update build instructions

README.md

@@ -1112,46 +1112,81 @@ If everything goes well, four `ttf` files will appear in `./out`.
 
 ### How to package Powerlevel10k for distribution?
 
-If you want to package Powerlevel10k, it's best to do it based off releases. In a nutshell, you
-need to download Powerlevel10k tarball, build gitstatusd and compile zsh files.
+If you want to package Powerlevel10k, it's best to do it based off [releases](
+  https://github.com/romkatv/powerlevel10k/releases).
 
-The following code should work. If it doesn't, please open an issue.
+The following code should work without patching anything in Powerlevel10k sources. If it doesn't,
+please open an issue.
 
 **IMPORTANT:** *Change version to what you want to package. This example doesn't get updated when
 new versions are released.*
 
 ```zsh
-curl -fsSLO https://github.com/romkatv/powerlevel10k/archive/v1.8.0.tar.gz
-tar -xzf v1.8.0.tar.gz
-cd powerlevel10k-1.8.0
-(
-  cd gitstatus
-  . ./build.info
-  curl -fsSLo                              \
-    deps/libgit2-"$libgit2_version".tar.gz \
-    https://github.com/romkatv/libgit2/archive/"$libgit2_version".tar.gz
-  ./build
-  rm deps/libgit2-*.tar.gz
-)
+# Download and extract Powerlevel10k tarball.
+powerlevel10k_version=1.8.2  # IMPORTANT: CHANGE VERSION TO WHAT YOU WANT
+wget https://github.com/romkatv/powerlevel10k/archive/v"$powerlevel10k_version".tar.gz
+tar -xzf v"$powerlevel10k_version".tar.gz
+cd powerlevel10k-"$powerlevel10k_version"
+
+# Download libgit2 tarball and compile gitstatusd.
+./gitstatus/build -w
+
+# Post-process.
+rm ./gitstatus/deps/libgit2-*.tar.gz
 for file in *.zsh-theme internal/*.zsh gitstatus/*.zsh gitstatus/install; do
   zsh -fc "emulate zsh -o no_aliases && zcompile -R -- $file.zwc $file"
 done
 ```
 
-This needs binutils, cmake, gcc, g++, git, GNU make and zsh.
-
-Depending on your workflow, it might be easier to store the URL to the libgit2 tarball in the
-same place where you are going to put the main powerlevel10k tarball URL. You'll need to update both
-URLs at the same time when bumping package version.
+This needs binutils, cmake, gcc, g++, git, GNU make, wget, zsh and either shasum or sha256sum.
 
 Once build completes, *do not delete or move any files*. Package the whole directory as is. Don't
-add it (or any of its subdirectories) to `PATH`.
+add the directory or any of its subdirectories to `PATH`.
+
+You probably don't want to build in docker, so don't pass `-d` to `./gitstatus/build`.
+
+gitstatus depends on a [custom fork of libgit2](https://github.com/romkatv/libgit2/). When you run
+`./gitstatus/build -w`, it'll automatically download the appropriate libgit2 tarball and verify its
+sha256. If you want to separate the downloading of source tarballs from compilation, you can
+download the libgit2 tarball manually and invoke `./gitstatus/build` without `-w`.
+
+```zsh
+# Download and extract Powerlevel10k tarball.
+powerlevel10k_version=1.8.2  # IMPORTANT: CHANGE VERSION TO WHAT YOU WANT
+wget https://github.com/romkatv/powerlevel10k/archive/v"$powerlevel10k_version".tar.gz
+tar -xzf v"$powerlevel10k_version".tar.gz
+cd powerlevel10k-"$powerlevel10k_version"
+
+# Download libgit2 tarball and place it where ./gitstatus/build expects it.
+. ./gitstatus/build.info
+libgit2_path=./gitstatus/deps/libgit2-"$libgit2_version".tar.gz
+libgit2_url=https://github.com/romkatv/libgit2/archive/"$libgit2_version".tar.gz
+wget -O "$libgit2_path" "$libgit2_url"
+
+# Compile gitstatusd.
+./gitstatus/build
+
+# Post-process.
+rm ./gitstatus/deps/libgit2-*.tar.gz
+for file in *.zsh-theme internal/*.zsh gitstatus/*.zsh gitstatus/install; do
+  zsh -fc "emulate zsh -o no_aliases && zcompile -R -- $file.zwc $file"
+done
+```
 
-Note that Powerlevel10k has an embedded version of gitstatus. It must stay that way. The embedded
-gitstatus won't conflict with the standalone version. They can have different versions and can
-coexist within the same Zsh process. Do not attempt to surgically remove gitstatus from
-Powerlevel10k, package the result and then somehow force Powerlevel10k to use a separately packaged
-gitstatus.
+Note that the URL and the content of the libgit2 tarball are fully defined by the main Powerlevel10k
+tarball. Thus, you can set URLs and sha256 checksums of the two tarball in the same place (package
+definition) and update them at the same time when bumping package version. In other words, you don't
+have to extract `libgit2_version` programmatically. You can manually copy it from [build.info](
+  https://github.com/romkatv/powerlevel10k/blob/master/gitstatus/build.info) to your package
+definition, if you prefer.
+
+Powerlevel10k has an embedded version of [gitstatus](https://github.com/romkatv/gitstatus). It must
+stay that way. If you decide to package both of them, follow the respective instructions from each
+project. The embedded gitstatus in Powerlevel10k won't conflict with the standalone gitstatus. They
+can have different versions and can coexist within the same Zsh process. Do not attempt to
+surgically remove gitstatus from Powerlevel10k, package the result and then force Powerlevel10k to
+use a separately packaged gitstatus. Instead, treat Powerlevel10k and gitstatus as independent
+projects that don't depend on each other.
 
 ## Troubleshooting