Ninja Exporter MVP

modules/ninja/_manifest.lua

@@ -0,0 +1,14 @@
+--
+-- _manifest.lua
+-- Define the ninja manifest
+-- Author: Nick Clark
+-- Copyright (c) 2025 Jess Perkins and the Premake project
+--
+
+
+return {
+	"_preload.lua",
+	"ninja.lua",
+	'ninja_cpp.lua',
+	'ninja_workspace.lua',
+}

modules/ninja/_preload.lua

@@ -0,0 +1,74 @@
+--
+-- _preload.lua
+-- Define the ninja actions
+-- Author: Nick Clark
+-- Copyright (c) 2025 Jess Perkins and the Premake project
+--
+
+local p = premake
+local project = p.project
+local getrelative = p.tools.getrelative
+
+newaction {
+	trigger     = "ninja",
+	shortname   = "Ninja",
+	description = "Generate Ninja build files",
+
+	-- Action Capabilities
+	valid_kinds     = { "ConsoleApp", "WindowedApp", "StaticLib", "SharedLib", "None" },
+	valid_languages = { "C", "C++" },
+	valid_tools = {
+		cc = {
+			"gcc",
+			"clang",
+			"msc",
+			"emcc",
+			"cosmocc",
+		}
+	},
+	toolset = (function()
+		local target = os.target()
+		if target == p.MACOSX then
+			return "clang"
+		elseif target == p.EMSCRIPTEN then
+			return "emcc"
+		elseif target == p.WINDOWS then
+			return "v143"
+		else
+			return "gcc"
+		end
+	end)(),
+
+	onInitialize = function()
+		require("ninja")
+	end,
+	onWorkspace = function(wks)
+		p.tools.getrelative = p.modules.ninja.getrelative
+		p.escaper(p.modules.ninja.esc)
+		wks.projects = table.filter(wks.projects, function(prj)
+			return p.action.supports(prj.kind) and prj.kind ~= p.NONE
+		end)
+		p.generate(wks, p.modules.ninja.getninjafilename(wks, false), p.modules.ninja.wks.generate)
+		p.tools.getrelative = getrelative
+	end,
+	onProject = function(prj)
+		p.tools.getrelative = p.modules.ninja.getrelative
+		p.escaper(p.modules.ninja.esc)
+
+		if not p.action.supports(prj.kind) or prj.kind == p.NONE then
+			return
+		end
+
+		if project.isc(prj) or project.iscpp(prj) then
+			p.oven.assignObjectSequences(prj)
+			p.generate(prj, p.modules.ninja.getprjconfigfilename(prj), p.modules.ninja.cpp.generate)
+		else
+			p.warn("Ninja does not support the '%s' language. No build file generated for project '%s'.", prj.language, prj.name)
+		end
+		p.tools.getrelative = getrelative
+	end,
+}
+
+return function(cfg)
+	return (_ACTION == "ninja")
+end

modules/ninja/ninja.lua

@@ -0,0 +1,118 @@
+--
+-- ninja.lua
+-- Utilities for generating Ninja build files
+-- Author: Nick Clark
+-- Copyright (c) 2025 Jess Perkins and the Premake project
+--
+
+local p = premake
+
+p.modules.ninja = {}
+p.modules.ninja._VERSION = p._VERSION
+
+local ninja = p.modules.ninja
+
+--
+-- Escape a string so it can be written to a Ninja build file.
+-- Ninja variables are expanded into shell commands, so we need to escape
+-- shell special characters as well as Ninja special characters.
+--
+function ninja.esc(value)
+    value = value:gsub("%$", "$$")
+    value = value:gsub(":", "$:")
+    value = value:gsub("\n", "$\n")
+    value = value:gsub(" ", "$ ")
+    value = value:gsub('%(', '\\(')
+    value = value:gsub('%)', '\\)')
+    value = value:gsub('"', '\\"')
+
+    return value
+end
+
+function ninja.header(target)
+    local kind = iif(target.project, "project", "workspace")
+    _p("# %s %s Ninja build file generated by Premake", target.name, kind)
+    _p('ninja_required_version = 1.6')
+    _p('')
+end
+
+function ninja.key(cfg)
+    local name = cfg.project.name
+    local buildcfg = cfg.buildcfg
+    if cfg.platform then
+        return name .. "_" .. (buildcfg or "") .. "_" .. cfg.platform
+    else
+        return name .. (buildcfg and ("_" .. buildcfg) or "")
+    end
+end
+
+function ninja.getprjconfigfilename(prj)
+    return prj.name .. ".ninja"
+end
+
+function ninja.getninjafilename(target, searchprjs)
+    local count = 0
+    for wks in p.global.eachWorkspace() do
+        if wks.location == target.location then
+            count = count + 1
+        end
+
+        if searchprjs then
+            for _, prj in ipairs(wks.projects) do
+                if prj.location == target.location then
+                    count = count + 1
+                end
+            end
+        end
+    end
+
+    if count == 1 then
+        return "build.ninja"
+    else
+        return target.name .. ".ninja"
+    end
+end
+
+function ninja.gettoolset(cfg)
+    local default = p.action.current().toolset
+    local toolset, version = p.tools.canonical(cfg.toolset or default)
+    if not toolset then
+        error("No toolset found for '" .. tostring(cfg.toolset) .. "'")
+    end
+    return toolset
+end
+
+function ninja.list(value)
+    if #value > 0 then
+        return " " .. table.concat(value, " ")
+    else
+        return ""
+    end
+end
+
+-- Override tools.getrelative to use workspace-relative paths for Ninja
+-- Ninja builds are always executed from the workspace root, so all paths
+-- must be relative to the workspace, not the project
+function ninja.getrelative(prj, value)
+    if type(value) == "table" then
+        local result = {}
+        for i, name in ipairs(value) do
+            result[i] = ninja.getrelative(prj, name)
+        end
+        return result
+    else
+        if value then
+            local result = value
+            if path.hasdeferredjoin(result) then
+                result = path.resolvedeferredjoin(result)
+            end
+            -- Use workspace location instead of project location for Ninja
+            return path.getrelative(prj.workspace.location, result)
+        end
+    end
+end
+
+include("ninja_cpp.lua")
+include("ninja_workspace.lua")
+
+return ninja