feat(version): show commit hash for nightly installs (#517)

Display commit hash in parentheses after "Nightly" channel label
to help users identify exact version when testing nightly builds.

install.sh

@@ -217,6 +217,17 @@ get_source_version() {
     fi
 }
 
+get_source_commit_hash() {
+    # Try to get from local git repo first
+    if [[ -d "$SOURCE_DIR/.git" ]]; then
+        git -C "$SOURCE_DIR" rev-parse --short HEAD 2> /dev/null && return
+    fi
+    # Fallback to GitHub API
+    curl -fsSL --connect-timeout 3 \
+        "https://api.github.com/repos/tw93/mole/commits/main" 2> /dev/null |
+        sed -n 's/.*"sha"[[:space:]]*:[[:space:]]*"\([a-f0-9]\{7\}\).*/\1/p' | head -1
+}
+
 get_latest_release_tag() {
     local tag
     if ! command -v curl > /dev/null 2>&1; then
@@ -288,12 +299,14 @@ resolve_install_channel() {
 
 write_install_channel_metadata() {
     local channel="$1"
+    local commit_hash="${2:-}"
     local metadata_file="$CONFIG_DIR/install_channel"
 
     local tmp_file
     tmp_file=$(mktemp "${CONFIG_DIR}/install_channel.XXXXXX") || return 1
     {
         printf 'CHANNEL=%s\n' "$channel"
+        [[ -n "$commit_hash" ]] && printf 'COMMIT_HASH=%s\n' "$commit_hash"
     } > "$tmp_file" || {
         rm -f "$tmp_file" 2> /dev/null || true
         return 1
@@ -751,9 +764,12 @@ perform_install() {
         installed_version="$source_version"
     fi
 
-    local install_channel
+    local install_channel commit_hash=""
     install_channel="$(resolve_install_channel)"
-    if ! write_install_channel_metadata "$install_channel"; then
+    if [[ "$install_channel" == "nightly" ]]; then
+        commit_hash=$(get_source_commit_hash)
+    fi
+    if ! write_install_channel_metadata "$install_channel" "$commit_hash"; then
         log_warning "Could not write install channel metadata"
     fi
 
@@ -840,9 +856,12 @@ perform_update() {
         updated_version="$target_version"
     fi
 
-    local install_channel
+    local install_channel commit_hash=""
     install_channel="$(resolve_install_channel)"
-    if ! write_install_channel_metadata "$install_channel"; then
+    if [[ "$install_channel" == "nightly" ]]; then
+        commit_hash=$(get_source_commit_hash)
+    fi
+    if ! write_install_channel_metadata "$install_channel" "$commit_hash"; then
         log_warning "Could not write install channel metadata"
     fi
 

mole

@@ -99,6 +99,13 @@ get_install_channel() {
     esac
 }
 
+get_install_commit() {
+    local channel_file="$SCRIPT_DIR/install_channel"
+    if [[ -f "$channel_file" ]]; then
+        sed -n 's/^COMMIT_HASH=\(.*\)$/\1/p' "$channel_file" | head -1
+    fi
+}
+
 # Background update notice
 check_for_updates() {
     local msg_cache="$HOME/.cache/mole/update_message"
@@ -222,7 +229,13 @@ show_version() {
 
     printf '\nMole version %s\n' "$VERSION"
     if [[ "$channel" == "nightly" ]]; then
-        printf 'Channel: Nightly\n'
+        local commit
+        commit=$(get_install_commit)
+        if [[ -n "$commit" ]]; then
+            printf 'Channel: Nightly (%s)\n' "$commit"
+        else
+            printf 'Channel: Nightly\n'
+        fi
     fi
     printf 'macOS: %s\n' "$os_ver"
     printf 'Architecture: %s\n' "$arch"