scripts/project-root at master · JCoMcL/scripts · GitHub

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#!/bin/sh

# Print project root relative to current working directory
# Favors correctness over speed; stops at first match.

set -eu

cwd="$(pwd -P)"

# Normalize path
abspath() {
    cd "$1" 2>/dev/null && pwd -P
}

# Convert absolute path to relative (portable)
relpath() {
    target="$1"
    base="$2"

    # If realpath is available, use it
    if command -v realpath >/dev/null 2>&1; then
        realpath --relative-to="$base" "$target"
        return
    fi

    # Fallback: manual method
    common="$base"
    up=""

    while [ "${target#"$common"/}" = "$target" ]; do
        common=$(dirname "$common")
        up="../$up"
        [ "$common" = "/" ] && break
    done

    down="${target#"$common"/}"
    printf '%s%s\n' "$up" "$down"
}

# Try VCS-based detection
find_vcs_root() {
    if command -v git >/dev/null 2>&1; then
        git_root=$(git rev-parse --show-toplevel 2>/dev/null || true)
        [ -n "$git_root" ] && echo "$git_root" && return
    fi

    dir="$cwd"
    while [ "$dir" != "/" ]; do
        for m in .hg .svn; do
            [ -e "$dir/$m" ] && echo "$dir" && return
        done
        dir=$(dirname "$dir")
    done
}

# Try project marker files
find_marker_root() {
    markers="
        .project-root
        .root
        pyproject.toml
        setup.py
        package.json
        go.mod
        Cargo.toml
        Makefile
    "

    dir="$cwd"
    while [ "$dir" != "/" ]; do
        for m in $markers; do
            [ -e "$dir/$m" ] && echo "$dir" && return
        done
        dir=$(dirname "$dir")
    done
}

# Main detection logic
root=""

root="$(find_vcs_root || true)"
[ -z "$root" ] && root="$(find_marker_root || true)"
[ -z "$root" ] && root="$cwd"

root="$(abspath "$root")"

# Print relative path
relpath "$root" "$cwd"