gitsw 0.1.0

A smart Git branch switcher with automatic stash management and dependency installation
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141

use anyhow::{Context, Result};
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fs;
use std::path::{Path, PathBuf};

const STATE_FILE_NAME: &str = "git-switch.json";

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BranchState {
    /// The OID of the stash created when leaving this branch
    pub stash_id: Option<String>,
    /// SHA256 hash of the lock file when we last visited this branch
    pub lock_file_hash: Option<String>,
    /// Timestamp of last visit to this branch
    pub last_visited: DateTime<Utc>,
}

impl Default for BranchState {
    fn default() -> Self {
        Self {
            stash_id: None,
            lock_file_hash: None,
            last_visited: Utc::now(),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, Default)]
pub struct StateData {
    pub branches: HashMap<String, BranchState>,
}

pub struct StateManager {
    path: PathBuf,
    data: StateData,
}

impl StateManager {
    /// Load state from .git/git-switch.json
    pub fn load(git_dir: &Path) -> Result<Self> {
        let path = git_dir.join(STATE_FILE_NAME);

        let data = if path.exists() {
            let content = fs::read_to_string(&path)
                .with_context(|| format!("Failed to read state file: {}", path.display()))?;
            serde_json::from_str(&content).unwrap_or_default()
        } else {
            StateData::default()
        };

        Ok(Self { path, data })
    }

    /// Save state to .git/git-switch.json
    pub fn save(&self) -> Result<()> {
        let content = serde_json::to_string_pretty(&self.data)?;
        fs::write(&self.path, content)
            .with_context(|| format!("Failed to write state file: {}", self.path.display()))?;
        Ok(())
    }

    /// Get state for a specific branch
    pub fn get_branch(&self, branch_name: &str) -> Option<&BranchState> {
        self.data.branches.get(branch_name)
    }

    /// Set state for a branch
    pub fn set_branch(&mut self, branch_name: &str, state: BranchState) {
        self.data.branches.insert(branch_name.to_string(), state);
    }

    /// Update the stash ID for a branch
    pub fn set_stash(&mut self, branch_name: &str, stash_id: Option<String>) {
        let state = self
            .data
            .branches
            .entry(branch_name.to_string())
            .or_default();
        state.stash_id = stash_id;
        state.last_visited = Utc::now();
    }

    /// Update the lock file hash for a branch
    pub fn set_lock_hash(&mut self, branch_name: &str, hash: Option<String>) {
        let state = self
            .data
            .branches
            .entry(branch_name.to_string())
            .or_default();
        state.lock_file_hash = hash;
        state.last_visited = Utc::now();
    }

    /// Get all branches with stashes
    pub fn branches_with_stashes(&self) -> Vec<(&str, &BranchState)> {
        self.data
            .branches
            .iter()
            .filter(|(_, state)| state.stash_id.is_some())
            .map(|(name, state)| (name.as_str(), state))
            .collect()
    }

    /// Remove branch state
    pub fn remove_branch(&mut self, branch_name: &str) {
        self.data.branches.remove(branch_name);
    }

    /// Clear stash from branch state
    pub fn clear_stash(&mut self, branch_name: &str) {
        if let Some(state) = self.data.branches.get_mut(branch_name) {
            state.stash_id = None;
        }
    }

    /// Get recent branches sorted by last visited time
    pub fn recent_branches(&self, limit: usize) -> Vec<(&str, &BranchState)> {
        let mut branches: Vec<_> = self
            .data
            .branches
            .iter()
            .map(|(name, state)| (name.as_str(), state))
            .collect();

        branches.sort_by(|a, b| b.1.last_visited.cmp(&a.1.last_visited));
        branches.truncate(limit);
        branches
    }

    /// Update last visited timestamp for a branch
    pub fn touch_branch(&mut self, branch_name: &str) {
        let state = self
            .data
            .branches
            .entry(branch_name.to_string())
            .or_default();
        state.last_visited = Utc::now();
    }
}