Fix hyperlink absolute paths (#939)

Fix file paths and hyperlinks

With this commit the target of a hyperlink should always be an absolute path. This should be true for all file hyperlinks, e.g.

- File hyperlink
- Hunk header hyperlink
- Line number hyperlink

Fixes #890

src/config.rs

@@ -25,8 +25,8 @@ use crate::parse_styles;
 use crate::style;
 use crate::style::Style;
 use crate::tests::TESTING;
+use crate::utils;
 use crate::utils::bat::output::PagingMode;
-use crate::utils::cwd::cwd_of_user_shell_process;
 use crate::utils::regex_replacement::RegexReplacement;
 use crate::utils::syntect::FromDeltaStyle;
 use crate::wrapping::WrapConfig;
@@ -245,9 +245,14 @@ impl From<cli::Opt> for Config {
 
         let wrap_max_lines_plus1 = adapt_wrap_max_lines_argument(opt.wrap_max_lines);
 
+        #[cfg(not(test))]
         let cwd_of_delta_process = std::env::current_dir().ok();
+        #[cfg(test)]
+        let cwd_of_delta_process = Some(utils::path::fake_delta_cwd_for_tests());
+
         let cwd_relative_to_repo_root = std::env::var("GIT_PREFIX").ok();
-        let cwd_of_user_shell_process = cwd_of_user_shell_process(
+
+        let cwd_of_user_shell_process = utils::path::cwd_of_user_shell_process(
             cwd_of_delta_process.as_ref(),
             cwd_relative_to_repo_root.as_deref(),
         );