Initial commit

skills/get-git-diff/scripts/commit_info.sh

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+#!/usr/bin/env bash
+#
+# Git Commit Information Functions
+#
+# Functions for retrieving commit metadata and relationships.
+#
+# Author: Claude Code get-git-diff skill
+# Version: 1.0.0
+
+set -euo pipefail
+
+#######################################
+# Get detailed information about a commit
+# Arguments:
+#   $1 - commit reference
+# Outputs:
+#   Pipe-separated: full_hash|short_hash|author_name|author_email|date|message
+#######################################
+get_commit_info() {
+    local commit_ref="$1"
+    local format="%H|%h|%an|%ae|%ad|%s"
+
+    git log -1 --format="${format}" "${commit_ref}" 2>/dev/null
+}
+
+#######################################
+# Get short hash from commit reference
+# Arguments:
+#   $1 - commit reference
+#   $2 - length (optional, default: 7)
+# Outputs:
+#   Short hash
+#######################################
+get_short_hash() {
+    local commit_ref="$1"
+    local length="${2:-7}"
+
+    git rev-parse --short="${length}" "${commit_ref}" 2>/dev/null
+}
+
+#######################################
+# Check if a commit is a merge commit
+# Arguments:
+#   $1 - commit reference
+# Returns:
+#   0 if merge commit, 1 if not
+# Outputs:
+#   Parent hashes separated by spaces
+#######################################
+is_merge_commit() {
+    local commit_ref="$1"
+    local parents
+
+    if parents=$(git log -1 --format="%P" "${commit_ref}" 2>/dev/null); then
+        local parent_count=$(echo "${parents}" | wc -w)
+        if [[ ${parent_count} -gt 1 ]]; then
+            echo "${parents}"
+            return 0
+        fi
+    fi
+
+    return 1
+}
+
+#######################################
+# Get number of commits between two refs
+# Arguments:
+#   $1 - first commit (older)
+#   $2 - second commit (newer)
+# Outputs:
+#   Number of commits between them
+#######################################
+get_commits_between() {
+    local commit1="$1"
+    local commit2="$2"
+
+    git rev-list --count "${commit1}..${commit2}" 2>/dev/null || echo "0"
+}
+
+#######################################
+# Get commit message (first line)
+# Arguments:
+#   $1 - commit reference
+# Outputs:
+#   Commit message subject line
+#######################################
+get_commit_message() {
+    local commit_ref="$1"
+
+    git log -1 --format="%s" "${commit_ref}" 2>/dev/null
+}
+
+#######################################
+# Get commit author
+# Arguments:
+#   $1 - commit reference
+# Outputs:
+#   Author name and email
+#######################################
+get_commit_author() {
+    local commit_ref="$1"
+
+    git log -1 --format="%an <%ae>" "${commit_ref}" 2>/dev/null
+}
+
+#######################################
+# Get commit date
+# Arguments:
+#   $1 - commit reference
+# Outputs:
+#   Commit date
+#######################################
+get_commit_date() {
+    local commit_ref="$1"
+
+    git log -1 --format="%ad" "${commit_ref}" 2>/dev/null
+}
+
+# Allow script to be sourced or run directly
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+    # Example usage
+    if [[ $# -eq 0 ]]; then
+        echo "Usage: $0 <commit-ref> [<commit-ref2>]"
+        echo ""
+        echo "Examples:"
+        echo "  $0 HEAD"
+        echo "  $0 HEAD HEAD^"
+        exit 1
+    fi
+
+    commit1="$1"
+    commit2="${2:-}"
+
+    echo "=== Commit Info for ${commit1} ==="
+    info=$(get_commit_info "${commit1}")
+    IFS='|' read -r full short author email date message <<< "${info}"
+    echo "Full hash: ${full}"
+    echo "Short hash: ${short}"
+    echo "Author: ${author} <${email}>"
+    echo "Date: ${date}"
+    echo "Message: ${message}"
+
+    if is_merge_commit "${commit1}"; then
+        parents=$(is_merge_commit "${commit1}")
+        echo "Merge commit: yes"
+        echo "Parents: ${parents}"
+    else
+        echo "Merge commit: no"
+    fi
+
+    if [[ -n "${commit2}" ]]; then
+        echo ""
+        echo "=== Comparison: ${commit1} to ${commit2} ==="
+        count=$(get_commits_between "${commit1}" "${commit2}")
+        echo "Commits between: ${count}"
+    fi
+fi