GIT hooks: post-merge, post-commit, post-checkout

scripts intended as local git hooks.
post-merge:
- create symlink ESPEasy - if necessary
- add "#define BUILD_GIT <git revision>" to Custom.h
- add "#define USE_CUSTOM_H" to src/ESPEasy-Globals.h

post-commit:
- add "#define BUILD_GIT <git revision>" to Custom.h

post-checkout:
- on branch checkout also add "#define BUILD_GIT <git revision>"

.gitignore

@@ -16,3 +16,4 @@
 ## Project #####################
 lib/readme.txt
 src/Custom.h
+/ESPEasy

hooks/post-checkout

@@ -0,0 +1,11 @@
+#!/bin/bash
+# purpose: GIT post-commit
+#   change value of BUILD_GIT macro 
+#
+WORKDIR=src
+CUSTOM_H=${WORKDIR}/Custom.h
+GLOBAL_H=${WORKDIR}/ESPEasy-Globals.h
+
+# update BUILD_GIT on branch checkout
+[[ $3 == 1 && -f ${CUSTOM_H} ]] && \
+    sed -i.bak -e "s/\(#define BUILD_GIT\).*/\1 $(git log -1 --pretty=format:%h HEAD)/" ${CUSTOM_H}

hooks/post-commit

@@ -0,0 +1,10 @@
+#!/bin/bash
+# purpose: GIT post-commit
+#   change value of BUILD_GIT macro 
+#
+WORKDIR=src
+CUSTOM_H=${WORKDIR}/Custom.h
+GLOBAL_H=${WORKDIR}/ESPEasy-Globals.h
+
+[[ -f ${CUSTOM_H} ]] && \
+sed -i.bak -e "s/\(#define BUILD_GIT\).*/\1 $(git log -1 --pretty=format:%h HEAD)/" ${CUSTOM_H}

hooks/post-merge

@@ -0,0 +1,21 @@
+#!/bin/bash
+# build an include file to select plugins
+#
+WORKDIR=ESPEasy
+CUSTOM_H=${WORKDIR}/Custom.h
+GLOBAL_H=${WORKDIR}/ESPEasy-Globals.h
+
+[[ -L ${WORKDIR} ]] || (
+  ln -s src ${WORKDIR}
+)
+
+# we expect that ${CUSTOM_H} always contains a "#define BUILD_GIT" macro
+[[ -f ${CUSTOM_H} ]] && (
+echo "post_merge: change BUILD_GIT"
+sed -i.bak -e "s/\(#define BUILD_GIT\).*/\1 $(git log -1 --pretty=format:%h HEAD)/" ${CUSTOM_H}
+)
+
+# uncomment if you don't want to use the Custom.h include
+grep -q "^#define USE_CUSTOM_H" ${GLOBAL_H} || (
+sed -i -e "/[ \t]*#define ESPEASY_GLOBALS_H_/a #define USE_CUSTOM_H" ${GLOBAL_H}
+)