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local log = io.stderr
local main
function printHelp()
io.stdout:write(" \n"
.." Helper to extract essential data from a gitflow log which potentially\n"
.." is useful to write a CHANGELOG from.\n"
.." \n"
.." Options:\n"
.." \n"
.." --since <date>\n"
.." Ignore commits with this ISO date and older.\n"
.." \n"
.." --remote <str>\n"
.." Name of the git remote to use. Defaults to 'upstream'.\n"
.." \n"
.." --no-fetch\n"
.." Do NOT update refs from remote. Just use what we have local.\n"
.." \n"
)
end
function parseArgs( app )
local iA = 0
while true do iA = iA + 1
local arg = _ENV.arg[iA]
if not arg then
break
elseif arg == "--since" then
iA = iA + 1; arg = _ENV.arg[iA]
if not arg then log:write("EINVAL: --since needs value\n")return end
app.since = arg
elseif arg == "--remote" then
iA = iA + 1; arg = _ENV.arg[iA]
if not arg then log:write("EINVAL: --remote needs value\n")return end
app.remoteName = arg
elseif arg == "--no-fetch" then
app.isFetch = false
elseif arg == "--help" then
app.isHelp = true; return 0
else
log:write("EINVAL: ".. arg .."\n")return
end
end
if not app.since then log:write("EINVAL: --since missing\n")return end
if not app.remoteName then app.remoteName = "upstream" end
return 0
end
function readCommitHdr( app )
--log:write("[DEBUG] parse hdr from '".. app.fullHistory:sub(app.fullHistoryRdBeg, app.fullHistoryRdBeg+256) .."...'\n")
local f, t = app.fullHistory:find("^"
.."commit ........................................[^\n]*\n"
.."Merge: [0-9a-z]+ [0-9a-z]+\n"
.."Author: [^\n]+\n"
.."Date: [^\n]+\n"
.."\n"
, app.fullHistoryRdBeg)
if not f then f, t = app.fullHistory:find("^"
.."commit ........................................[^\n]*\n"
.."Author: [^\n]+\n"
.."Date: [^\n]+\n"
.."\n"
, app.fullHistoryRdBeg) end
if not f then
assert(app.fullHistory:len() == app.fullHistoryRdBeg-1, app.fullHistory:len()..", "..app.fullHistoryRdBeg)
app.parseFn = false
return
end
app.commitHdr = assert(app.fullHistory:sub(f, t-1))
--log:write("hdrBeginsWith '"..(app.commitHdr:sub(1, 32)).."...'\n")
app.fullHistoryRdBeg = t + 1
--log:write("hdr parsed. rdCursr now points to '".. app.fullHistory:sub(app.fullHistoryRdBeg, app.fullHistoryRdBeg+16) .."...'\n")
app.parseFn = assert(readCommitMsg)
end
function readCommitMsg( app )
local idxOfC = app.fullHistoryRdBeg
local chrPrev = false
while true do idxOfC = idxOfC + 1
local chr = app.fullHistory:byte(idxOfC)
--log:write("CHR '"..tostring(app.fullHistory:sub(idxOfC, idxOfC)).."'\n")
if (chr == 0x63) and chrPrev == 0x0A then
idxOfC = idxOfC - 1
break -- LF followed by 'c' (aka 'commit') found
elseif not chr then
idxOfC = idxOfC - 1
break
else
chrPrev = assert(chr)
end
end
local mtch = app.fullHistory:sub(app.fullHistoryRdBeg, idxOfC - 1)
assert(mtch)
while mtch:byte(mtch:len()) == 0x0A do mtch = mtch:sub(1, -2) end
mtch = mtch:gsub("\n ", "\n"):gsub("^ ", "")
app.commitMsg = mtch
app.fullHistoryRdBeg = idxOfC + 1
app.parseFn = readCommitHdr
--log:write("msg parsed. rdCursr now points to '".. app.fullHistory:sub(app.fullHistoryRdBeg, app.fullHistoryRdBeg+16) .."...'\n")
table.insert(app.commits, {
hdr = assert(app.commitHdr),
msg = assert(app.commitMsg),
})
end
function run( app )
local snk = io.stdout
if app.isFetch then
-- Make sure refs are up-to-date
local gitFetch = "git fetch \"".. app.remoteName .."\""
log:write("[DEBUG] ".. gitFetch .."\n")
local gitFetch = io.popen(gitFetch)
while true do
local buf = gitFetch:read(1<<16)
if not buf then break end
log:write(buf)
end
end
-- Collect input
local git = "git log --date-order --first-parent --decorate --since \"".. app.since.."\""
.." \"".. app.remoteName .."/master\""
.." \"".. app.remoteName .."/develop\""
log:write("[DEBUG] ".. git .."\n")
local git = io.popen(git)
while true do
local buf = git:read(1<<16)
if not buf then break end
--io.stdout:write(buf)
table.insert(app.fullHistory, buf)
end
-- Parse raw commits
app.fullHistory = table.concat(app.fullHistory)
app.parseFn = assert(readCommitHdr)
while app.parseFn do app.parseFn(app) end
-- Prepare output
local prevDate = "0000-00-00"
local version, prevVersion = "v_._._", false
local dateEntry = false
local entries = {}
for k, v in ipairs(app.commits) do
local date = assert(v.hdr:match("\nDate: +([0-9-]+) "))
local author = assert(v.hdr:match("\nAuthor: +([^\n]+)\n"))
local prNr, short = v.msg:match("Pull request #(%d+): ([^\n]+)\n")
prevVersion = version
_, version = v.hdr:match("^([^\n]+)\n"):match("tag: ([a-z]+)-([^,]+)[,)]")
if not version then version = prevVersion end
if version ~= prevVersion or not dateEntry then
if dateEntry then table.insert(entries, dateEntry) end
dateEntry = {
txt = date .." - ".. version .."\n\nResolved issues:\n\n"
}
prevDate = date
end
if prNr then
dateEntry.txt = dateEntry.txt .. short .." (PR ".. prNr ..")\n"
else
dateEntry.txt = dateEntry.txt .. v.msg .."\n"
end
end
if dateEntry then table.insert(entries, dateEntry) end
-- output
for k, v in ipairs(entries) do
snk:write("\n\n")
snk:write(v.txt)
snk:write("\n")
end
end
function main()
local app = {
since = false,
remoteName = false,
isFetch = true,
fullHistory = {},
fullHistoryRdBeg = 1,
commits = {},
parseFn = false,
}
if parseArgs(app) ~= 0 then os.exit(1) end
if app.isHelp then printHelp() return end
run(app)
end
main()
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