#!/bin/sh
# This file is a part of Julia. License is MIT: https://julialang.org/license

# This file collects git info and create a julia file with the GIT_VERSION_INFO struct

echo "# This file was autogenerated in base/version_git.sh"
echo "struct GitVersionInfo"
echo "    commit::AbstractString"
echo "    commit_short::AbstractString"
echo "    branch::AbstractString"
echo "    build_number::Int"
echo "    date_string::AbstractString"
echo "    tagged_commit::Bool"
echo "    fork_master_distance::Int"
echo "    fork_master_timestamp::Float64"
echo "end"
echo ""

cd $1

# If the script didn't ask not to use git info
if test  "$Argc" = "2"  -a $2 = "NO_GIT" {
    # this comment is used in base/Makefile to distinguish boilerplate
    echo "# Default output if git is not available."
    echo "const GIT_VERSION_INFO = GitVersionInfo(\"\" ,\"\" ,\"\" ,0 ,\"\" ,true ,0 ,0.)"
    exit 0
}
# Collect temporary variables
setglobal origin = $[git config -l !2 >/dev/null | grep 'remote\.\w*\.url.*JuliaLang/julia' | sed -n 's/remote\.\([a-zA-Z]*\)\..*/\1\//p]
if test -z $origin {
    setglobal origin = '"origin/'"
}
setglobal git_time = $[git log -1 --pretty=format:%ct]

#collect the contents
setglobal commit = $[git rev-parse HEAD]
setglobal commit_short = $[git rev-parse --short HEAD]
if test -n $[git status --porcelain] {
    # append dirty mark '*' if the repository has uncommited changes
    setglobal commit_short = ""$commit_short"*"
}
setglobal branch = $[git branch | sed -n '/\* /s///p]

setglobal topdir = $[git rev-parse --show-toplevel]
setglobal verchanged = $[git blame -L ,1 -sl -- "$topdir/VERSION" | cut -f 1 -d " ]
if test $verchanged = 0000000000000000000000000000000000000000 {
    # uncommited change to VERSION
    setglobal build_number = '0'
} else {
    setglobal build_number = $[git rev-list --count HEAD "^$verchanged]
}

setglobal date_string = $git_time
match $[uname] {
  with Darwin | FreeBSD
    setglobal date_string = $[/bin/date -jr $git_time -u '+%Y-%m-%d %H:%M %Z]
    
  with MINGW*
    setglobal git_time = $[git log -1 --pretty=format:%ci]
    setglobal date_string = $[/bin/date --date="$git_time" -u '+%Y-%m-%d %H:%M %Z]
    
  with *
    setglobal date_string = $[/bin/date --date="@$git_time" -u '+%Y-%m-%d %H:%M %Z]
    
}
if test $[git describe --tags --exact-match !2 > /dev/null] {
    setglobal tagged_commit = '"true'"
} else {
    setglobal tagged_commit = '"false'"
}
setglobal fork_master_distance = $[git rev-list HEAD ^"$[echo $origin]master" | wc -l | sed -e 's/[^[:digit:]]//g]
setglobal fork_master_timestamp = $[git show -s $[git merge-base HEAD $[echo $origin]master] --format=format:"%ct]

# Check for errrors and emit default value for missing numbers.
if test -z $build_number {
    setglobal build_number = '"-1'"
}
if test -z $fork_master_distance {
    setglobal fork_master_distance = '"-1'"
}
if test -z $fork_master_timestamp {
    setglobal fork_master_timestamp = '"0'"
}

echo "const GIT_VERSION_INFO = GitVersionInfo("
echo "    \"$commit\","
echo "    \"$commit_short\","
echo "    \"$branch\","
echo "    $build_number,"
echo "    \"$date_string\","
echo "    $tagged_commit,"
echo "    $fork_master_distance,"
echo "    $fork_master_timestamp."
echo ")"