1 files changed, 188 insertions, 0 deletions
diff --git a/src/bat_utils/config.rs b/src/bat_utils/config.rs
new file mode 100644
index 00000000..fa19b8d3
--- /dev/null
+++ b/src/bat_utils/config.rs
@@ -0,0 +1,188 @@
+// Based on code from https://github.com/sharkdp/bat v0.17.1 (6d981498d80aa0127df9547ec0ac69d8314b29e5)
+// See src/bat_utils/LICENSE
+
+use std::env;
+use std::ffi::OsString;
+use std::fs;
+use std::io::{self, Write};
+use std::path::PathBuf;
+
+use crate::directories::PROJECT_DIRS;
+
+pub fn make_syntax_mapping() {
+    // From bat/src/bin/bat/app.rs
+    let mut syntax_mapping = SyntaxMapping::builtin();
+
+    if let Some(values) = self.matches.values_of("map-syntax") {
+        for from_to in values {
+            let parts: Vec<_> = from_to.split(':').collect();
+
+            if parts.len() != 2 {
+                return Err("Invalid syntax mapping. The format of the -m/--map-syntax option is '<glob-pattern>:<syntax-name>'. For example: '*.cpp:C++'.".into());
+            }
+
+            syntax_mapping.insert(parts[0], MappingTarget::MapTo(parts[1]))?;
+        }
+    }
+}
+
+pub fn config_file() -> PathBuf {
+    env::var("BAT_CONFIG_PATH")
+        .ok()
+        .map(PathBuf::from)
+        .filter(|config_path| config_path.is_file())
+        .unwrap_or_else(|| PROJECT_DIRS.config_dir().join("config"))
+}
+
+pub fn generate_config_file() -> bat::error::Result<()> {
+    let config_file = config_file();
+    if config_file.exists() {
+        println!(
+            "A config file already exists at: {}",
+            config_file.to_string_lossy()
+        );
+
+        print!("Overwrite? (y/N): ");
+        io::stdout().flush()?;
+        let mut decision = String::new();
+        io::stdin().read_line(&mut decision)?;
+
+        if !decision.trim().eq_ignore_ascii_case("Y") {
+            return Ok(());
+        }
+    } else {
+        let config_dir = config_file.parent();
+        match config_dir {
+            Some(path) => fs::create_dir_all(path)?,
+            None => {
+                return Err(format!(
+                    "Unable to write config file to: {}",
+                    config_file.to_string_lossy()
+                )
+                .into());
+            }
+        }
+    }
+
+    let default_config = r#"# This is `bat`s configuration file. Each line either contains a comment or
+# a command-line option that you want to pass to `bat` by default. You can
+# run `bat --help` to get a list of all possible configuration options.
+
+# Specify desired highlighting theme (e.g. "TwoDark"). Run `bat --list-themes`
+# for a list of all available themes
+#--theme="TwoDark"
+
+# Enable this to use italic text on the terminal. This is not supported on all
+# terminal emulators (like tmux, by default):
+#--italic-text=always
+
+# Uncomment the following line to disable automatic paging:
+#--paging=never
+
+# Uncomment the following line if you are using less version >= 551 and want to
+# enable mouse scrolling support in `bat` when running inside tmux. This might
+# disable text selection, unless you press shift.
+#--pager="less --RAW-CONTROL-CHARS --quit-if-one-screen --mouse"
+
+# Syntax mappings: map a certain filename pattern to a language.
+#   Example 1: use the C++ syntax for .ino files
+#   Example 2: Use ".gitignore"-style highlighting for ".ignore" files
+#--map-syntax "*.ino:C++"
+#--map-syntax ".ignore:Git Ignore"
+"#;
+
+    fs::write(&config_file, default_config)?;
+    println!(
+        "Success! Config file written to {}",
+        config_file.to_string_lossy()
+    );
+
+    Ok(())
+}
+
+pub fn get_args_from_config_file() -> Result<Vec<OsString>, shell_words::ParseError> {
+    Ok(fs::read_to_string(config_file())
+        .ok()
+        .map(|content| get_args_from_str(&content))
+        .transpose()?
+        .unwrap_or_else(Vec::new))
+}
+
+pub fn get_args_from_env_var() -> Option<Result<Vec<OsString>, shell_words::ParseError>> {
+    env::var("BAT_OPTS").ok().map(|s| get_args_from_str(&s))
+}
+
+fn get_args_from_str(content: &str) -> Result<Vec<OsString>, shell_words::ParseError> {
+    let args_per_line = content
+        .split('\n')
+        .map(|line| line.trim())
+        .filter(|line| !line.is_empty())
+        .filter(|line| !line.starts_with('#'))
+        .map(|line| shell_words::split(line))
+        .collect::<Result<Vec<_>, _>>()?;
+
+    Ok(args_per_line
+        .iter()
+        .flatten()
+        .map(|line| line.into())
+        .collect())
+}
+
+#[test]
+fn empty() {
+    let args = get_args_from_str("").unwrap();
+    assert!(args.is_empty());
+}
+
+#[test]
+fn single() {
+    assert_eq!(vec!["--plain"], get_args_from_str("--plain").unwrap());
+}
+
+#[test]
+fn multiple() {
+    assert_eq!(
+        vec!["--plain", "--language=cpp"],
+        get_args_from_str("--plain --language=cpp").unwrap()
+    );
+}
+
+#[test]
+fn quotes() {
+    assert_eq!(
+        vec!["--theme", "Sublime Snazzy"],
+        get_args_from_str("--theme \"Sublime Snazzy\"").unwrap()
+    );
+}
+
+#[test]
+fn multi_line() {
+    let config = "
+    -p
+    --style numbers,changes
+
+    --color=always
+    ";
+    assert_eq!(
+        vec!["-p", "--style", "numbers,changes", "--color=always"],
+        get_args_from_str(config).unwrap()
+    );
+}
+
+#[test]
+fn comments() {
+    let config = "
+    # plain style
+    -p
+
+    # show line numbers and Git modifications
+    --style numbers,changes
+
+    # Always show ANSI colors
+    --color=always
+    ";
+    assert_eq!(
+        vec!["-p", "--style", "numbers,changes", "--color=always"],
+        get_args_from_str(config).unwrap()
+    );
+}