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Smarter algorithm to patch files list 

New algorithm use the fact that files list are always
sorted to optimize the table's insertions and removals.
This commit is contained in:
Francesco Abbate 2021-07-25 00:14:21 +02:00
parent 1ecb016453
commit b49422ab02
1 changed files with 28 additions and 17 deletions
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43
data/core/init.lua
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@ -248,11 +248,16 @@ function core.scan_project_subdir(dirname, filename)
end
end
-- for "a" inclusive from i1 + 1 and i2
local function files_list_match(a, i1, i2, b)
if i2 - i1 ~= #b then return false end
for i = 1, #b do
if a[i1 + i].filename ~= b[i].filename or a[i1 + i].type ~= b[i].type then
local function files_info_equal(a, b)
return a.filename == b.filename and a.type == b.type
end
-- for "a" inclusive from i1 + 1 and i1 + n
local function files_list_match(a, i1, n, b)
if n ~= #b then return false end
for i = 1, n do
if not files_info_equal(a[i1 + i], b[i]) then
return false
end
end
@ -260,16 +265,22 @@ local function files_list_match(a, i1, i2, b)
end
-- arguments like for files_list_match
local function files_list_replace(a, i1, i2, b)
local nmin = math.min(i2 - i1, #b)
for i = 1, nmin do
a[i1 + i] = b[i]
local function files_list_replace(as, i1, n, bs)
local m = #bs
local i, j = 1, 1
while i <= m or i <= n do
local a, b = as[i1 + i], bs[j]
if i > n or (j <= m and not files_info_equal(a, b) and
not system.path_compare(a.filename, a.type, b.filename, b.type))
then
table.insert(as, i1 + i, b)
i, j, n = i + 1, j + 1, n + 1
elseif j > m or system.path_compare(a.filename, a.type, b.filename, b.type) then
table.remove(as, i1 + i)
n = n - 1
else
i, j = i + 1, j + 1
end
for j = 1, i2 - i1 - nmin do
table.remove(a, i1 + nmin + 1)
end
for j = 1, #b - nmin do
table.insert(a, i1 + nmin + j, b[nmin + j])
end
end
@ -293,8 +304,8 @@ local function rescan_project_subdir(dir, filename_rooted)
end
end
if not files_list_match(dir.files, index, index + n, new_files) then
files_list_replace(dir.files, index, index + n, new_files)
if not files_list_match(dir.files, index, n, new_files) then
files_list_replace(dir.files, index, n, new_files)
dir.is_dirty = true
return true
end