Add support for prompt configuration (#62)

- Create `Config` struct that is added to `Context` when initialized
- Read `~/.confg/starship.toml` during initialization (can be updated later to also look at `$XDG_CONFIG_HOME`)
- `Context` now has a method for creating modules. This allows us to provide modules with a reference to the configuration specific to that module

tests/Dockerfile

@@ -1,36 +1,46 @@
 FROM rust
 
+# Create /src as root
+RUN mkdir /src && chmod -R a+w /src
+
+# Create non-root user
+RUN useradd -ms /bin/bash nonroot
+USER nonroot
+
 # Install Node.js
 ENV NODE_VERSION 12.0.0
-ENV PATH /root/.nvm/versions/node/v$NODE_VERSION/bin:$PATH
+ENV NVM_DIR /home/nonroot/.nvm
+ENV PATH $NVM_DIR/versions/node/v$NODE_VERSION/bin:$PATH
 RUN curl https://raw.githubusercontent.com/creationix/nvm/master/install.sh | bash
 # Check that Node.js was correctly installed
 RUN node --version
 
 # Install Go
 ENV GO_VERSION 1.10.0
-ENV GOENV_ROOT /root/.goenv
+ENV GOENV_ROOT /home/nonroot/.goenv
 ENV PATH $GOENV_ROOT/bin:$GOENV_ROOT/shims:$PATH
 RUN git clone https://github.com/syndbg/goenv.git $GOENV_ROOT \
-	&& eval "$(goenv init -)" \
-	&& goenv install $GO_VERSION \
-	&& goenv global $GO_VERSION
+  && eval "$(goenv init -)" \
+  && goenv install $GO_VERSION \
+  && goenv global $GO_VERSION \
+  && chmod -R a+x $GOENV_ROOT
 # Check that Go was correctly installed
 RUN go version
 
 # Install Python
 ENV PYTHON_VERSION 3.6.8
-ENV PYENV_ROOT /root/.pyenv
+ENV PYENV_ROOT /home/nonroot/.pyenv
 ENV PATH $PYENV_ROOT/bin:$PYENV_ROOT/shims:$PATH
 RUN curl https://pyenv.run | bash \
   && pyenv install $PYTHON_VERSION \
-  && pyenv global $PYTHON_VERSION
+  && pyenv global $PYTHON_VERSION \
+  && chmod -R a+x $PYENV_ROOT
 # Check that Python was correctly installed
 RUN python --version
 
 # Create blank project
-RUN USER=root cargo new --bin starship
-WORKDIR /starship
+RUN USER=nonroot cargo new --bin /src/starship
+WORKDIR /src/starship
 
 # We want dependencies cached, so copy those first
 COPY ./Cargo.lock ./Cargo.lock
@@ -41,13 +51,8 @@ RUN mkdir benches
 RUN touch benches/my_benchmark.rs
 
 # This is a dummy build to get dependencies cached
-RUN cargo build --release
+RUN cargo build --release \
+  && rm -rf src target/debug/starship*
 
-# Delete the dummy build
-RUN rm -rf /starship
-
-# Create the directory for the real source files
-RUN mkdir starship
-WORKDIR /starship
-
-CMD ["cargo", "test", "--", "--ignored"]
+# "-Z unstable-options" is required for "--include-ignored"
+CMD ["cargo", "test", "--", "-Z", "unstable-options", "--include-ignored"]

tests/testsuite/directory.rs

@@ -67,10 +67,10 @@ fn root_directory() -> io::Result<()> {
 
 #[test]
 fn directory_in_root() -> io::Result<()> {
-    let output = common::render_module("dir").arg("--path=/tmp").output()?;
+    let output = common::render_module("dir").arg("--path=/usr").output()?;
     let actual = String::from_utf8(output.stdout).unwrap();
 
-    let expected = format!("in {} ", Color::Cyan.bold().paint("/tmp"));
+    let expected = format!("in {} ", Color::Cyan.bold().paint("/usr"));
     assert_eq!(expected, actual);
     Ok(())
 }

tests/testsuite/username.rs

@@ -7,31 +7,34 @@ use crate::common;
 // Requires mocking
 
 #[test]
-fn no_username_shown() -> io::Result<()> {
-    let expected = "";
-
-    // No environment variables
+fn no_env_variables() -> io::Result<()> {
     let output = common::render_module("username").env_clear().output()?;
     let actual = String::from_utf8(output.stdout).unwrap();
-    assert_eq!(expected, actual);
+    assert_eq!("", actual);
+    Ok(())
+}
 
-    // LOGNAME == USER
+#[test]
+fn logname_equals_user() -> io::Result<()> {
     let output = common::render_module("username")
         .env_clear()
         .env("LOGNAME", "astronaut")
         .env("USER", "astronaut")
         .output()?;
     let actual = String::from_utf8(output.stdout).unwrap();
-    assert_eq!(expected, actual);
+    assert_eq!("", actual);
+    Ok(())
+}
 
+#[test]
+fn ssh_wo_username() -> io::Result<()> {
     // SSH connection w/o username
     let output = common::render_module("username")
         .env_clear()
         .env("SSH_CONNECTION", "192.168.223.17 36673 192.168.223.229 22")
         .output()?;
     let actual = String::from_utf8(output.stdout).unwrap();
-    assert_eq!(expected, actual);
-
+    assert_eq!("", actual);
     Ok(())
 }