From 4a49b39159b11278341cc26ba051a0f595ac43f8 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Mon, 22 Jul 2019 22:15:06 -0300
Subject: [PATCH 1/4] make magickSave edit Image.curpath

---
 src/magick.zig | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/src/magick.zig b/src/magick.zig
index 0c770f7..e75fd3d 100644
--- a/src/magick.zig
+++ b/src/magick.zig
@@ -45,35 +45,36 @@ fn magickLoad(image: *Image) !MagickContext {
     return mctx;
 }
 
-fn magickSave(image: *Image, mctx: *MagickContext) !void {
-    var tmpnam = try images.temporaryName(image.allocator);
-    defer image.allocator.free(tmpnam);
+fn magickSave(image: *Image, wand: *mc.MagickWand) !void {
+    const allocator = image.allocator;
 
-    var c_tmpnam = try std.cstr.addNullByte(image.allocator, tmpnam);
-    defer image.allocator.free(c_tmpnam);
+    var tmpnam = try images.temporaryName(allocator);
+    var c_tmpnam = try std.cstr.addNullByte(allocator, tmpnam);
+    defer allocator.free(c_tmpnam);
 
-    std.debug.warn(
-        "\tmagick: saving from '{}' to '{}'\n",
-        image.curpath,
-        c_tmpnam,
-    );
+    std.debug.warn("\tmagick: saving to '{}'..", c_tmpnam);
 
-    if (mc.MagickWriteImage(mctx.wand, c_tmpnam.ptr) != 1)
+    _ = mc.MagickDisplayImage(wand, c":0");
+
+    if (mc.MagickWriteImage(wand, c_tmpnam.ptr) != 1)
         return error.MagickWriteFail;
+
+    image.curpath = tmpnam;
+    std.debug.warn("OK\n");
 }
 
 pub fn runRotate(image: *Image) !void {
     var mctx = try magickLoad(image);
     defer mctx.deinit();
 
-    var bg = mc.NewPixelWand().?;
+    var bg = mc.NewPixelWand();
     defer mc.DestroyPixelWand(bg);
 
-    if (mc.PixelSetColor(bg, c"#ffffff") != 1)
+    if (mc.PixelSetColor(bg, c"#000000") != 1)
         return error.PixelSetColorFail;
 
-    if (mc.MagickRotateImage(mctx.wand, bg, 30) != 1)
+    if (mc.MagickRotateImage(mctx.wand, bg, f64(30)) != 1)
         return error.RotateFail;
 
-    try magickSave(image, &mctx);
+    try magickSave(image, mctx.wand);
 }

From f9aa226d9e391cdc9029d8fb9743d65eabfea263 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Mon, 22 Jul 2019 22:22:01 -0300
Subject: [PATCH 3/4] add proper arguments to rotate cmd

---
 examples/rotate.scri |  2 +-
 src/magick.zig       | 10 +++++-----
 src/runner.zig       | 17 ++++++++++++++---
 3 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/examples/rotate.scri b/examples/rotate.scri
index 0b934c6..acde24d 100644
--- a/examples/rotate.scri
+++ b/examples/rotate.scri
@@ -1,3 +1,3 @@
 load :0;
-rotate 30;
+rotate 30 #ff00ff;
 quicksave;
diff --git a/src/magick.zig b/src/magick.zig
index e75fd3d..7effc94 100644
--- a/src/magick.zig
+++ b/src/magick.zig
@@ -54,8 +54,6 @@ fn magickSave(image: *Image, wand: *mc.MagickWand) !void {
 
     std.debug.warn("\tmagick: saving to '{}'..", c_tmpnam);
 
-    _ = mc.MagickDisplayImage(wand, c":0");
-
     if (mc.MagickWriteImage(wand, c_tmpnam.ptr) != 1)
         return error.MagickWriteFail;
 
@@ -63,17 +61,19 @@ fn magickSave(image: *Image, wand: *mc.MagickWand) !void {
     std.debug.warn("OK\n");
 }
 
-pub fn runRotate(image: *Image) !void {
+/// Rotate the given image.
+/// bgfill must point to a null-terminated string.
+pub fn runRotate(image: *Image, deg: f32, bgfill: []const u8) !void {
     var mctx = try magickLoad(image);
     defer mctx.deinit();
 
     var bg = mc.NewPixelWand();
     defer mc.DestroyPixelWand(bg);
 
-    if (mc.PixelSetColor(bg, c"#000000") != 1)
+    if (mc.PixelSetColor(bg, bgfill.ptr) != 1)
         return error.PixelSetColorFail;
 
-    if (mc.MagickRotateImage(mctx.wand, bg, f64(30)) != 1)
+    if (mc.MagickRotateImage(mctx.wand, bg, deg) != 1)
         return error.RotateFail;
 
     try magickSave(image, mctx.wand);
diff --git a/src/runner.zig b/src/runner.zig
index 2eeb5f7..f669e9e 100644
--- a/src/runner.zig
+++ b/src/runner.zig
@@ -258,9 +258,16 @@ pub const Runner = struct {
         try image.runCustomPlugin(custom.WildNoise, pos, map);
     }
 
-    fn rotateCmd(self: *Runner) !void {
+    fn rotateCmd(
+        self: *Runner,
+        deg: f32,
+        bgfill: []const u8,
+    ) !void {
         var image = try self.getImage();
-        try magick.runRotate(image);
+        var c_bgfill = try std.cstr.addNullByte(self.allocator, bgfill);
+        defer self.allocator.free(c_bgfill);
+
+        try magick.runRotate(image, deg, c_bgfill);
     }
 
     fn runCommand(self: *Runner, cmd: *lang.Command) !void {
@@ -424,7 +431,11 @@ pub const Runner = struct {
                 try self.wildNoiseCmd(pos, &map);
             },
 
-            .Rotate => try self.rotateCmd(),
+            .Rotate => blk: {
+                const deg = try cmd.floatArgAt(0);
+                const bgfill = try cmd.argAt(1);
+                try self.rotateCmd(deg, bgfill);
+            },
 
             else => blk: {
                 std.debug.warn("Unsupported command: {}\n", cmd.command);

From c128960451ef24511d55f5332ed5fa7afc01e1e6 Mon Sep 17 00:00:00 2001
From: Luna <git@l4.pm>
Date: Mon, 22 Jul 2019 22:27:00 -0300
Subject: [PATCH 4/4] add rotate command to docs

---
 doc/README.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/doc/README.md b/doc/README.md
index d03424b..3620102 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -159,9 +159,11 @@ Parameters:
  - `repeat_bytes`, Amount of bytes to preload with random data and repeat
     throughout the image slice
 
-## TODO `echo split index delay`
+## `rotate deg bgfill`
 
-Run an echo filter on the given loaded file.
+Rotate the image by `deg` degrees, filling the resulting triangles with `bgfill`.
+
+`bgfill` is a hex string, e.g `#000000`.
 
 ## `quicksave`