Rewrite templating system

Use "meta templates" that ate actually Bash scripts.

dotfiles/gittum/bin/findcat

@@ -1,6 +0,0 @@
-#!/bin/sh
-
-NAME=$1
-cat ".git_$NAME" 2>/dev/null \
- || cat ".git/gittum/$NAME" 2>/dev/null \
- || cat "$HOME/.gittum/default/$NAME" 2>/dev/null

dotfiles/gittum/bin/metacm

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+die() {
+    echo "$@" >&2
+    exit 2
+}
+
+mktmpl() {
+    #
+    # Make temporary template for git-commit and print its path
+    #
+    local mtmpl_name="$1"; shift
+    local mtmpl_path
+    local tmpl_path
+    mtmpl_path="$HOME/.gittum/template/$mtmpl_name"
+    test -f "$mtmpl_path" || die "no such meta-template: $mtmpl_path"
+    bash -n "$mtmpl_path" || die
+    tmpl_path="/.$(mktemp -t gittum-metacm.XXXXXXXX)"
+    bash "$mtmpl_path" "$@" > "$tmpl_path" || die "template script exited with bad state: $?"
+    printf %s "$tmpl_path"
+}
+
+main() {
+    local name="$1"; shift
+    local tmpl
+    local interactive=true
+    test -n "$1" && interactive=false
+    tmpl="$(mktmpl "$name" "$@")"
+    if $interactive;
+    then
+        git commit --verbose --template="$tmpl"
+    else
+        git commit -F "$tmpl"
+    fi
+    rm "$tmpl"
+}
+
+main "$@"

dotfiles/gittum/default/msg_bumpv

@@ -1 +0,0 @@
-Bump version

dotfiles/gittum/default/msg_flake8

@@ -1 +0,0 @@
-Flake8

dotfiles/gittum/default/msg_tmp

@@ -1,2 +0,0 @@
-
-# use this file to define temporary template

dotfiles/gittum/default/msg_typo

@@ -1 +0,0 @@
-Fix typo

dotfiles/gittum/default/msg_wip

@@ -1 +0,0 @@
-WIP

dotfiles/gittum/main.gitconfig

@@ -8,16 +8,11 @@
   blog = log --graph --oneline --pretty=tformat:'%Cred%h%Creset - %C(yellow)%s%Creset %C(green)<%an>%Creset %C(blue)@%d%Creset' --abbrev-commit
   cm = commit --verbose
   cma = commit --verbose --amend
-  cmf = !sh -c \
-        'git commit --verbose --edit --message=\"$(~/.gittum/bin/findcat msg_flake8)\"'
-  cmt = !sh -c \
-        'git commit --verbose --edit --message=\"$(~/.gittum/bin/findcat msg_tmp)\"'
-  cmr = !sh -c \
-        'git commit --verbose --edit --message=\"$(~/.gittum/bin/findcat msg_typo)\"'
-  cmv = !sh -c \
-        'git commit --verbose --edit --message=\"$(~/.gittum/bin/findcat msg_bumpv)\"'
-  cmw = !sh -c \
-        'git commit --verbose --edit --message=\"$(~/.gittum/bin/findcat msg_wip)\"'
+  cmf = !~/.gittum/bin/metacm msg_flake8
+  cmt = !~/.gittum/bin/metacm msg_tmp
+  cmr = !~/.gittum/bin/metacm msg_typo
+  cmv = !~/.gittum/bin/metacm msg_bumpv
+  cmw = !~/.gittum/bin/metacm msg_wip
   co = checkout
   com = checkout master
   cp = cherry-pick

dotfiles/gittum/template/msg_bumpv

@@ -0,0 +1,2 @@
+#!/bin/bash
+echo "Bump version"

dotfiles/gittum/template/msg_flake8

@@ -0,0 +1,2 @@
+#!/bin/bash
+echo Flake8

dotfiles/gittum/template/msg_tmp

@@ -0,0 +1,3 @@
+#!/bin/bash
+echo ""
+echo "# use this file to define temporary template"

dotfiles/gittum/template/msg_typo

@@ -0,0 +1,2 @@
+#!/bin/bash
+echo "Fix typo"

dotfiles/gittum/template/msg_wip

@@ -0,0 +1,2 @@
+#!/bin/bash
+echo "WIP $1"