Proton support (#64)

Enable proton for heroic games

src/steam/proton_vdf_util.rs

@@ -0,0 +1,137 @@
+use std::path::Path;
+
+use nom::FindSubstring;
+
+
+pub fn setup_proton_games<B: AsRef<str>>(games: &[B]){ 
+    if let Ok(home) = std::env::var("HOME"){
+        let config_file = Path::new(&home).join(".local/share/Steam/config/config.vdf");
+        if config_file.exists(){
+            if let Ok(config_content) = std::fs::read_to_string(&config_file){
+                let new_string = enable_proton_games(config_content, games);
+                std::fs::write(config_file, new_string).unwrap();
+            }
+        }
+    }
+    
+    
+}
+
+fn enable_proton_games<S: AsRef<str>, B: AsRef<str>>(vdf_content: S, games: &[B]) -> String {
+    let vdf_content = vdf_content.as_ref();
+    if let Some(section_info) = find_indexes(vdf_content) {
+        let (base_indent_string, field_indent_string) = {
+            let mut a = String::new();
+            let mut b = String::new();
+            for _i in 0..=section_info.base_indentation {
+                a.push('\t');
+                b.push('\t');
+            }
+            b.push('\t');
+            (a, b)
+        };
+
+        let proton_replace_string = include_str!("proton_string.txt");
+        let section_str = &vdf_content[section_info.start..section_info.append_end];
+        let games_strings_to_add = games
+            .iter()
+            .filter(|g| {
+                let game_section_start = format!("\"{}\"\n", g.as_ref());
+                !section_str.contains(&game_section_start)
+            })
+            .map(|game_id| {
+                let res = proton_replace_string.to_string();
+                let res = res.replace("\"X\"", &format!("\"{}\"", game_id.as_ref()));
+                let res = res.replace("=", &base_indent_string);
+                let res = res.replace("+", &field_indent_string);
+                res
+            });
+        let mut new_section = section_str.to_string();
+        for game_string in games_strings_to_add {
+            new_section.push_str(&game_string);
+        }
+        new_section.push_str(&section_info.end_key);
+
+        let before_section = &vdf_content[..section_info.start];
+        let after_section = &vdf_content[section_info.end..];
+        return format!("{}{}{}", before_section, new_section, after_section);
+    } else {
+        //TODO make this an error instead?
+        println!("Could not find proton section in steam, try to manually set proton on at least one game and then rerun");
+    }
+    return vdf_content.to_string();
+}
+
+struct SectionInfo {
+    start: usize,
+    end: usize,
+    append_end: usize,
+    base_indentation: usize,
+    end_key: String,
+}
+
+fn find_indexes<S: AsRef<str>>(vdf_content: S) -> Option<SectionInfo> {
+    let compat_key = "\"CompatToolMapping\"\n";
+    let vdf_content = vdf_content.as_ref();
+    if let Some(compat_index) = vdf_content.find_substring(compat_key) {
+        let compat_index = compat_index + compat_key.len();
+        let after_key = vdf_content[compat_index..].to_string();
+        if let Some(base_indentation) = after_key.find('{') {
+            let mut end_key = "\n".to_string();
+            for _i in 0..base_indentation {
+                end_key.push('\t');
+            }
+            end_key.push('}');
+            if let Some(end_index) = after_key.as_str().find_substring(&end_key) {
+                return Some(SectionInfo {
+                    start: compat_index,
+                    end: compat_index + end_index + end_key.len(),
+                    append_end: compat_index + end_index,
+                    base_indentation,
+                    end_key: end_key.to_string(),
+                });
+            }
+        }
+    }
+    None
+}
+
+#[cfg(test)]
+#[cfg(target_family = "unix")]
+mod tests {
+
+    use super::*;
+
+    #[test]
+    pub fn can_find_index_test() {
+        let input = include_str!("../testdata/vdf/testconfig.vdf");
+        let SectionInfo {
+            start,
+            end,
+            base_indentation,
+            ..
+        } = find_indexes(input).unwrap();
+
+        let actual = input[start..end].to_string();
+        let expected = include_str!("../testdata/vdf/compatmappingsection.vdf");
+        assert_eq!(expected, actual);
+        assert_eq!(4, base_indentation);
+        
+    }
+
+    #[test]
+    pub fn enable_proton_test() {
+        let input = include_str!("../testdata/vdf/testconfig.vdf");
+        let output = enable_proton_games(input, &vec!["42", "43", "44"]);
+        let expected = include_str!("../testdata/vdf/testconfig_expected.vdf");
+        assert_eq!(expected,output );
+    }
+
+    #[test]
+    pub fn enable_proton_test_empty() {
+        let input = include_str!("../testdata/vdf/testconfig.vdf");
+        let output = enable_proton_games(input, &vec!["2719403116"]);
+        let expected = include_str!("../testdata/vdf/testconfig.vdf");
+        assert_eq!(expected,output );
+    }
+}