Add C scanner infrastructure. #253

kevincox · 2016-10-27T23:09:56Z

This scanner allows low overhead reading of files. It can currently read
paths from an array of strings (good for ruby-based scanners) and a
terminated string (great for command executor scanners).

This also converts the find scanner and the git scanner to use the
string based infrastructure.

I'm probably going to convert the string -> Paths constructor to an FD based one. The string input is quite fast but it doesn't allow progress information or file limiting. File limiting could be done by the scanner with head but progress information would be difficult to do. It would also be faster as it can be done in parallel with the scanner itself.

If you wouldn't mind giving a general overview it would be appreciated. I'm running this right now and it appears to be working. I have tested the ruby, find and git scanners.

Highlights:

Ruby never has to parse the data (not allocations in the hot path)
Requires two allocations (backing string and matches array)
Matching requires allocations only if using the heap based approach.

TODO:

FD based rather then string based.
Max files work (error reporting)
See if I can push the wildignore filter into find (if it helps, likely not)
Code polish.

Fixes #249

kevincox · 2016-10-27T23:13:35Z

ruby/command-t/lib/command-t/scanner/file_scanner.rb

      autoload :FindFileScanner,     'command-t/scanner/file_scanner/find_file_scanner'
      autoload :GitFileScanner,      'command-t/scanner/file_scanner/git_file_scanner'
      autoload :RubyFileScanner,     'command-t/scanner/file_scanner/ruby_file_scanner'
      autoload :WatchmanFileScanner, 'command-t/scanner/file_scanner/watchman_file_scanner'

+      def self.for_string s


Did you want this to be called new?

This is fine. We could use a more descriptive word than "string" though. Maybe for_scanner_type or something like that.

kevincox · 2016-10-27T23:14:13Z

ruby/command-t/lib/command-t/scanner/file_scanner/find_file_scanner.rb

-            ]
+          Dir.chdir @path do
+            CommandT::Paths.from_string `#{command}`, terminator,
+              drop: drop, # Drop leading ./


TODO(kevincox) move this comment to the drop method.

kevincox · 2016-10-27T23:14:46Z

ruby/command-t/lib/command-t/scanner/file_scanner/find_file_scanner.rb

+          if @scan_dot_directories
+            ''
+          else
+            '-not -path "*/.*/*" '


TODO(kevincox) make sure there are tests for this.

kevincox · 2016-10-27T23:15:40Z

spec/command-t/matcher_spec.rb

@@ -6,7 +6,7 @@

 describe CommandT::Matcher do
  def matcher(*paths)
-    scanner = OpenStruct.new(:paths => paths)
+    scanner = OpenStruct.new(:c_paths => CommandT::Paths.from_array(paths))


TODO(kevincox) revert this (c_paths now does this conversion).

kevincox · 2016-10-29T14:18:31Z

Ok I like the way this looks. It relies on virtual memory to prevent reallocations and copies but I think that it will work on all modern OSes. That will need to be tested.

As for performance it is about 6x faster on my system. The most exciting part is that it is now "faster" then find $flags >/dev/null. So the scanning is no longer the bottleneck. In fact is is less the 4x slower then cat /tmp/filelist off a ramdisk so according to the numbers I remember this makes it much faster then git ls-files -c and locate.

Let me know if you have any quelms and I will try and address them.

wincent

Just gave this a superficial look over. Looks promising!

I'll give this a deeper look and start testing it locally, but in the meantime I've added some minor nit-ish feedback.

wincent · 2016-10-30T05:03:41Z

ruby/command-t/ext/command-t/match.h

+// Struct for representing a collection of matches.
+typedef struct {
+	int len;
+	match_t matches[];


nit: indent by 4 spaces.

wincent · 2016-10-30T05:04:06Z

ruby/command-t/ext/command-t/matcher.c


    thread_count = NIL_P(threads_option) ? 1 : NUM2LONG(threads_option);
    if (use_heap) {
-        heap_matches = malloc(thread_count * limit * sizeof(match_t));
+        heap_matches = malloc(sizeof(matches_t) + (thread_count*limit+1) * sizeof(match_t));


nit: spaces around the * and + operators

wincent · 2016-10-30T05:07:24Z

ruby/command-t/ext/command-t/scanner.c

+
+    long len = RARRAY_LEN(source);
+    long bufsize = sizeof(paths_t) + len * sizeof(match_t);
+    paths_t *paths = mmap(NULL, bufsize,


It relies on virtual memory to prevent reallocations and copies but I think that it will work on all modern OSes. That will need to be tested.

If we want to pre-check for the existence of mmap at build time we can add something to extconf.rb (it's going to be something like have_func or similar). But yes, we should have some fallback in place if it turns out that this isn't going to work on one of the major platforms.

I can spin up a windows VM today and try to compile vim and see if this works. If you could do the mac test it would be appreciated. This will work on the BSDs and Linux for sure.

I might have been a bit ambitious. I'm having trouble compiling even master, I probably have a borked gem development setup but I can compile json so I don't know what I'm doing wrong. Is command-t known to work on windows? If I feel brave I might give it another try tonight.

It has worked historically, but I personally haven't tested it on Windows for a long, long time (years). It's one of those things where I make a best effort to not break things, but ultimately we need a Windows-using maintainer to step forward if we want to really be on top of the Windows side, and in the absence of that then we just have to rely on user reports of stuff working (or not).

It would be nice to get some CI set up. There are free CI services for the big three platforms. Building and running the specs would help a lot even if not running vim.

wincent · 2016-10-30T05:13:09Z

ruby/command-t/lib/command-t/scanner/file_scanner/find_file_scanner.rb

+
+        def filter
+          if @wildignore
+            lambda {|p| !path_excluded? p }


nit: space after the {

wincent · 2016-10-30T05:13:23Z

ruby/command-t/lib/command-t/scanner/file_scanner/find_file_scanner.rb

+        end
+
+        def update
+           lambda {|count| progress_reporter.update count }


nit: space after the {

wincent · 2016-10-30T05:14:46Z

ruby/command-t/lib/command-t/scanner/file_scanner/git_file_scanner.rb

+              # Same in submodules
+              git submodule --quiet foreach --recursive '
+                git ls-files --exclude-standard -z |
+                  awk "-vp=$path" "BEGIN{RS=\\"\\\\0\\";ORS =\\"\\\\0\\"}\\$0=p \\"#{File::SEPARATOR}\\" \\$0"


Would be nice to add a comment somewhere near here saying what this awk incantation does.

wincent · 2016-10-30T05:15:26Z

ruby/command-t/lib/command-t/scanner/file_scanner/git_file_scanner.rb

        end

+        def scanner_failed status, result
+          return super if @nogit
+          puts status.inspect


Leftover debugging code?

wincent · 2016-10-30T05:16:47Z

ruby/command-t/lib/command-t/scanner/file_scanner.rb

      autoload :FindFileScanner,     'command-t/scanner/file_scanner/find_file_scanner'
      autoload :GitFileScanner,      'command-t/scanner/file_scanner/git_file_scanner'
      autoload :RubyFileScanner,     'command-t/scanner/file_scanner/ruby_file_scanner'
      autoload :WatchmanFileScanner, 'command-t/scanner/file_scanner/watchman_file_scanner'

+      def self.for_string s


This is fine. We could use a more descriptive word than "string" though. Maybe for_scanner_type or something like that.

wincent · 2016-10-30T05:19:03Z

ruby/command-t/ext/command-t/scanner.c

+// order matters; we want this to be evaluated only after ruby.h
+#ifdef HAVE_PTHREAD_H
+#include <pthread.h> /* for pthread_create, pthread_join etc */
+#endif


Seems like this is copy-pasta? No use of pthread_*, qsort, strncmp in this file. Haven't checked all the headers included here, but I bet many of these include statements can be deleted (heap.h, matcher.h etc).

Yup, forgot to clean that up. FIxed.

wincent · 2016-10-30T05:22:46Z

ruby/command-t/ext/command-t/scanner.c

+// Licensed under the terms of the BSD 2-clause license.
+
+#include <ruby.h>
+#include <assert.h>


kevincox · 2016-10-30T08:50:28Z

Thanks for the look over, I have fixed all your comments.

sstallion · 2016-11-16T18:22:37Z

FWIW, I'd love to see this feature added. I work in a very large code base (approx. 1GB of source) and launching command-t usually takes around 10 seconds to build the cache from git ls-files.

kevincox · 2016-11-16T21:45:37Z

Thanks @sstallion, I kept forgetting to ping this. I would be very interested if you can time the next branch as well as this patch (also let me know if it works for you :) ) as well as just whatever scanner you use piped into /dev/null.

If you aren't using the next branch I would expect most of the improvement to be from switching to it. But the should also provide some improvement over that.

sstallion · 2016-11-16T21:57:38Z

Sure thing. What's the best way to test? Normally I just interact with
Command-T inside of Vim, but if there is a way to measure the scanner
directly I'd be happy to switch and give you some results of next versus
this PR.

On Wed, Nov 16, 2016 at 3:45 PM, Kevin Cox notifications@github.com wrote:

Thanks @sstallion https://github.com/sstallion, I kept forgetting to
ping this. I would be very interested if you can time the next branch as
well as this patch (also let me know if it works for you :) ) as well as
just whatever scanner you use piped into /dev/null.

If you aren't using the next branch I would expect most of the improvement
to be from switching to it. But the should also provide some improvement
over that.

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kevincox · 2016-11-17T00:06:00Z

Just running from vim would be useful. If you want there is also a script to benchmark the scanners in the repo, the options are set by environment variables which you can see in the source (I should probably open a ticket to add some docs). This has the advantage of running a couple of times automatically and not counting the matching. As for timing to /dev/null I just meant running the commands in a shell. (for example find or git ls-files)

wincent · 2016-11-17T02:49:10Z

Just an FYI, I haven't forgotten this, but it is a fairly invasive change so wanted it to "bake" a while, with at least @kevincox running it locally, and hopefully some others. Still interested in getting this into next.

kevincox · 2016-11-17T10:45:20Z

Totally reasonable to let this settle for a bit. For an update on my usage I'm using it at work every day on a modified Ubuntu 14.04 and at home most days on Arch Linux and haven't noticed any problems.

@sstallion If you could try running it as your daily driver the testing would be much appreciated :)

sstallion · 2016-11-17T14:50:12Z

Sounds like a plan. I've been meaning to move over to next and retire my
fork anyway!

On Thu, Nov 17, 2016 at 4:45 AM, Kevin Cox notifications@github.com wrote:

Totally reasonable to let this settle for a bit. For an update on my usage
I'm using it at work every day on a modified Ubuntu 14.04 and at home most
days on Arch Linux and haven't noticed any problems.

@sstallion https://github.com/sstallion If you could try running it as
your daily driver the testing would be much appreciated :)

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sstallion · 2016-11-17T16:21:08Z

All looks well so far, but I have noticed a compiler warning:

% make
compiling ext.c
compiling heap.c
compiling match.c
compiling matcher.c
compiling scanner.c
scanner.c:83:25: warning: implicit conversion from 'long long' to 'size_t' (aka 'unsigned long')
      changes value from 1099511627776 to 0 [-Wconstant-conversion]
    size_t buffer_len = 1099511627776; // 1TiB should be enough for anyone.
           ~~~~~~~~~~   ^~~~~~~~~~~~~
1 warning generated.
compiling watchman.c
linking shared-object ext.bundle

size_t is likely the wrong type to use here (i.e. dealing with 32-bit systems). You'll either want to use an unsigned long long or a uint64_t if you need a 64-bit unsigned integer.

sstallion · 2016-11-17T16:25:08Z

In general, I'm seeing a 2-3x increase in scanning speed over next. Great work! I am however seeing some warning messages in Vim that I need to dig into. Would you be opposed to having me submit a PR to your branch to fix these issues?

sstallion · 2016-11-17T16:41:00Z

Almost forgot:

git ls-files -cz --others > /dev/null  0.09s user 0.33s system 99% cpu 0.416 total

There's still a bit of overhead. Displaying the file list takes around 2 seconds with this PR. It's much snappier and having the spinner is a nice touch - it beats staring at my terminal for 5-10 seconds at a time waiting for a refresh 👍

kevincox · 2016-11-17T16:55:11Z

@sstallion Thanks for catching that warning. I might have some work to do on a 32bit system since mmap takes a size_t so it does seem like the right type to use. I'll take a look at it or if you can submit a PR that would be great. It does sound like a real error.

Awesome, that speed improvement does look about right. Also consider that some of the overhead is from the first match (aka filter) (which is somewhat slower the subsequent matches since it does some precomputation which makes the next ones faster). Although as I say that it might be an interesting idea to move the mask generation into the scanner because then it can be done in parallel with the scanner executable. Since we are generally now speed limited by the external process this could completely hide that latency. I'll probably look into that in a future PR.

Also what OS are you running?

sstallion · 2016-11-17T17:08:00Z

Great! This was tested on OS X El Capitan. I'll start digging in - so far I've only seen a couple of trivial problems.

sstallion · 2016-11-18T23:10:27Z

This is strange. While looking into some odd behavior, I swapped back to the next branch and I'm now seeing this branch outperform this PR. What was taking 10 seconds before is now less than one. If I switch back to this PR, it goes up to about 2 seconds. Nothing in my environment has changed, which leads me to think that my initial test may not have been completely correct.

kevincox · 2016-11-19T09:00:47Z

Hmm, that's interesting. Were your original tests with a hot cache? And what about the background CPU and RAM untilization? Also are you still using the same scanner? The Ruby scanner will be much slower then this version but shouldn't have a 10x difference between here and next. Git also does some clever things with the modified timestamps of files to speed up git ls-files -o but should be the same across runs unless you are constantly mutating the files.

If you can run bin/benchmarks/scanner.rb it would be helpful, as it puts in a little effort to produce consistent numbers. However it doesn't exist on next so you will have to git checkout $pr bin/ then change the benchmark script to hardcode the scanner you want to test.

Another think is to make sure you have recompiled the library when switching branches.

I'm very interested in why your performance just jumped for the next branch "without changing anything"

This scanner allows low overhead reading of files. It can currently read paths from an array of strings (good for ruby-based scanners) and a terminated string (great for command executor scanners). This also converts the find scanner and the git scanner to use the string based infrastructure.

Takes the idea from this 2016 PR that never got merged: #253 of creating a large `mmap()`-backed allocation and having the scanner read into it from an external process. This is by no means finished yet, but I wanted to get it to the point where it runs, and it does run. Key changes to the scanner: - New `scanner_new_command()` function that takes a script command string and runs it, capturing the results. The output is stored in an `mmap()`-ed buffer, which is retained for the lifetime of the scanner. Associated `str_t` candidates also live in an `mmap()`-ed region. Their `contents` pointers point directly into the buffer, so there is no additional string copying. - The existing `scanner_new_copy()` is updated to use an `mmap()`-backed allocation as well, just for simplicity (so I don't have to maintain book-keeping data-structures for `free()`-ing `malloc()`-ed memory blocks and `munmap()`-ing `mmap()`-ed ones). I will include benchmarks here to "prove" that this doesn't seem to have had any unanticipated performance effects. - Deleted `scanner_new()` because it is was unused. As the only user of the `capacity` feature, I got rid of the `capacity` field. Because scanners use `mmap()` now, they can act as though they didn't have a capacity limit (technically, they do, but it is absurdly large and I can't see it being an issue in real workloads). - Switched from `xmalloc()` to `xcalloc()` in a couple of places to ensure the `scanner_t` struct fields all get initialized to zero. This is important so that we don't end up trying to `munmap()` uninitialized fields like `buffer` when using the `scanner_new_copy()` form of scanner. - The Watchman scanner continues to use `scanner_new_str()`, which is the non-copying version of the scanner. We don't want to call `munmap()` on those candidates, because they were allocated with `malloc(); I considered flagging this by setting `candidates_size` to zero, but given that there was no performance penalty detected by the benchmark run (see below), I opted to instead teach the Watchman scanner to use `xmap()` too. Perf delta info follows. Nothing to see here. The benchmarks use `scanner_new_copy()`, so we are indeed exercising the `mmap()`-ed code path: best avg sd +/- p (best) (avg) (sd) +/- p pathological 0.28685 0.29972 0.11067 [-0.6%] (0.28685) (0.29980) (0.11089) [-1.4%] command-t 0.23675 0.24726 0.08370 [-0.1%] (0.23675) (0.24759) (0.08559) [-1.2%] chromium (subset) 1.63047 1.64562 0.10958 [+0.7%] 0.05 (0.42029) (0.43740) (0.19917) [+2.4%] chromium (whole) 1.88771 1.90492 0.09161 [+0.1%] (0.30267) (0.31403) (0.07257) [+1.6%] big (400k) 2.91391 2.95510 0.14608 [+0.2%] (0.45750) (0.47420) (0.07242) [+0.8%] total 6.96067 7.05262 0.29309 [+0.2%] (1.70912) (1.77301) (0.28325) [+0.7%] Differences from the PR: - That one leans heavily on Ruby-level stuff (ie. both in the calling code, and in the C layer) whereas this one is "pure" C. For example, the `popen` call in the PR is made from Ruby, and lots of Ruby values are passed back and forth. There are calls back into the Ruby layer to do filtering that are not implemented here (and I rather like the idea of keep things in "pure" C, so they never be). - There are lots of features in the PR that aren't implemented yet (and again, I haven't decided when/if I will implement them): things like control over the max files count, ability to pass in a `drop` value to skip over entries, ability to specify the field separator character etc.

To reflect indirect contribution referenced in the parent commit. Cross-referencing again: #253

wincent · 2022-07-16T09:33:55Z

Just to "close" the loop here after many years 🤦, over on the pu branch I've been working on a basically from-scratch Command-T rewrite:

Targeting Neovim exclusively instead of Vim.
Plug-in code in Lua instead of Vimscript.
C library is pure POSIX with no references to Ruby VM, or even Lua.
Instead of calling in to C from Ruby, we call into C from LuaJIT using the FFI.

The basic idea is to reset the whole thing onto some more modern underpinnings. Compatibility with Windows or Vim, for example, aren't on the priority list at this stage — just getting the thing to work for simple cases is the focus (without necessarily even many configuration options; I just want to pick some "reasonable defaults" and see them work first).

My C is super rusty at this point (although it is becoming less so as I proceed with the rewrite), and while it is far from finished, it is showing a nice performance boost already. I started by porting the core matching/scoring code, then I ported the Watchman scanner. The numbers showed a roughly 2x speed-up on some of the metrics, even though the performance critical sections were still only going from C to C. Last night, I took the initial steps towards implementing the "C scanner infrastructure" proposed in this PR; I haven't tested it rigorously yet, and it doesn't have all the features or configuration options, but it works well enough to be considered a "blinking light" demo at least. This PR obviously won't apply to pu because the basis is drastically different (in addition to porting from "Ruby C" to POSIX C", I have done quite a bit of "clean up" and restructuring along the way), but what I did bring across is the idea of mmap()-ing a large slab and read()-ing into from an external process.

Here are some matcher numbers (I haven't set up scanner benchmarks yet, but I will). As always, CPU time is rendered without parens, wall-clock time (the actually interesting time) is rendered with parens. So, for example, we see average wall clock time for the "big" dataset go from 0.66s in Ruby to 0.47s in Lua. A smaller dataset like the "command-t" one goes from 0.48s in Ruby to 0.24s in Lua. The "pathological" dataset goes from 0.54s to 0.29s etc.

Ruby (`main`)

                    best    avg      sd     +/-   p   (best)    (avg)      (sd)     +/-   p
     pathological 0.53443 0.54394 0.00720 [-1.1%]   (0.53443) (0.54404) (0.00728) [-1.2%]
        command-t 0.47690 0.48567 0.00358 [-0.4%]   (0.47690) (0.48569) (0.00359) [-0.5%]
chromium (subset) 1.97640 1.98757 0.00640 [-0.1%]   (0.48688) (0.48923) (0.00199) [-0.3%]
 chromium (whole) 2.70771 2.72148 0.01165 [-0.4%]   (0.42343) (0.43254) (0.00931) [-3.1%]
       big (400k) 4.27406 4.31385 0.04007 [-0.4%]   (0.64053) (0.66157) (0.02466) [-1.5%]

Lua (`pu`)

                    best    avg      sd     +/-     p    (best)    (avg)      (sd)     +/-   p
     pathological 0.28685 0.29972 0.11067 [-0.6%]      (0.28685) (0.29980) (0.11089) [-1.4%]
        command-t 0.23675 0.24726 0.08370 [-0.1%]      (0.23675) (0.24759) (0.08559) [-1.2%]
chromium (subset) 1.63047 1.64562 0.10958 [+0.7%] 0.05 (0.42029) (0.43740) (0.19917) [+2.4%]
 chromium (whole) 1.88771 1.90492 0.09161 [+0.1%]      (0.30267) (0.31403) (0.07257) [+1.6%]
       big (400k) 2.91391 2.95510 0.14608 [+0.2%]      (0.45750) (0.47420) (0.07242) [+0.8%]
            total 6.96067 7.05262 0.29309 [+0.2%]      (1.70912) (1.77301) (0.28325) [+0.7%]

Next steps

pu is still a long way from being finished or usable; it builds, and you can test the scanning and the matching, but I haven't even built a proper UI for selecting results yet. So my next steps are going to be tidying a lots of loose ends (TODOs sprinkled all over the place), getting the UI to the point where you can actually use the Lua-powered version as a replacement for the Ruby-powered one, and then slowly evaluating which additional features/settings to bring forward. This PR is never going to see pu itself, but I still wanted to thank you, @kevincox, for submitting it — the ideas in the PR may live on in a new form, even if the original patch does not!

kevincox · 2022-07-16T10:28:11Z

That is exciting 🎉

As for this patch I no longer work with a large repo so have stopped using it myself. So I'll close it, of course the code will be archived in case it is interesting to anyone.

If you want a second pair of eyes on the new patch feel free to ask for a review. But I'm afraid my C is growing rusty as well these days.

Takes the idea from this 2016 PR that never got merged: wincent/command-t#253 of creating a large `mmap()`-backed allocation and having the scanner read into it from an external process. This is by no means finished yet, but I wanted to get it to the point where it runs, and it does run. Key changes to the scanner: - New `scanner_new_command()` function that takes a script command string and runs it, capturing the results. The output is stored in an `mmap()`-ed buffer, which is retained for the lifetime of the scanner. Associated `str_t` candidates also live in an `mmap()`-ed region. Their `contents` pointers point directly into the buffer, so there is no additional string copying. - The existing `scanner_new_copy()` is updated to use an `mmap()`-backed allocation as well, just for simplicity (so I don't have to maintain book-keeping data-structures for `free()`-ing `malloc()`-ed memory blocks and `munmap()`-ing `mmap()`-ed ones). I will include benchmarks here to "prove" that this doesn't seem to have had any unanticipated performance effects. - Deleted `scanner_new()` because it is was unused. As the only user of the `capacity` feature, I got rid of the `capacity` field. Because scanners use `mmap()` now, they can act as though they didn't have a capacity limit (technically, they do, but it is absurdly large and I can't see it being an issue in real workloads). - Switched from `xmalloc()` to `xcalloc()` in a couple of places to ensure the `scanner_t` struct fields all get initialized to zero. This is important so that we don't end up trying to `munmap()` uninitialized fields like `buffer` when using the `scanner_new_copy()` form of scanner. - The Watchman scanner continues to use `scanner_new_str()`, which is the non-copying version of the scanner. We don't want to call `munmap()` on those candidates, because they were allocated with `malloc(); I considered flagging this by setting `candidates_size` to zero, but given that there was no performance penalty detected by the benchmark run (see below), I opted to instead teach the Watchman scanner to use `xmap()` too. Perf delta info follows. Nothing to see here. The benchmarks use `scanner_new_copy()`, so we are indeed exercising the `mmap()`-ed code path: best avg sd +/- p (best) (avg) (sd) +/- p pathological 0.28685 0.29972 0.11067 [-0.6%] (0.28685) (0.29980) (0.11089) [-1.4%] command-t 0.23675 0.24726 0.08370 [-0.1%] (0.23675) (0.24759) (0.08559) [-1.2%] chromium (subset) 1.63047 1.64562 0.10958 [+0.7%] 0.05 (0.42029) (0.43740) (0.19917) [+2.4%] chromium (whole) 1.88771 1.90492 0.09161 [+0.1%] (0.30267) (0.31403) (0.07257) [+1.6%] big (400k) 2.91391 2.95510 0.14608 [+0.2%] (0.45750) (0.47420) (0.07242) [+0.8%] total 6.96067 7.05262 0.29309 [+0.2%] (1.70912) (1.77301) (0.28325) [+0.7%] Differences from the PR: - That one leans heavily on Ruby-level stuff (ie. both in the calling code, and in the C layer) whereas this one is "pure" C. For example, the `popen` call in the PR is made from Ruby, and lots of Ruby values are passed back and forth. There are calls back into the Ruby layer to do filtering that are not implemented here (and I rather like the idea of keep things in "pure" C, so they never be). - There are lots of features in the PR that aren't implemented yet (and again, I haven't decided when/if I will implement them): things like control over the max files count, ability to pass in a `drop` value to skip over entries, ability to specify the field separator character etc.

To reflect indirect contribution referenced in the parent commit. Cross-referencing again: wincent/command-t#253

kevincox commented Oct 27, 2016

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kevincox force-pushed the c-scanner branch 2 times, most recently from 1cb57a4 to a51f3ce Compare October 29, 2016 13:57

kevincox force-pushed the c-scanner branch 3 times, most recently from d1e7f4c to cc6610f Compare October 29, 2016 15:54

kevincox changed the title ~~[WIP] Add C scanner infrastructure.~~ Add C scanner infrastructure. Oct 29, 2016

wincent reviewed Oct 30, 2016

View reviewed changes

kevincox force-pushed the c-scanner branch from cc6610f to 33c293c Compare October 30, 2016 08:49

kevincox force-pushed the c-scanner branch 2 times, most recently from 493d853 to 3249756 Compare October 30, 2016 12:14

kevincox force-pushed the c-scanner branch from 3249756 to 5ec4b0b Compare November 19, 2016 09:24

kevincox mentioned this pull request Dec 18, 2016

Custom command #258

Closed

kevincox mentioned this pull request Jun 18, 2017

Improve matching performance. #293

Closed

wincent mentioned this pull request Oct 26, 2017

Add new file scanner: rg (ripgrep) #313

Closed

wincent added a commit that referenced this pull request Jul 16, 2022

docs: update AUTHORS section

e423ca8

To reflect indirect contribution referenced in the parent commit. Cross-referencing again: #253

kevincox closed this Jul 16, 2022

Padmamanickam added a commit to Padmamanickam/command-t that referenced this pull request Feb 6, 2023

docs: update AUTHORS section

4666bca

To reflect indirect contribution referenced in the parent commit. Cross-referencing again: wincent/command-t#253

Add C scanner infrastructure. #253

Add C scanner infrastructure. #253

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kevincox commented Oct 30, 2016

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wincent commented Jul 16, 2022

Ruby (main)

Lua (pu)

Next steps

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Ruby (`main`)

Lua (`pu`)