Replace var with const where applicable

Package.zig

@@ -33,7 +33,7 @@ pub fn fetchOneAndUnpack(
     var http_client: std.http.Client = .{ .allocator = allocator };
     defer http_client.deinit();
 
-    var global_cache_directory: std.Build.Cache.Directory = .{
+    const global_cache_directory: std.Build.Cache.Directory = .{
         .handle = try std.fs.cwd().makeOpenPath(cache_directory, .{}),
         .path = cache_directory,
     };
@@ -464,7 +464,7 @@ test "fetch and unpack" {
     var http_client: std.http.Client = .{ .allocator = alloc };
     defer http_client.deinit();
 
-    var global_cache_directory: std.Build.Cache.Directory = .{
+    const global_cache_directory: std.Build.Cache.Directory = .{
         .handle = try std.fs.cwd().makeOpenPath("test-pkg", .{}),
         .path = "test-pkg",
     };

codegen/src/main.zig

@@ -37,7 +37,7 @@ pub fn main() anyerror!void {
     try output_dir.writeFile("json.zig", json_zig);
 
     // TODO: We need a different way to handle this file...
-    var manifest_file_started = false;
+    const manifest_file_started = false;
     var manifest_file: std.fs.File = undefined;
     defer if (manifest_file_started) manifest_file.close();
     var manifest: std.fs.File.Writer = undefined;
@@ -201,7 +201,7 @@ fn processFile(file_name: []const u8, output_dir: std.fs.Dir, manifest: anytype)
     defer allocator.free(output_file_name);
     for (service_names) |name| {
         const seperator = if (output_file_name.len > 0) "-" else "";
-        var new_output_file_name = try std.fmt.allocPrint(
+        const new_output_file_name = try std.fmt.allocPrint(
             allocator,
             "{s}{s}{s}",
             .{ output_file_name, seperator, name },
@@ -211,7 +211,7 @@ fn processFile(file_name: []const u8, output_dir: std.fs.Dir, manifest: anytype)
     }
     {
         // append .zig on to the file name
-        var new_output_file_name = try std.fmt.allocPrint(
+        const new_output_file_name = try std.fmt.allocPrint(
             allocator,
             "{s}.zig",
             .{output_file_name},
@@ -337,7 +337,7 @@ fn generateServices(allocator: std.mem.Allocator, comptime _: []const u8, file:
     var generated = std.StringHashMap(void).init(allocator);
     defer generated.deinit();
 
-    var state = FileGenerationState{
+    const state = FileGenerationState{
         .shape_references = shape_references,
         .additional_types_to_generate = &unresolved,
         .additional_types_generated = &generated,
@@ -345,8 +345,8 @@ fn generateServices(allocator: std.mem.Allocator, comptime _: []const u8, file:
     };
     for (services.items) |service| {
         var sdk_id: []const u8 = undefined;
-        var version: []const u8 = service.shape.service.version;
+        const version: []const u8 = service.shape.service.version;
-        var name: []const u8 = service.name;
+        const name: []const u8 = service.name;
         var arn_namespace: []const u8 = undefined;
         var sigv4_name: []const u8 = undefined;
         var endpoint_prefix: []const u8 = undefined;

src/aws.zig

@@ -365,7 +365,7 @@ pub fn Request(comptime request_action: anytype) type {
                     .raw_parsed = .{ .raw = .{} },
                     .allocator = options.client.allocator,
                 };
-                var body_field = @field(rc.response, action.Response.http_payload);
+                const body_field = @field(rc.response, action.Response.http_payload);
                 const BodyField = @TypeOf(body_field);
                 if (BodyField == []const u8 or BodyField == ?[]const u8) {
                     expected_body_field_len = 0;
@@ -875,7 +875,7 @@ fn FullResponse(comptime action: anytype) type {
                 }
             }
             if (@hasDecl(Response, "http_payload")) {
-                var body_field = @field(self.response, Response.http_payload);
+                const body_field = @field(self.response, Response.http_payload);
                 const BodyField = @TypeOf(body_field);
                 if (BodyField == []const u8) {
                     self.allocator.free(body_field);

src/aws_credentials.zig

@@ -140,7 +140,7 @@ fn getContainerCredentials(allocator: std.mem.Allocator) !?auth.Credentials {
     var resp_payload = try std.ArrayList(u8).initCapacity(allocator, @intCast(req.response.content_length.?));
     defer resp_payload.deinit();
     try resp_payload.resize(@intCast(req.response.content_length.?));
-    var response_data = try resp_payload.toOwnedSlice();
+    const response_data = try resp_payload.toOwnedSlice();
     defer allocator.free(response_data);
     _ = try req.readAll(response_data);
     log.debug("Read {d} bytes from container credentials endpoint", .{response_data.len});
@@ -243,7 +243,7 @@ fn getImdsRoleName(allocator: std.mem.Allocator, client: *std.http.Client, imds_
         log.warn("Unexpected empty response from IMDS endpoint post token", .{});
         return null;
     }
-    var resp = try allocator.alloc(u8, @intCast(req.response.content_length.?));
+    const resp = try allocator.alloc(u8, @intCast(req.response.content_length.?));
     defer allocator.free(resp);
     _ = try req.readAll(resp);
 
@@ -296,7 +296,7 @@ fn getImdsCredentials(allocator: std.mem.Allocator, client: *std.http.Client, ro
         log.warn("Unexpected empty response from IMDS role endpoint", .{});
         return null;
     }
-    var resp = try allocator.alloc(u8, @intCast(req.response.content_length.?));
+    const resp = try allocator.alloc(u8, @intCast(req.response.content_length.?));
     defer allocator.free(resp);
     _ = try req.readAll(resp);
 
@@ -455,7 +455,7 @@ const LineIterator = struct {
     pub fn next(self: *Self) ?[]const u8 {
         if (self.inx >= self.text.len) return null;
         var current = self.inx;
-        var start = self.inx;
+        const start = self.inx;
         for (self.text[self.inx..], 0..) |c, i| {
             if (c == '\n') {
                 // log.debug("got \\n: {d}", .{i});
@@ -571,7 +571,7 @@ const EvaluatedPath = struct {
     evaluated_path: []const u8,
 };
 fn getDefaultPath(allocator: std.mem.Allocator, home_dir: ?[]const u8, dir: []const u8, file: []const u8) !EvaluatedPath {
-    var home = home_dir orelse try getHomeDir(allocator);
+    const home = home_dir orelse try getHomeDir(allocator);
     log.debug("Home directory: {s}", .{home});
     const rc = try std.fs.path.join(allocator, &[_][]const u8{ home, dir, file });
     log.debug("Path evaluated as: {s}", .{rc});

src/aws_http.zig

@@ -255,7 +255,7 @@ pub const AwsHttp = struct {
             try req.reader().readAllAlloc(self.allocator, std.math.maxInt(usize))
         else blk: {
             // content length
-            var tmp_data = try self.allocator.alloc(u8, content_length);
+            const tmp_data = try self.allocator.alloc(u8, content_length);
             errdefer self.allocator.free(tmp_data);
             _ = try req.readAll(tmp_data);
             break :blk tmp_data;

src/aws_signing.zig

@@ -364,7 +364,7 @@ fn verifyParsedAuthorization(
     const service = credential_iterator.next().?;
     const aws4_request = credential_iterator.next().?;
     if (!std.mem.eql(u8, aws4_request, "aws4_request")) return error.UnexpectedCredentialValue;
-    var config = Config{
+    const config = Config{
         .service = service,
         .credentials = credentials,
         .region = region,
@@ -444,7 +444,7 @@ fn getSigningKey(allocator: std.mem.Allocator, signing_date: []const u8, config:
         \\  region: {s}
         \\  service: {s}
     , .{ signing_date, config.region, config.service });
-    var secret = try std.fmt.allocPrint(allocator, "AWS4{s}", .{config.credentials.secret_key});
+    const secret = try std.fmt.allocPrint(allocator, "AWS4{s}", .{config.credentials.secret_key});
     defer {
         // secureZero avoids compiler optimizations that may say
         // "WTF are you doing this thing? Looks like nothing to me. It's silly and we will remove it"
@@ -716,7 +716,7 @@ fn canonicalQueryString(allocator: std.mem.Allocator, path: []const u8) ![]const
     for (sort_me.items) |i| {
         if (!first) try normalized.append('&');
         first = false;
-        var first_equals = std.mem.indexOf(u8, i, "=");
+        const first_equals = std.mem.indexOf(u8, i, "=");
         if (first_equals == null) {
             // Rare. This is "foo="
             const normed_item = try encodeUri(allocator, i);
@@ -744,7 +744,7 @@ fn canonicalQueryString(allocator: std.mem.Allocator, path: []const u8) ![]const
 }
 
 fn replace(allocator: std.mem.Allocator, haystack: []const u8, needle: []const u8, replacement_value: []const u8) ![]const u8 {
-    var buffer = try allocator.alloc(u8, std.mem.replacementSize(u8, haystack, needle, replacement_value));
+    const buffer = try allocator.alloc(u8, std.mem.replacementSize(u8, haystack, needle, replacement_value));
     _ = std.mem.replace(u8, haystack, needle, replacement_value, buffer);
     return buffer;
 }
@@ -837,7 +837,7 @@ fn canonicalHeaders(allocator: std.mem.Allocator, headers: []base.Header, servic
 
 fn canonicalHeaderValue(allocator: std.mem.Allocator, value: []const u8) ![]const u8 {
     var started = false;
-    var in_quote = false;
+    const in_quote = false;
     var start: usize = 0;
     const rc = try allocator.alloc(u8, value.len);
     var rc_inx: usize = 0;
@@ -1002,7 +1002,7 @@ test "can sign" {
     try headers.append(.{ .name = "Content-Type", .value = "application/x-www-form-urlencoded; charset=utf-8" });
     try headers.append(.{ .name = "Content-Length", .value = "13" });
     try headers.append(.{ .name = "Host", .value = "example.amazonaws.com" });
-    var req = base.Request{
+    const req = base.Request{
         .path = "/",
         .query = "",
         .body = "Param1=value1",
@@ -1071,7 +1071,7 @@ test "can verify server request" {
 
     var buf = "bar".*;
     var fis = std.io.fixedBufferStream(&buf);
-    var request = std.http.Server.Request{
+    const request = std.http.Server.Request{
         .method = std.http.Method.PUT,
         .target = "/mysfitszj3t6webstack-hostingbucketa91a61fe-1ep3ezkgwpxr0/i/am/a/teapot/foo?x-id=PutObject",
         .version = .@"HTTP/1.1",

src/date.zig

@@ -21,7 +21,7 @@ pub fn timestampToDateTime(timestamp: i64) DateTime {
     const DAY_NUMBER_ADJUSTED_1970_01_01 = 719468; //* Day number relates to March 1st */
 
     var dayN: u64 = DAY_NUMBER_ADJUSTED_1970_01_01 + unixtime / SECONDS_PER_DAY;
-    var seconds_since_midnight: u64 = unixtime % SECONDS_PER_DAY;
+    const seconds_since_midnight: u64 = unixtime % SECONDS_PER_DAY;
     var temp: u64 = 0;
 
     // Leap year rules for Gregorian Calendars
@@ -37,7 +37,7 @@ pub fn timestampToDateTime(timestamp: i64) DateTime {
 
     // dayN calculates the days of the year in relation to March 1
     var month = @as(u8, @intCast((5 * dayN + 2) / 153));
-    var day = @as(u8, @intCast(dayN - (@as(u64, @intCast(month)) * 153 + 2) / 5 + 1));
+    const day = @as(u8, @intCast(dayN - (@as(u64, @intCast(month)) * 153 + 2) / 5 + 1));
     //  153 = 31+30+31+30+31 Days for the 5 months from March through July
     //  153 = 31+30+31+30+31 Days for the 5 months from August through December
     //        31+28          Days for January and February (see below)
@@ -50,9 +50,9 @@ pub fn timestampToDateTime(timestamp: i64) DateTime {
         year += 1;
     }
 
-    var hours = @as(u8, @intCast(seconds_since_midnight / 3600));
+    const hours = @as(u8, @intCast(seconds_since_midnight / 3600));
-    var minutes = @as(u8, @intCast(seconds_since_midnight % 3600 / 60));
+    const minutes = @as(u8, @intCast(seconds_since_midnight % 3600 / 60));
-    var seconds = @as(u8, @intCast(seconds_since_midnight % 60));
+    const seconds = @as(u8, @intCast(seconds_since_midnight % 60));
 
     return DateTime{ .day = day, .month = month, .year = year, .hour = hours, .minute = minutes, .second = seconds };
 }
@@ -275,10 +275,10 @@ fn secondsBetween(start: DateTime, end: DateTime) DateTimeToTimestampError!i64 {
         return (try secondsBetween(new_start, end)) - seconds_into_start_year;
     }
     const leap_years_between = leapYearsBetween(start.year, end.year);
-    var add_days: u1 = 0;
+    const add_days: u1 = 0;
     const years_diff = end.year - start.year;
     // log.debug("Years from epoch: {d}, Leap years: {d}", .{ years_diff, leap_years_between });
-    var days_diff: i32 = (years_diff * DAYS_PER_YEAR) + leap_years_between + add_days;
+    const days_diff: i32 = (years_diff * DAYS_PER_YEAR) + leap_years_between + add_days;
     // log.debug("Days with leap year, without month: {d}", .{days_diff});
 
     const seconds_into_year = secondsFromBeginningOfYear(
@@ -306,7 +306,7 @@ fn secondsFromBeginningOfYear(year: u16, month: u8, day: u8, hour: u8, minute: u
     const normal_days_per_month: [12]u5 = .{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
     const days_per_month = if (current_year_is_leap_year) leap_year_days_per_month else normal_days_per_month;
     var current_month: usize = 1;
-    var end_month = month;
+    const end_month = month;
     var days_diff: u32 = 0;
     while (current_month != end_month) {
         days_diff += days_per_month[current_month - 1]; // months are 1-based vs array is 0-based

src/json.zig

@@ -2299,7 +2299,7 @@ pub const Parser = struct {
             },
             .ObjectValue => {
                 var object = &p.stack.items[p.stack.items.len - 2].Object;
-                var key = p.stack.items[p.stack.items.len - 1].String;
+                const key = p.stack.items[p.stack.items.len - 1].String;
 
                 switch (token) {
                     .ObjectBegin => {

src/xml.zig

@@ -260,7 +260,7 @@ const ParseContext = struct {
             begin = prev_nl + 1;
         }
 
-        var end = mem.indexOfScalarPos(u8, self.source, self.offset, '\n') orelse self.source.len;
+        const end = mem.indexOfScalarPos(u8, self.source, self.offset, '\n') orelse self.source.len;
         return self.source[begin..end];
     }
 };