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Add support for parallel fetching of Git submodules (#784)

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Git v2.8 introduced support for parallel fetching of submodules. This
can result in a substantial performance boost when performing a "git
submodule update" in a repository with many submodules, potentially
further magnified when updating submodules recursively.

This commit introduces a check on the Git version to see if it supports
parallel submodule fetching. If it does, we add the '--jobs=N' argument
to our call to "git submodule update", where N is g:plug_threads or the
vim-plug default of 16.
This commit is contained in:
Samuel D. Leslie 2018-09-06 15:48:54 +10:00 committed by Junegunn Choi
parent 0a255ee62d
commit 8ed2617ba0
1 changed files with 3 additions and 1 deletions
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plug.vim
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@ -1011,6 +1011,8 @@ function! s:update_impl(pull, force, args) abort
let s:clone_opt .= ' -c core.eol=lf -c core.autocrlf=input'
endif
let s:submodule_opt = s:git_version_requirement(2, 8) ? ' --jobs='.threads : ''
" Python version requirement (>= 2.7)
if python && !has('python3') && !ruby && !use_job && s:update.threads > 1
redir => pyv
@ -1102,7 +1104,7 @@ function! s:update_finish()
if !v:shell_error && filereadable(spec.dir.'/.gitmodules') &&
\ (s:update.force || has_key(s:update.new, name) || s:is_updated(spec.dir))
call s:log4(name, 'Updating submodules. This may take a while.')
let out .= s:bang('git submodule update --init --recursive 2>&1', spec.dir)
let out .= s:bang('git submodule update --init --recursive'.s:submodule_opt.' 2>&1', spec.dir)
endif
let msg = s:format_message(v:shell_error ? 'x': '-', name, out)
if v:shell_error