std.fmt: breaking API changes

added adapter to AnyWriter and GenericWriter to help bridge the gap
between old and new API

make std.testing.expectFmt work at compile-time

std.fmt no longer has a dependency on std.unicode. Formatted printing
was never properly unicode-aware. Now it no longer pretends to be.

Breakage/deprecations:
* std.fs.File.reader -> std.fs.File.deprecatedReader
* std.fs.File.writer -> std.fs.File.deprecatedWriter
* std.io.GenericReader -> std.io.Reader
* std.io.GenericWriter -> std.io.Writer
* std.io.AnyReader -> std.io.Reader
* std.io.AnyWriter -> std.io.Writer
* std.fmt.format -> std.fmt.deprecatedFormat
* std.fmt.fmtSliceEscapeLower -> std.ascii.hexEscape
* std.fmt.fmtSliceEscapeUpper -> std.ascii.hexEscape
* std.fmt.fmtSliceHexLower -> {x}
* std.fmt.fmtSliceHexUpper -> {X}
* std.fmt.fmtIntSizeDec -> {B}
* std.fmt.fmtIntSizeBin -> {Bi}
* std.fmt.fmtDuration -> {D}
* std.fmt.fmtDurationSigned -> {D}
* {} -> {f} when there is a format method
* format method signature
  - anytype -> *std.io.Writer
  - inferred error set -> error{WriteFailed}
  - options -> (deleted)
* std.fmt.Formatted
  - now takes context type explicitly
  - no fmt string

1 files changed, 7 insertions, 7 deletions

diff --git a/lib/std/Build/Step/WriteFile.zig b/lib/std/Build/Step/WriteFile.zig
index 29fba1c871..b1cfb3b42a 100644
--- a/lib/std/Build/Step/WriteFile.zig
+++ b/lib/std/Build/Step/WriteFile.zig
@@ -217,7 +217,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
         const src_dir_path = dir.source.getPath3(b, step);
 
         var src_dir = src_dir_path.root_dir.handle.openDir(src_dir_path.subPathOrDot(), .{ .iterate = true }) catch |err| {
-            return step.fail("unable to open source directory '{}': {s}", .{
+            return step.fail("unable to open source directory '{f}': {s}", .{
                 src_dir_path, @errorName(err),
             });
         };
@@ -258,7 +258,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
     write_file.generated_directory.path = try b.cache_root.join(arena, &.{ "o", &digest });
 
     var cache_dir = b.cache_root.handle.makeOpenPath(cache_path, .{}) catch |err| {
-        return step.fail("unable to make path '{}{s}': {s}", .{
+        return step.fail("unable to make path '{f}{s}': {s}", .{
             b.cache_root, cache_path, @errorName(err),
         });
     };
@@ -269,7 +269,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
     for (write_file.files.items) |file| {
         if (fs.path.dirname(file.sub_path)) |dirname| {
             cache_dir.makePath(dirname) catch |err| {
-                return step.fail("unable to make path '{}{s}{c}{s}': {s}", .{
+                return step.fail("unable to make path '{f}{s}{c}{s}': {s}", .{
                     b.cache_root, cache_path, fs.path.sep, dirname, @errorName(err),
                 });
             };
@@ -277,7 +277,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
         switch (file.contents) {
             .bytes => |bytes| {
                 cache_dir.writeFile(.{ .sub_path = file.sub_path, .data = bytes }) catch |err| {
-                    return step.fail("unable to write file '{}{s}{c}{s}': {s}", .{
+                    return step.fail("unable to write file '{f}{s}{c}{s}': {s}", .{
                         b.cache_root, cache_path, fs.path.sep, file.sub_path, @errorName(err),
                     });
                 };
@@ -291,7 +291,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
                     file.sub_path,
                     .{},
                 ) catch |err| {
-                    return step.fail("unable to update file from '{s}' to '{}{s}{c}{s}': {s}", .{
+                    return step.fail("unable to update file from '{s}' to '{f}{s}{c}{s}': {s}", .{
                         source_path,
                         b.cache_root,
                         cache_path,
@@ -315,7 +315,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
 
         if (dest_dirname.len != 0) {
             cache_dir.makePath(dest_dirname) catch |err| {
-                return step.fail("unable to make path '{}{s}{c}{s}': {s}", .{
+                return step.fail("unable to make path '{f}{s}{c}{s}': {s}", .{
                     b.cache_root, cache_path, fs.path.sep, dest_dirname, @errorName(err),
                 });
             };
@@ -338,7 +338,7 @@ fn make(step: *Step, options: Step.MakeOptions) !void {
                         dest_path,
                         .{},
                     ) catch |err| {
-                        return step.fail("unable to update file from '{}' to '{}{s}{c}{s}': {s}", .{
+                        return step.fail("unable to update file from '{f}' to '{f}{s}{c}{s}': {s}", .{
                             src_entry_path, b.cache_root, cache_path, fs.path.sep, dest_path, @errorName(err),
                         });
                     };