/mzte-nv/src/main.zig
index 59e8a00..7190c28 100644
--- a/mzte-nv/src/main.zig
+++ b/mzte-nv/src/main.zig
@@ -10,6 +10,7 @@ pub const version = "1.2.0";
 const modules = struct {
     const cmp = @import("modules/cmp.zig");
     const compile = @import("modules/compile.zig");
+    const cpbuf = @import("modules/cpbuf.zig");
     const jdtls = @import("modules/jdtls.zig");
     const tsn_actions = @import("modules/tsn_actions.zig");
     const utils = @import("modules/utils.zig");
@@ -64,6 +65,7 @@ export fn luaopen_mzte_nv(l_: ?*c.lua_State) c_int {
         .onInit = ffi.luaFunc(lOnInit),
         .cmp = modules.cmp,
         .compile = modules.compile,
+        .cpbuf = modules.cpbuf,
         .jdtls = modules.jdtls,
         .tsn_actions = modules.tsn_actions,
         .utils = modules.utils,
diff --git a/mzte-nv/src/modules/cpbuf.zig b/mzte-nv/src/modules/cpbuf.zig
new file mode 100644
index 0000000..522af59
--- /dev/null
+++ b/mzte-nv/src/modules/cpbuf.zig
@@ -0,0 +1,70 @@
+const std = @import("std");
+const nvim = @import("nvim");
+const znvim = @import("znvim");
+const ffi = @import("../ffi.zig");
+const ser = @import("../ser.zig");
+const c = ffi.c;
+
+pub fn luaPush(l: *c.lua_State) void {
+    ser.luaPushAny(l, .{
+        .copyBuf = ffi.luaFunc(lCopyBuf),
+    });
+}
+
+fn lCopyBuf(l: *c.lua_State) !c_int {
+    _ = l;
+    // create new buffer
+    const newbuf = nvim.buflist_new(null, null, 0, nvim.BLN_LISTED | nvim.BLN_NEW) orelse
+        return error.Buffer;
+
+    // close in case of error
+    errdefer _ = nvim.close_buffer(null, newbuf, 0, false, false);
+
+    // create memline
+    if (nvim.ml_open(newbuf) == nvim.FAIL)
+        return error.Buffer;
+
+    // copy lines
+    var lnum: i32 = 1;
+    while (lnum < nvim.curbuf.*.b_ml.ml_line_count) : (lnum += 1) {
+        const line = nvim.ml_get_buf(nvim.curbuf, lnum, false) orelse return error.Buffer;
+        if (nvim.ml_append_buf(newbuf, lnum - 1, line, 0, false) == nvim.FAIL)
+            return error.Buffer;
+    }
+
+    // get previous filetype
+    var ft_numval: i64 = 0;
+    var ft_stringval: ?[*:0]u8 = null;
+    if (nvim.get_option_value_strict(
+        @constCast("filetype"),
+        &ft_numval,
+        &ft_stringval,
+        nvim.SREQ_BUF,
+        nvim.curbuf,
+    ) == nvim.FAIL)
+        return error.Buffer;
+
+    // activate buffer
+    if (nvim.do_buffer(
+        nvim.DOBUF_GOTO,
+        nvim.DOBUF_FIRST,
+        nvim.FORWARD,
+        newbuf.*.handle,
+        0,
+    ) == nvim.FAIL)
+        return error.Buffer;
+
+    // set new filetype
+    if (nvim.set_option_value("filetype", 0, ft_stringval, nvim.OPT_LOCAL)) |_|
+        return error.Buffer;
+
+    // apply autocmds
+    _ = nvim.apply_autocmds(nvim.EVENT_BUFREADPOST, @constCast("cpbuf"), null, false, nvim.curbuf);
+    _ = nvim.apply_autocmds(nvim.EVENT_BUFWINENTER, @constCast("cpbuf"), null, false, nvim.curbuf);
+
+
+    // ensure redraw
+    nvim.redraw_curbuf_later(nvim.UPD_NOT_VALID);
+
+    return 0;
+}