Add script to compute PRs git logs to CHANGES.md format

Replace PRlogs_to_RELEASE_format.py with changes.lua

changes.lua: Add an option to choose remote + set origin as default remote

changes.lua: Simplify sort

changes.lua: Fix regex matching author name

scripts/changes.lua

@@ -0,0 +1,85 @@
+---
+-- Output a list of merged PRs since last release in the CHANGES.txt format
+---
+
+local format_separator = "||"
+
+local git_command_raw = 'git log '..
+						'%s/master "^%s/release" '..
+						'--merges --first-parent '..
+						'--pretty="%%s%s%%b" '..
+						'--grep="Merge pull request #"'
+
+local changes_pr_format = "* PR #%s %s (@%s)"
+
+local function parse_log(line)
+    change = {}
+    for chunk in line:gmatch(string.format("[^%s]+", format_separator)) do
+    	table.insert(change, chunk)
+    end
+    assert(#change == 2)
+
+    local _, _, pr_num = change[1]:find("%s#([%d]+)%s")
+    local _, _, pr_author = change[1]:find("from%s([^/]+)")
+    local pr_desc = change[2]
+
+    return {
+    	number = tonumber(pr_num),
+    	author = pr_author,
+    	description = pr_desc
+	}
+end
+
+local function gather_changes()
+	local git_command = git_command_raw:format(_OPTIONS["remote"], _OPTIONS["remote"], format_separator)
+	local output = os.outputof(git_command)
+
+	changes = {}
+
+	for line in output:gmatch("[^\r\n]+") do
+		table.insert(changes, parse_log(line))
+	end
+
+	return changes
+end
+
+local function format_to_changes(changes)
+
+	changes_copy = changes
+	local function compare_changes(a, b)
+		return a.number < b.number
+	end
+	table.sort(changes, compare_changes)
+
+	for _, change in pairs(changes_copy) do
+		print(string.format(changes_pr_format, change.number, change.description, change.author))
+	end
+end
+
+local function generate_changes()
+	changes = gather_changes()
+
+	format_to_changes(changes)
+end
+
+newaction {
+	trigger = "changes",
+	description = "Generate a file containing merged pull requests in CHANGES.txt format",
+	execute = generate_changes
+}
+
+newoption {
+   trigger     = "remote",
+   value       = "remoteName",
+   description = "Git remote to operate on.",
+   default     = "origin",
+}
+
+---
+-- Check the command line arguments, and show some help if needed.
+---
+	local usage = 'usage is: --file=<path to this scripts/changes.lua> changes'
+
+	if #_ARGS ~= 0 then
+		error(usage, 0)
+	end