Add new utilities: git-follow, git-buildmsg

2 files changed, 226 insertions, 0 deletions

diff --git a/git-buildmsg/Makefile-files b/git-buildmsg/Makefile-files
new file mode 100644
index 0000000..88ad8f4
--- /dev/null
+++ b/git-buildmsg/Makefile-files
@@ -0,0 +1,4 @@
+# -*- makefile -*-
+bin_SCRIPTS  += git-buildmsg/git-buildmsg
+EXTRA_DIST   += git-buildmsg/git-buildmsg
+UPLOAD_FILES += git-buildmsg/git-buildmsg
diff --git a/git-buildmsg/git-buildmsg b/git-buildmsg/git-buildmsg
new file mode 100644
index 0000000..c6be42d
--- /dev/null
+++ b/git-buildmsg/git-buildmsg
@@ -0,0 +1,222 @@
+#!/bin/sh
+#
+# Generate some basic versioning information which can be piped to a header.
+#
+# Copyright (c) 2006-2007 Luc Verhaegen <libv@skynet.be>
+# Copyright (C) 2007 Hans Ulrich Niedermann <hun@n-dimensional.de>
+#
+# The author thanks the nice people on #git for the assistance!
+#
+# Simple testing of this script:
+#   env SED="/sbin/busybox sed" \
+#   /sbin/busybox sh git-buildmsg --example > moo.c \
+#     && gcc -Wall -Wextra -Wno-unused -o moo moo.c \
+#     && ./moo
+#   (bash and other seds should also do)
+#
+# Ideas:
+#  * Output for languages other than C (Erlang, Python, Perl, sh, ...)
+
+# The caller may have found these programs for us
+SED="${SED-sed}"
+
+# Initialize
+GIT_DIR=".git"
+working_dir="$(pwd)"
+
+# Who am I?
+self="$(basename "$0")"
+
+# Defaults
+ifndef_symbol="GIT_VERSION_H"
+outfile="-"
+print_example=false
+srcdir="$(pwd)"
+
+# Parse command line parameter, affecting defaults
+while [ "x$1" != "x" ]
+do
+    case "$1" in
+        --example)
+            print_example=:
+            ;;
+        -o|--output)
+            if shift; then
+                outfile="$1"
+                if [ "x$outfile" = "x-" ]; then
+                    : # keep default ifndef_symbol
+                else
+                    ifndef_symbol=`basename "$outfile" | $SED 's|\.|_|g; s|[^A-Za-z0-9_]||g' | tr a-z A-Z`
+                fi
+            else
+                echo "$self: Fatal: \"$1\" option requires parameter." >&2
+                exit 1
+            fi
+            ;;
+        --version)
+	    echo "$self (@PACKAGE_NAME@) @PACKAGE_VERSION@"
+	    exit
+	    ;;
+        --help)
+            echo "Supported params: --help, --example, -o|--output"
+            exit
+            ;;
+	-s|--srcdir)
+	    if shift; then
+		if test -d "$1"; then
+		    srcdir="$1"
+		else
+		    echo "$self: Fatal: \"$1\" not a directory."
+		    exit 1
+		fi
+	    else
+		echo "$self: Fatal: \"$1\" option requires directory parameter."
+		exit 1
+	    fi
+	    ;;
+        *)
+            echo "$self: Fatal: Invalid command line paramenter: \"$1\"" >&2
+            exit 1
+            ;;
+    esac
+    shift
+done
+
+# If not printing to stdout, redirect stdout to output file
+rename_new_output=false
+if [ "x$outfile" = "x-" ]
+then
+    : # keep using stdout
+else
+    exec 1> "${outfile}.new"
+fi
+
+# Done with creating output files, so we can change to source dir
+cd "$srcdir"
+
+# Write program header
+cat<<EOF
+/*
+ * Basic versioning gathered from the git repository.
+ * Automatically generated by $0.
+ */
+
+#ifndef ${ifndef_symbol}
+#define ${ifndef_symbol} 1
+
+EOF
+
+# Detect git tools (should work with old and new git versions)
+git_found=yes
+for git_tool in git-symbolic-ref git-rev-parse git-diff-files git-diff-index
+do
+    [ x`which $git_tool 2>/dev/null` = "x" ] && { git_found=no; break; }
+done
+
+# Determine and write git specific defines
+if [ "x$git_found" = "xyes" ]; then
+    if [ -e "$GIT_DIR/index" ]; then
+        echo "/* This is a git repository */"
+        echo "#define GIT_USED 1"
+        echo ""
+
+        # Commit SHA-ID
+        git_shaid=`git-rev-parse HEAD | $SED -n 's/^\(.\{8\}\).*/\1/p'`
+        echo "/* Git SHA ID of last commit */"
+        echo "#define GIT_SHAID \"${git_shaid}..\""
+        echo ""
+
+        # Branch
+        git_branch=`git-symbolic-ref HEAD | $SED -n 's|^refs/heads/||p'`
+        echo "/* Branch this tree is on */"
+        echo "#define GIT_BRANCH \"$git_branch\""
+        echo ""
+
+        # Any uncommitted changes we should know about?
+        # Or technically: Are the working tree or index dirty?
+        if git-diff-files --quiet && git-diff-index --cached --quiet HEAD; then
+            echo "/* SHA-ID uniquely defines the state of this code */"
+            echo "#undef GIT_UNCOMMITTED"
+        else
+            echo "/* Local changes might be breaking things */"
+            echo "#define GIT_UNCOMMITTED 1"
+        fi
+    else
+        echo "/* This is not a git repository */"
+        echo "#undef GIT_USED"
+    fi
+else
+    echo "/* git is not installed */"
+    echo "#undef GIT_USED"
+fi
+
+# Define a few immediately useful message strings
+cat<<EOF
+
+/* Define GIT_MESSAGE such that
+ *    printf("%s: built from %s", argv[0], GIT_MESSAGE);
+ * forms a proper sentence.
+ */
+
+#ifdef GIT_USED
+
+# ifdef GIT_UNCOMMITTED
+#  define GIT_WITH_WITHOUT_UNCOMMITTED " + changes"
+# else
+#  define GIT_WITH_WITHOUT_UNCOMMITTED ""
+# endif /* GIT_UNCOMMITTED */
+
+# define GIT_MESSAGE \\
+        "git branch " GIT_BRANCH ", " \\
+        "commit " GIT_SHAID GIT_WITH_WITHOUT_UNCOMMITTED
+
+#else
+# define GIT_MESSAGE "non-git sources"
+#endif /* GIT_USED */
+
+#endif /* ${ifndef_symbol} */
+EOF
+
+# Example program
+if "$print_example"
+then
+    cat<<EOF
+
+/* example program demonstrating the use of git_version.sh output */
+#include <stdio.h>
+#include <string.h>
+
+int main(int argc, char *argv[])
+{
+    const char *const idx = strrchr(argv[0], '/');
+    const char *const prog = (idx)?(idx+1):(argv[0]);
+#ifdef PACKAGE_VERSION
+    printf("%s: version %s, built from %s\n", prog, PACKAGE_VERSION, GIT_MESSAGE);
+#elif defined(GIT_USED)
+    printf("%s: built from %s\n", prog, GIT_MESSAGE);
+#endif
+    return 0;
+}
+EOF
+fi
+
+# Change back to working dir for the remaining output file manipulations.
+cd "$working_dir"
+
+# If necessary, overwrite outdated output file with new one
+if [ "x$outfile" != "x-" ]
+then
+    if [ -f "$outfile" ]; then
+        if cmp "$outfile" "$outfile.new" > /dev/null; then
+            echo "$self: Output is unchanged, keeping $outfile" >&2
+            rm -f "$outfile.new"
+        else
+            echo "$self: Output has changed, updating $outfile" >&2
+            mv -f "$outfile.new" "$outfile"
+        fi
+    else
+        mv -f "$outfile.new" "$outfile"
+    fi
+fi
+
+# THE END.