Vim script 実行時にファイル先頭からの行番号を取得したい

[ichizok]

関連: #937 #1174

Problem

関数内で現在行のファイル先頭からの行番号を取る簡便な手段がない。
Cレベルでも、実行時の行番号は :source 中しか取れない (はず) 。

Solution proposal

• ufunc_T 構造体に、定義位置の行番号を記録するフィールドを追加。
• current_SID と同じように、現在の行番号を記録する変数を追加する (current_SLN) 。

関数定義時に sourcing_lnum を記録し、関数呼び出し時に current_SLN に ufunc_T から行番号を取得することで、current_SLN + sourcing_lnum が現在行の行番号になる。
この値を返すキーを eval_vars() に追加すればよい。

その他の構造体でも同様に行番号フィールドを追加し、定義時に記録することで、map や autocmd 等で定義位置の行番号を保持できる。

vim/vim@master...ichizok:wip/script_lnum

この branch では、以下の構造体を定義して各構造体の scid_T を sctx_T に置き換えている。

typedef struct {
    scid_T	sc_scid;
    linenr_T	sc_lnum;
} sctx_T;

[ichizok]

expand('<keyname>') で現在行を取れるようにする。
キーの名前は何がいいでしょうか。

[thinca]

むずいですね。<flnum> とか? (f は file のつもり)

[tyru]

<flnum> に一票です！

[ichizok]

vim/vim@master...ichizok:wip/script_lnum
更新。

• <flnum> 実装
• :verbose set xxx? でファイル名だけでなく行番号も欲しい #1174 実装

:verbose + (set|map|autocmd|command|function) で定義位置の行数を表示

[h-east]

@ichizok
Do you have any remaining work?
Can you try suggesting to vim_dev?

[blueyed]

Thank you for working on this!

I've done a more direct route in vim/vim#3329, but thought about the same like you did here.

I would really love to have a "Source:" line in the ":profile" output, like here: https://github.com/vim/vim/pull/3329/files#diff-7837e28891d0e1dc09cd563abf114dc2R2622

[blueyed]

This will add the source to the functions in the profiling output:

diff --git i/src/userfunc.c w/src/userfunc.c
index 0831990b3..ee94c4c85 100644
--- i/src/userfunc.c
+++ w/src/userfunc.c
@@ -2609,6 +2609,9 @@ func_dump_profile(FILE *fd)
                    fprintf(fd, "FUNCTION  <SNR>%s()\n", fp->uf_name + 3);
                else
                    fprintf(fd, "FUNCTION  %s()\n", fp->uf_name);
+               fprintf(fd, "    Source: %s:%li\n",
+                       get_scriptname(fp->uf_sctx.sc_scid),
+                       fp->uf_sctx.sc_lnum);
                if (fp->uf_tm_count == 1)
                    fprintf(fd, "Called 1 time\n");
                else

[blueyed]

Have you considered the increased memory usage this will cause?
It adds 8 bytes (for long) to each sourced function, and elsewhere the line number gets stored now.

It is not that much in current times, but maybe this should be enabled explicitly, given that it is only used occasionally.

For the function's line numbers I thought about only tracking them when profiling is enabled/used.

(I have ~2k functions defined according to :func)

[blueyed]

Related vim/vim issue: vim/vim#3286

[ichizok]

@h-east @blueyed Sorry for the late reply.
No test and doc yet so I intended to send PR after adding them.
(Or first better to propose the patch and see Bram's reaction?)

Have you considered the increased memory usage this will cause?

Maybe +10kB~1MB at most. I think it is acceptable cost for the better usability:
This patch can provide users the detailed informations (the line number where option was set, map/func/autocmd/command was defined).

[blueyed]

Or first better to propose the patch and see Bram's reaction?

I would recommend that.

What do you think about my patch on top?