add vcs support

5 files changed, 328 insertions, 6 deletions

diff --git a/src/main.rs b/src/main.rs
index 471a3a2..85b4627 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,6 @@
 extern crate chrono;
 extern crate clap;
+extern crate git2;
 extern crate hostname;
 extern crate regex;
 extern crate term;
@@ -11,6 +12,7 @@ mod colors;
 mod power;
 mod prompt;
 mod system_info;
+mod vcs;
 
 fn collect_data() -> prompt::PromptData {
     let matches = clap::App::new("fancy-prompt")
@@ -45,6 +47,7 @@ fn collect_data() -> prompt::PromptData {
         is_root: system_info::is_root(),
         time: system_info::time(),
         power_info: system_info::power_info(),
+        vcs_info: system_info::vcs_info(),
     }
 }
 
diff --git a/src/prompt.rs b/src/prompt.rs
index 2679bc9..12a7ee5 100644
--- a/src/prompt.rs
+++ b/src/prompt.rs
@@ -2,15 +2,17 @@ use chrono;
 use regex;
 use std;
 
+use std::fmt::Write;
+
 use colors;
 use power;
+use vcs;
 
 pub struct Prompt {
     colors: colors::Colors,
     data: PromptData,
 }
 
-#[derive(Debug)]
 pub struct PromptData {
     pub shell: colors::ShellType,
     pub error_code: u8,
@@ -22,6 +24,7 @@ pub struct PromptData {
     pub is_root: bool,
     pub time: chrono::DateTime<chrono::Local>,
     pub power_info: power::PowerInfo,
+    pub vcs_info: Option<Box<vcs::VcsInfo>>,
 }
 
 impl Prompt {
@@ -36,13 +39,22 @@ impl Prompt {
         let user = self.data.user.clone().unwrap_or(String::from("???"));
         let host = self.data.hostname.clone().unwrap_or(String::from("???"));
 
+        let max_vcs_len = 20; // "g*+?:mybr...nch:+1-1"
+        let (vcs, vcs_err) = self.format_vcs();
+        let vcs = vcs.map(|vcs| {
+            compress_vcs(&vcs, max_vcs_len)
+        });
+
         let battery_len = 10;
         let cols = self.data.terminal_cols.unwrap_or(80);
 
-        // " (~/a/...cde) ---- {--<=======} doy@lance [19:40:50] "
+        // " (~/a/...cde|g*+?:mybr:+1-1) -- {--<=======} doy@lance [19:40:50] "
         let max_path_len = cols
             - 1                            // " "
-            - 2                            // "()"
+            - vcs
+                .as_ref()
+                .map(|vcs| vcs.len() + 1)  // "|g*+?:mybr:+1-1"
+                .unwrap_or(0) - 2          // "()"
             - 1                            // " "
             - 1                            // "-"
             - 1                            // " "
@@ -65,9 +77,10 @@ impl Prompt {
             &self.data.home,
             max_path_len
         );
+        let path_err = false; // XXX
 
         self.colors.pad(1);
-        self.display_path(&path);
+        self.display_path(&path, path_err, &vcs, vcs_err);
 
         self.colors.pad(1);
         self.display_border(max_path_len - path.len() + 1);
@@ -91,9 +104,19 @@ impl Prompt {
         self.colors.pad(1);
     }
 
-    fn display_path(&self, path: &str) {
+    fn display_path(
+        &self,
+        path: &str,
+        path_err: bool,
+        vcs: &Option<String>,
+        vcs_err: bool
+    ) {
         self.colors.print_host(&self.data.hostname, "(");
-        self.colors.print("default", path);
+        self.colors.print(if path_err { "error" } else { "default" }, path);
+        if let &Some(ref vcs) = vcs {
+            self.colors.print_host(&self.data.hostname, "|");
+            self.colors.print(if vcs_err { "error" } else { "default" }, &vcs);
+        }
         self.colors.print_host(&self.data.hostname, ")");
     }
 
@@ -159,6 +182,64 @@ impl Prompt {
         let prompt = if self.data.is_root { "#" } else { "$" };
         self.colors.print_user(&self.data.user, prompt);
     }
+
+    fn format_vcs(&self) -> (Option<String>, bool) {
+        (self.data.vcs_info.as_ref().map(|vcs_info| {
+            let mut vcs = String::new();
+
+            write!(vcs, "{}", vcs_id(vcs_info.vcs())).unwrap();
+
+            if vcs_info.has_modified_files() {
+                write!(vcs, "*").unwrap();
+            }
+            if vcs_info.has_staged_files() {
+                write!(vcs, "+").unwrap();
+            }
+            if vcs_info.has_new_files() {
+                write!(vcs, "?").unwrap();
+            }
+            if !vcs_info.has_commits() {
+                write!(vcs, "!").unwrap();
+            }
+
+            let branch = vcs_info.branch().map(|branch| {
+                if branch == "master" {
+                    String::new()
+                }
+                else {
+                    branch
+                }
+            }).unwrap_or(String::from("???"));
+            if branch != "" {
+                write!(vcs, ":").unwrap();
+            }
+            write!(vcs, "{}", branch).unwrap();
+
+            if let Some((local, remote)) = vcs_info.remote_branch_diff() {
+                if local > 0 || remote > 0 {
+                    write!(vcs, ":").unwrap();
+                }
+                if local > 0 {
+                    write!(vcs, "+{}", local).unwrap();
+                }
+                if remote > 0 {
+                    write!(vcs, "-{}", remote).unwrap();
+                }
+            }
+            else {
+                write!(vcs, ":-").unwrap();
+            }
+
+            match vcs_info.active_operation() {
+                vcs::ActiveOperation::None => {},
+                op => {
+                    write!(vcs, "({})", active_operation_id(op)).unwrap();
+                }
+            }
+
+            vcs
+        }), false) // XXX
+    }
 }
 
 fn battery_discharge_color(usage: f64, charging: bool) -> &'static str {
@@ -226,3 +307,25 @@ fn compress_path<T, U>(
         String::from("???")
     }
 }
+
+fn compress_vcs(vcs: &str, _len: usize) -> String {
+    // XXX
+    String::from(vcs)
+}
+
+fn vcs_id(vcs: vcs::VcsType) -> String {
+    match vcs {
+        vcs::VcsType::Git => String::from("g"),
+    }
+}
+
+fn active_operation_id(op: vcs::ActiveOperation) -> String {
+    match op {
+        vcs::ActiveOperation::None => String::new(),
+        vcs::ActiveOperation::Merge => String::from("m"),
+        vcs::ActiveOperation::Revert => String::from("v"),
+        vcs::ActiveOperation::CherryPick => String::from("c"),
+        vcs::ActiveOperation::Bisect => String::from("b"),
+        vcs::ActiveOperation::Rebase => String::from("r"),
+    }
+}
diff --git a/src/system_info.rs b/src/system_info.rs
index 2079ea7..47ed0f9 100644
--- a/src/system_info.rs
+++ b/src/system_info.rs
@@ -5,6 +5,7 @@ use std;
 use users;
 
 use power;
+use vcs;
 
 pub fn hostname() -> Option<String> {
     hostname::get_hostname()
@@ -44,3 +45,7 @@ pub fn time() -> chrono::DateTime<chrono::Local> {
 pub fn power_info() -> power::PowerInfo {
     power::PowerInfo::new()
 }
+
+pub fn vcs_info() -> Option<Box<vcs::VcsInfo>> {
+    vcs::detect()
+}
diff --git a/src/vcs/git.rs b/src/vcs/git.rs
new file mode 100644
index 0000000..749d498
--- /dev/null
+++ b/src/vcs/git.rs
@@ -0,0 +1,176 @@
+use git2;
+use std;
+
+use std::fmt::Write;
+
+#[derive(Debug)]
+pub struct GitInfo {
+    modified_files: bool,
+    staged_files: bool,
+    new_files: bool,
+    commits: bool,
+    active_operation: super::ActiveOperation,
+    branch: Option<String>,
+    remote_branch_diff: Option<(usize, usize)>,
+}
+
+impl GitInfo {
+    pub fn new(git: git2::Repository) -> GitInfo {
+        let mut modified_statuses = git2::Status::empty();
+        modified_statuses.insert(git2::STATUS_WT_DELETED);
+        modified_statuses.insert(git2::STATUS_WT_MODIFIED);
+        modified_statuses.insert(git2::STATUS_WT_RENAMED);
+        modified_statuses.insert(git2::STATUS_WT_TYPECHANGE);
+        let mut staged_statuses = git2::Status::empty();
+        staged_statuses.insert(git2::STATUS_INDEX_DELETED);
+        staged_statuses.insert(git2::STATUS_INDEX_MODIFIED);
+        staged_statuses.insert(git2::STATUS_INDEX_NEW);
+        staged_statuses.insert(git2::STATUS_INDEX_RENAMED);
+        staged_statuses.insert(git2::STATUS_INDEX_TYPECHANGE);
+        let mut new_statuses = git2::Status::empty();
+        new_statuses.insert(git2::STATUS_WT_NEW);
+
+        let mut status_options = git2::StatusOptions::new();
+        status_options.include_untracked(true);
+        if true { // XXX
+            status_options.update_index(true);
+        }
+        else {
+            status_options.update_index(false);
+            status_options.no_refresh(true);
+        }
+        let status = git.statuses(Some(&mut status_options));
+        let mut modified_files = false;
+        let mut staged_files = false;
+        let mut new_files = false;
+        for status in status.iter() {
+            for file in status.iter() {
+                if file.status().intersects(modified_statuses) {
+                    modified_files = true;
+                }
+                if file.status().intersects(staged_statuses) {
+                    staged_files = true;
+                }
+                if file.status().intersects(new_statuses) {
+                    new_files = true;
+                }
+            }
+        }
+
+        let head = git.head();
+        let commits = head.is_ok();
+        let branch = head.ok()
+            .and_then(|head| {
+                if head.is_branch() {
+                    head.shorthand().map(|s| s.to_string())
+                }
+                else {
+                    head.resolve().ok()
+                        .and_then(|head| head.target())
+                        .map(|oid| {
+                            let mut sha = String::new();
+                            for b in oid.as_bytes().iter() {
+                                write!(sha, "{:02x}", b).unwrap();
+                            }
+                            sha.truncate(7);
+                            sha
+                        })
+                }
+            });
+
+        let active_operation = match git.state() {
+            git2::RepositoryState::Merge
+                => super::ActiveOperation::Merge,
+            git2::RepositoryState::Revert
+                | git2::RepositoryState::RevertSequence
+                => super::ActiveOperation::Revert,
+            git2::RepositoryState::CherryPick
+                | git2::RepositoryState::CherryPickSequence
+                => super::ActiveOperation::CherryPick,
+            git2::RepositoryState::Bisect
+                => super::ActiveOperation::Bisect,
+            git2::RepositoryState::Rebase
+                | git2::RepositoryState::RebaseInteractive
+                | git2::RepositoryState::RebaseMerge
+                => super::ActiveOperation::Rebase,
+            _ => super::ActiveOperation::None,
+        };
+
+        let remote_branch_diff = git.head().ok()
+            .and_then(|head| if head.is_branch() { Some(head) } else { None })
+            .and_then(|head| {
+                head.resolve().ok()
+            })
+            .map(|head| {
+                (head.target(), head.shorthand().map(|s| s.to_string()))
+            })
+            .and_then(|(head_id, name)| {
+                head_id.and_then(|head_id| {
+                    name.and_then(|name| {
+                        git.refname_to_id(
+                            &(String::from("refs/remotes/origin/") + &name)
+                        ).ok().and_then(|remote_id| {
+                            git.graph_ahead_behind(head_id, remote_id).ok()
+                        })
+                    })
+                })
+            });
+
+        GitInfo {
+            modified_files: modified_files,
+            staged_files: staged_files,
+            new_files: new_files,
+            commits: commits,
+            active_operation: active_operation,
+            branch: branch,
+            remote_branch_diff: remote_branch_diff,
+        }
+    }
+}
+
+impl super::VcsInfo for GitInfo {
+    fn vcs(&self) -> super::VcsType {
+        super::VcsType::Git
+    }
+
+    fn has_modified_files(&self) -> bool {
+        self.modified_files
+    }
+
+    fn has_staged_files(&self) -> bool {
+        self.staged_files
+    }
+
+    fn has_new_files(&self) -> bool {
+        self.new_files
+    }
+
+    fn has_commits(&self) -> bool {
+        self.commits
+    }
+
+    fn active_operation(&self) -> super::ActiveOperation {
+        self.active_operation
+    }
+
+    fn branch(&self) -> Option<String> {
+        self.branch.clone()
+    }
+
+    fn remote_branch_diff(&self) -> Option<(usize, usize)> {
+        self.remote_branch_diff
+    }
+}
+
+pub fn detect() -> Option<Box<super::VcsInfo>> {
+    let git = std::env::current_dir().ok().and_then(|pwd| {
+        git2::Repository::discover(pwd).ok()
+    });
+
+    if let Some(git) = git {
+        Some(Box::new(GitInfo::new(git)))
+    }
+    else {
+        None
+    }
+}
diff --git a/src/vcs/mod.rs b/src/vcs/mod.rs
new file mode 100644
index 0000000..02c2eb7
--- /dev/null
+++ b/src/vcs/mod.rs
@@ -0,0 +1,35 @@
+mod git;
+
+pub enum VcsType {
+    Git,
+}
+
+#[derive(Debug,Copy,Clone)]
+pub enum ActiveOperation {
+    None,
+    Merge,
+    Revert,
+    CherryPick,
+    Bisect,
+    Rebase,
+}
+
+pub trait VcsInfo {
+    fn vcs(&self) -> VcsType;
+    fn has_modified_files(&self) -> bool;
+    fn has_staged_files(&self) -> bool;
+    fn has_new_files(&self) -> bool;
+    fn has_commits(&self) -> bool;
+    fn active_operation(&self) -> ActiveOperation;
+    fn branch(&self) -> Option<String>;
+    fn remote_branch_diff(&self) -> Option<(usize, usize)>;
+}
+
+pub fn detect() -> Option<Box<VcsInfo>> {
+    if let Some(git) = git::detect() {
+        Some(git)
+    }
+    else {
+        None
+    }
+}