diff options
| author | equa <equaa@protonmail.com> | 2022-03-08 22:04:55 +0000 |
|---|---|---|
| committer | equa <equaa@protonmail.com> | 2022-03-08 22:12:23 +0000 |
| commit | 55e859929479050e2a3b71a614a388f3b6c2a197 (patch) | |
| tree | 95ebc1638c229dd8409ba56054a8f48b2fa4f533 /fs.lua | |
| parent | 224e8f43c50a513bae78af2152c12c0a5f9564f9 (diff) | |
basic editor watcher, soon to be several editors
Diffstat (limited to 'fs.lua')
| -rw-r--r-- | fs.lua | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/fs.lua b/fs.lua index 2e7638f..153e611 100644 --- a/fs.lua +++ b/fs.lua @@ -1,5 +1,7 @@ -- cqueue filesystem with luaposix -- TODO: closing files +-- TODO: error handling. right now it *always* returns errno instead of +-- throwing it, which may be what we want. code depends on this local unistd = require("posix.unistd") local cqueues = require("cqueues") local dkjson = require("dkjson") @@ -85,8 +87,9 @@ function try_read(buffer, fd, max) local data, _, errno = unistd.read(fd, max) if not data then return nil, errno end + if #data == 0 then return nil end - table.insert(buffer, { data = data, index = 1}) + table.insert(buffer, { data = data, index = 1 }) return #data end @@ -96,7 +99,7 @@ function file.read(f, what) if (type(what) == "number" and what > 0) then while buffer_length(f.rbuf) < what do - if try_read(f.rbuf, f.pollfd, what - buffer_length(f.rbuf)) == 0 then + if not try_read(f.rbuf, f.pollfd, what - buffer_length(f.rbuf)) then break end end @@ -104,13 +107,14 @@ function file.read(f, what) return buffer_get(f.rbuf, math.min(what, buffer_length(f.rbuf))) elseif (type(what) == "number" and what < 0) then while buffer_length(f.rbuf) == 0 do - if try_read(f.rbuf, f.pollfd, 0 - what) == 0 then return nil end + if not try_read(f.rbuf, f.pollfd, 0 - what) then return nil end end return buffer_get(f.rbuf, math.min(0 - what, buffer_length(f.rbuf))) elseif what == "*l" or what == "*L" then while not buffer_char_index(f.rbuf, "\n") do -- TODO: constantize this - if try_read(f.rbuf, f.pollfd, 1024) == 0 then + local x = try_read(f.rbuf, f.pollfd, 1024) + if not x then break end end @@ -125,6 +129,7 @@ function file.read(f, what) "\n", (what == "*l" and "" or "\n") ) + return ret else -- TODO @@ -140,7 +145,7 @@ function file.write(f, data) while index <= #data do cqueues.poll({ pollfd = f.pollfd, events = function () return "w" end }) local nb, _, errno = unistd.write(f.pollfd, string.sub(data, index)) - if nb >= 0 then + if nb then index = index + nb else return nil, errno -- TODO? @@ -150,4 +155,8 @@ function file.write(f, data) return f end +function file.close(f) + cqueues.cancel(f.pollfd) +end + return file |